QSPI — Quad serial peripheral interface

The QSPI peripheral provides support for communicating with an external flash memory device using SPI.

The main features for the QSPI peripheral are:

Single/dual/quad SPI input/output
6 to 96 MHz configurable clock frequency
Single-word read/write access from/to external flash
EasyDMA for block read and write transfers
Up to 48 MB/sec EasyDMA read rate
Execute in place (XIP) for executing program directly from external flash
XIP access can optionally be disabled
On-the-fly encryption and decryption, including EasyDMA and XIP

Figure 1. Block diagram

Configuring QSPI

Before any data can be transferred to or from the external flash memory, the peripheral needs to be configured.

Select the mandatory input/output pins in the following registers:
- PSEL.SCK
- PSEL.CSN
- PSEL.IO0
- PSEL.IO1
- PSEL.IO2
- PSEL.IO3
For which pins to use, see Pin assignments. Only the dedicated QSPI pins shall be used.
To ensure stable operation, set the GPIO drive strength to high drive. See the GPIO — General purpose input/output chapter for details on how to configure GPIO drive strength.
Activate the dedicated peripheral setting of the GPIO pin. See the GPIO — General purpose input/output chapter for details on how to assign pins between cores, peripherals, or subsystems.
Configure the interface towards the external flash memory using IFCONFIG0, IFCONFIG1, and ADDRCONF.
Enable the QSPI peripheral and acquire I/O pins using ENABLE.
Activate the external flash memory interface using the ACTIVATE task. The READY event will be generated when the interface has been activated and the external flash memory is ready for access.

Note:

If the IFCONFIG0 register is configured to use the quad mode, the external flash device also needs to be set in the quad mode before any data transfers can take place.

This can be done by sending custom instructions to the external flash device, as described in Sending custom instructions.

Write operation

A write operation to the external flash is configured using the WRITE.DST, WRITE.SRC, and WRITE.CNT registers. It is started using the WRITESTART task.

The READY event is generated when the transfer is complete.

The QSPI peripheral automatically takes care of splitting DMA transfers into page writes.

Read operation

A read operation from the external flash is configured using the READ.SRC, READ.DST, and READ.CNT registers. It is started using the READSTART task.

The READY event is generated when the transfer is complete.

Erase operation

Erase of pages/blocks of the external flash is configured using the ERASE.PTR and ERASE.LEN registers. It is started using the ERASESTART task.

The READY event is generated when the erase operation has been started.

In this case, the READY event will not indicate that the erase operation of the flash has been completed, but it only signals that the erase operation has been started. The actual status of the erase operation can normally be read from the external flash using a custom instruction (see Sending custom instructions).

Execute in place

Execute in place (XIP) allows the CPU to execute program code directly from the external flash.

After the external flash has been configured, the CPU can execute code from the external flash by accessing the XIP memory region. See the following figure and Memory for details.

The XIP memory region is read-only, writing to it will result in a bus error.

When accessing the XIP memory region, the start address of this XIP memory region will map to the address XIPOFFSET of the external flash.

Figure 2. XIP memory map

Encryption

The contents of an external flash memory can be protected using stream cipher encryption. Encryption can be configured and enabled independently for XIP and EasyDMA, with separate keys and nonce.

Once configured and enabled, the stream cipher operates between the AHB bus and the external flash, encrypting and decrypting data passing through.

The following figure shows the stream cipher block with the three configuration registers. The stream cipher uses an AES 128 encryption operation to form the keystream from key, nonce, and external memory address. The keystream then combines each 32-bit plaintext digit one at a time with the corresponding digit of the keystream.

Figure 3. Stream cipher

The same nonce and key must be used for both encryption and decryption of the same memory address.

The memory address used for encryption is the external flash memory address and thus independent of XIPOFFSET. This means a second firmware image can be encrypted and written using EasyDMA, then XIPOFFSET set to point to the new firmware image before executing from it.

Stream ciphers are symmetric. They do not differentiate between encrypting or decrypting, reading or writing. Thus, if the contents of a plain text external flash is read when stream cipher is enabled, the data provided to the MCU is encrypted.

Execute in place (XIP)

Enable the stream cipher for QSPI XIP by doing the following steps.

Configure keys using XIP_ENC.KEY0 through XIP_ENC.KEY3.
Configure nonce using XIP_ENC.NONCE0 through XIP_ENC.NONCE2.
Set XIP_ENC.ENABLE.

Any instructions or data read from the XIP interface will now pass through the stream cipher.

EasyDMA

Enable the stream cipher for QSPI EasyDMA by doing the following steps.

Configure keys using DMA_ENC.KEY0 through DMA_ENC.KEY3.
Configure nonce using DMA_ENC.NONCE0 through DMA_ENC.NONCE2.
Set DMA_ENC.ENABLE.

Any data read from or written to the external flash over the EasyDMA interface will now pass through the stream cipher.

Sending custom instructions

Custom instructions can be sent to the external flash using the CINSTRCONF, CINSTRDAT0, and CINSTRDAT1 registers. It is possible to send an instruction consisting of a one-byte opcode and up to 8 bytes of additional data and to read its response.

A custom instruction is prepared by first writing the data to be sent to CINSTRDAT0 and CINSTRDAT1 before writing the opcode and other configurations to the CINSTRCONF register.

The custom instruction is sent when the CINSTRCONF register is written and it is always sent on a single data line SPI interface.

The READY event will be generated when the custom instruction has been sent.

After a custom instruction has been sent, the CINSTRDAT0 and CINSTRDAT1 will contain the response bytes from the custom instruction.

The data of custom instructions is not part of the stream cipher encryption.

Figure 4. Sending custom instruction

Long frame mode

The LFEN and LFSTOP fields in the CINSTRCONF register control the operation of the custom instruction Long frame mode. Long frame mode is a mechanism that permits arbitrary byte length custom instructions. While in Long frame mode a long custom instruction sequence is split in multiple writes to the CINSTRDAT0 and CINSTRDAT1 registers.

To enable Long frame mode every write to the CINSTRCONF register must have the LFEN field set to 1. The contents of the OPCODE field will be transmitted after the first write to CINSTRCONF and will be omitted in every subsequent write to this register. For subsequent writes the number of data bytes as specified in the LENGTH field are transferred (that is the value of LENGTH - 1 data bytes). The values of the LIO2 and LIO3 fields are set in the first write to CINSTRCONF and will apply for the entire custom instruction transmission until the long frame is finalized.

To finalize a long frame transmission, the LFSTOP field in the CINSTRCONF register must be set to 1 in the last write to this register.

Deep power-down mode

The external flash memory can be put in Deep power-down mode (DPM) to minimize its current consumption when there is no need to access the memory.

DPM is enabled in register IFCONFIG0 and configured in register DPMDUR. The DPM status of the external memory can be read in the STATUS register. The DPMDUR register has to be configured according to the external flash specification to get the information in the STATUS register and the timing of the READY event correct.

Entering or exiting DPM is controlled using register IFCONFIG1.

Instruction set

The following table shows the instruction set supported by QSPI when communicating with an external flash device.

Table 1. Instruction set
Instruction	Opcode	Description
WREN	0x06	Write enable
RDSR	0x05	Read status register
WRSR	0x01	Write status register
FASTREAD	0x0B	Read bytes at higher speed
READ2O	0x3B	Dual-read output
READ2IO	0xBB	Dual-read input/output
READ4O	0x6B	Quad-read output
READ4IO	0xEB	Quad-read input/output
PP	0x02	Page program
PP2O	0xA2	Dual-page program output
PP4O	0x32	Quad-page program output
PP4IO	0x38	Quad-page program input/output
SE	0x20	Sector erase
BE	0xD8	Block erase
CE	0xC7	Chip erase
DP	0xB9	Enter Deep power-down mode
DPE	0xAB	Exit Deep power-down mode
EN4B	Specified in the ADDRCONF register	Enable 32 bit address mode

Interface description

Figure 5. 24-bit FASTREAD, SPIMODE = MODE0

Figure 6. 24-bit READ2O (dual-read output), SPIMODE = MODE0

Figure 7. 24-bit READ2IO (dual read input/output), SPIMODE = MODE0

Figure 8. 24-bit READ4O (quad-read output), SPIMODE = MODE0

Figure 9. 24-bit READ4IO (quad-read input/output), SPIMODE = MODE0

Figure 10. 24-bit PP (page program), SPIMODE = MODE0

Figure 11. 24-bit PP2O (dual-page program output), SPIMODE = MODE0

Figure 12. 24-bit PP4O (quad page program output), SPIMODE = MODE0

Figure 13. 24-bit PP4IO (quad page program input/output), SPIMODE = MODE0

Figure 14. 32-bit FASTREAD, SPIMODE = MODE0

Figure 15. 32-bit READ2O (dual-read output), SPIMODE = MODE0

Figure 16. 32-bit READ2IO (dual read input/output), SPIMODE = MODE0

Figure 17. 32-bit READ4O (quad-read output), SPIMODE = MODE0

Figure 18. 32-bit READ4IO (quad-read input/output), SPIMODE = MODE0

Figure 19. 32-bit PP (page program), SPIMODE = MODE0

Figure 20. 32-bit PP2O (dual-page program output), SPIMODE = MODE0

Figure 21. 32-bit PP4O (quad-page program output), SPIMODE = MODE0

Figure 22. 32-bit PP4IO (quad page program input/output), SPIMODE = MODE0

Registers

Table 2. Instances
Base address	Domain	Peripheral	Instance	Secure mapping	DMA security	Description	Configuration
0x5002B000 0x4002B000	APPLICATION	QSPI	QSPI : S QSPI : NS	US	SA	External memory (quad serial peripheral) interface	Supports 192 MHz and 96 MHz PCLK192M frequency

Table 3. Register overview
Register	Offset	Description
TASKS_ACTIVATE	0x000	Activate QSPI interface
TASKS_READSTART	0x004	Start transfer from external flash memory to internal RAM
TASKS_WRITESTART	0x008	Start transfer from internal RAM to external flash memory
TASKS_ERASESTART	0x00C	Start external flash memory erase operation
TASKS_DEACTIVATE	0x010	Deactivate QSPI interface
SUBSCRIBE_ACTIVATE	0x080	Subscribe configuration for task ACTIVATE
SUBSCRIBE_READSTART	0x084	Subscribe configuration for task READSTART
SUBSCRIBE_WRITESTART	0x088	Subscribe configuration for task WRITESTART
SUBSCRIBE_ERASESTART	0x08C	Subscribe configuration for task ERASESTART
SUBSCRIBE_DEACTIVATE	0x090	Subscribe configuration for task DEACTIVATE
EVENTS_READY	0x100	QSPI peripheral is ready. This event will be generated as a response to all QSPI tasks except DEACTIVATE.
PUBLISH_READY	0x180	Publish configuration for event READY
INTEN	0x300	Enable or disable interrupt
INTENSET	0x304	Enable interrupt
INTENCLR	0x308	Disable interrupt
ENABLE	0x500	Enable QSPI peripheral and acquire the pins selected in PSELn registers
READ.SRC	0x504	Flash memory source address
READ.DST	0x508	RAM destination address
READ.CNT	0x50C	Read transfer length
WRITE.DST	0x510	Flash destination address
WRITE.SRC	0x514	RAM source address
WRITE.CNT	0x518	Write transfer length
ERASE.PTR	0x51C	Start address of flash block to be erased
ERASE.LEN	0x520	Size of block to be erased.
PSEL.SCK	0x524	Pin select for serial clock SCK
PSEL.CSN	0x528	Pin select for chip select signal CSN.
PSEL.IO0	0x530	Pin select for serial data MOSI/IO0.
PSEL.IO1	0x534	Pin select for serial data MISO/IO1.
PSEL.IO2	0x538	Pin select for serial data WP/IO2.
PSEL.IO3	0x53C	Pin select for serial data HOLD/IO3.
XIPOFFSET	0x540	Address offset into the external memory for Execute in Place operation.
IFCONFIG0	0x544	Interface configuration.
XIPEN	0x54C	Enable Execute in Place operation.
XIP_ENC.KEY0	0x560	Bits 31:0 of XIP AES KEY
XIP_ENC.KEY1	0x564	Bits 63:32 of XIP AES KEY
XIP_ENC.KEY2	0x568	Bits 95:64 of XIP AES KEY
XIP_ENC.KEY3	0x56C	Bits 127:96 of XIP AES KEY
XIP_ENC.NONCE0	0x570	Bits 31:0 of XIP NONCE
XIP_ENC.NONCE1	0x574	Bits 63:32 of XIP NONCE
XIP_ENC.NONCE2	0x578	Bits 95:64 of XIP NONCE
XIP_ENC.ENABLE	0x57C	Enable stream cipher for XIP
DMA_ENC.KEY0	0x580	Bits 31:0 of DMA AES KEY
DMA_ENC.KEY1	0x584	Bits 63:32 of DMA AES KEY
DMA_ENC.KEY2	0x588	Bits 95:64 of DMA AES KEY
DMA_ENC.KEY3	0x58C	Bits 127:96 of DMA AES KEY
DMA_ENC.NONCE0	0x590	Bits 31:0 of DMA NONCE
DMA_ENC.NONCE1	0x594	Bits 63:32 of DMA NONCE
DMA_ENC.NONCE2	0x598	Bits 95:64 of DMA NONCE
DMA_ENC.ENABLE	0x59C	Enable stream cipher for EasyDMA
IFCONFIG1	0x600	Interface configuration.
STATUS	0x604	Status register.
DPMDUR	0x614	Set the duration required to enter/exit deep power-down mode (DPM).
ADDRCONF	0x624	Extended address configuration.
CINSTRCONF	0x634	Custom instruction configuration register.
CINSTRDAT0	0x638	Custom instruction data register 0.
CINSTRDAT1	0x63C	Custom instruction data register 1.
IFTIMING	0x640	SPI interface timing.

TASKS_ACTIVATE

Address offset: 0x000

Activate QSPI interface

Triggering this task activates the external flash memory interface and initiates communication with the external memory. The READY event is generated when the activation has been completed.

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID																																			A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	W	TASKS_ACTIVATE										Activate QSPI interface Triggering this task activates the external flash memory interface and initiates communication with the external memory. The READY event is generated when the activation has been completed.
			Trigger	1								Trigger task

TASKS_READSTART

Address offset: 0x004

Start transfer from external flash memory to internal RAM

The READY event will be generated when transfer is complete.

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID																																			A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	W	TASKS_READSTART										Start transfer from external flash memory to internal RAM The READY event will be generated when transfer is complete.
			Trigger	1								Trigger task

TASKS_WRITESTART

Address offset: 0x008

Start transfer from internal RAM to external flash memory

The READY event will be generated when transfer is complete.

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID																																			A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	W	TASKS_WRITESTART										Start transfer from internal RAM to external flash memory The READY event will be generated when transfer is complete.
			Trigger	1								Trigger task

TASKS_ERASESTART

Address offset: 0x00C

Start external flash memory erase operation

The READY event will be generated when the erase operation has been started. The generation of the READY event does not imply that the erase operation is completed.

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID																																			A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	W	TASKS_ERASESTART										Start external flash memory erase operation The READY event will be generated when the erase operation has been started. The generation of the READY event does not imply that the erase operation is completed.
			Trigger	1								Trigger task

TASKS_DEACTIVATE

Address offset: 0x010

Deactivate QSPI interface

This task might be needed to optimize current consumption in case there are any added current consumption when QSPI interface is activated, but idle.

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID																																			A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	W	TASKS_DEACTIVATE										Deactivate QSPI interface This task might be needed to optimize current consumption in case there are any added current consumption when QSPI interface is activated, but idle.
			Trigger	1								Trigger task

SUBSCRIBE_ACTIVATE

Address offset: 0x080

Subscribe configuration for task ACTIVATE

Triggering this task activates the external flash memory interface and initiates communication with the external memory. The READY event is generated when the activation has been completed.

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				B																								A	A	A	A	A	A	A	A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	RW	CHIDX		[255..0]								DPPI channel that task ACTIVATE will subscribe to
B	RW	EN
			Disabled	0								Disable subscription
			Enabled	1								Enable subscription

SUBSCRIBE_READSTART

Address offset: 0x084

Subscribe configuration for task READSTART

The READY event will be generated when transfer is complete.

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				B																								A	A	A	A	A	A	A	A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	RW	CHIDX		[255..0]								DPPI channel that task READSTART will subscribe to
B	RW	EN
			Disabled	0								Disable subscription
			Enabled	1								Enable subscription

SUBSCRIBE_WRITESTART

Address offset: 0x088

Subscribe configuration for task WRITESTART

The READY event will be generated when transfer is complete.

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				B																								A	A	A	A	A	A	A	A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	RW	CHIDX		[255..0]								DPPI channel that task WRITESTART will subscribe to
B	RW	EN
			Disabled	0								Disable subscription
			Enabled	1								Enable subscription

SUBSCRIBE_ERASESTART

Address offset: 0x08C

Subscribe configuration for task ERASESTART

The READY event will be generated when the erase operation has been started. The generation of the READY event does not imply that the erase operation is completed.

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				B																								A	A	A	A	A	A	A	A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	RW	CHIDX		[255..0]								DPPI channel that task ERASESTART will subscribe to
B	RW	EN
			Disabled	0								Disable subscription
			Enabled	1								Enable subscription

SUBSCRIBE_DEACTIVATE

Address offset: 0x090

Subscribe configuration for task DEACTIVATE

This task might be needed to optimize current consumption in case there are any added current consumption when QSPI interface is activated, but idle.

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				B																								A	A	A	A	A	A	A	A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	RW	CHIDX		[255..0]								DPPI channel that task DEACTIVATE will subscribe to
B	RW	EN
			Disabled	0								Disable subscription
			Enabled	1								Enable subscription

EVENTS_READY

Address offset: 0x100

QSPI peripheral is ready. This event will be generated as a response to all QSPI tasks except DEACTIVATE.

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID																																			A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	RW	EVENTS_READY										QSPI peripheral is ready. This event will be generated as a response to all QSPI tasks except DEACTIVATE.
			NotGenerated	0								Event not generated
			Generated	1								Event generated

PUBLISH_READY

Address offset: 0x180

Publish configuration for event READY

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				B																								A	A	A	A	A	A	A	A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	RW	CHIDX		[255..0]								DPPI channel that event READY will publish to.
B	RW	EN
			Disabled	0								Disable publishing
			Enabled	1								Enable publishing

INTEN

Address offset: 0x300

Enable or disable interrupt

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID																																			A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	RW	READY										Enable or disable interrupt for event READY
			Disabled	0								Disable
			Enabled	1								Enable

INTENSET

Address offset: 0x304

Enable interrupt

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID																																			A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	RW	READY										Write '1' to enable interrupt for event READY
			Set	1								Enable
			Disabled	0								Read: Disabled
			Enabled	1								Read: Enabled

INTENCLR

Address offset: 0x308

Disable interrupt

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID																																			A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	RW	READY										Write '1' to disable interrupt for event READY
			Clear	1								Disable
			Disabled	0								Read: Disabled
			Enabled	1								Read: Enabled

ENABLE

Address offset: 0x500

Enable QSPI peripheral and acquire the pins selected in PSELn registers

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID																																			A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	RW	ENABLE										Enable or disable QSPI
			Disabled	0								Disable QSPI
			Enabled	1								Enable QSPI

READ.SRC

Address offset: 0x504

Flash memory source address

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	RW	SRC										Word-aligned flash memory source address.

READ.DST

Address offset: 0x508

RAM destination address

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	RW	DST										Word-aligned RAM destination address.

READ.CNT

Address offset: 0x50C

Read transfer length

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID															A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	RW	CNT										Read transfer length in number of bytes. The length must be a multiple of 4 bytes.

WRITE.DST

Address offset: 0x510

Flash destination address

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	RW	DST										Word-aligned flash destination address.

WRITE.SRC

Address offset: 0x514

RAM source address

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	RW	SRC										Word-aligned RAM source address.

WRITE.CNT

Address offset: 0x518

Write transfer length

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID															A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	RW	CNT										Write transfer length in number of bytes. The length must be a multiple of 4 bytes.

ERASE.PTR

Address offset: 0x51C

Start address of flash block to be erased

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	RW	PTR										Word-aligned start address of block to be erased.

ERASE.LEN

Address offset: 0x520

Size of block to be erased.

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID																																		A	A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	RW	LEN										LEN
			4KB	0								Erase 4 kB block (flash command 0x20)
			64KB	1								Erase 64 kB block (flash command 0xD8)
			All	2								Erase all (flash command 0xC7)

PSEL.SCK

Address offset: 0x524

Pin select for serial clock SCK

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				C																										B	A	A	A	A	A
Reset 0xFFFFFFFF				1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1
ID	R/W	Field	Value ID	Value								Description
A	RW	PIN		[0..31]								Pin number
B	RW	PORT		[0..1]								Port number
C	RW	CONNECT										Connection
			Disconnected	1								Disconnect
			Connected	0								Connect

PSEL.CSN

Address offset: 0x528

Pin select for chip select signal CSN.

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				C																										B	A	A	A	A	A
Reset 0xFFFFFFFF				1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1
ID	R/W	Field	Value ID	Value								Description
A	RW	PIN		[0..31]								Pin number
B	RW	PORT		[0..1]								Port number
C	RW	CONNECT										Connection
			Disconnected	1								Disconnect
			Connected	0								Connect

PSEL.IO0

Address offset: 0x530

Pin select for serial data MOSI/IO0.

Serial data output (MOSI) during single mode, or serial data IO0 during quad mode

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				C																										B	A	A	A	A	A
Reset 0xFFFFFFFF				1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1
ID	R/W	Field	Value ID	Value								Description
A	RW	PIN		[0..31]								Pin number
B	RW	PORT		[0..1]								Port number
C	RW	CONNECT										Connection
			Disconnected	1								Disconnect
			Connected	0								Connect

PSEL.IO1

Address offset: 0x534

Pin select for serial data MISO/IO1.

Serial data input (MISO) during single mode, or serial data IO1 during quad mode

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				C																										B	A	A	A	A	A
Reset 0xFFFFFFFF				1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1
ID	R/W	Field	Value ID	Value								Description
A	RW	PIN		[0..31]								Pin number
B	RW	PORT		[0..1]								Port number
C	RW	CONNECT										Connection
			Disconnected	1								Disconnect
			Connected	0								Connect

PSEL.IO2

Address offset: 0x538

Pin select for serial data WP/IO2.

In single mode, this pin can control Write protect (WP, active low).

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				C																										B	A	A	A	A	A
Reset 0xFFFFFFFF				1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1
ID	R/W	Field	Value ID	Value								Description
A	RW	PIN		[0..31]								Pin number
B	RW	PORT		[0..1]								Port number
C	RW	CONNECT										Connection
			Disconnected	1								Disconnect
			Connected	0								Connect

PSEL.IO3

Address offset: 0x53C

Pin select for serial data HOLD/IO3.

In single mode, this pin can can pause the device (HOLD, active low).

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				C																										B	A	A	A	A	A
Reset 0xFFFFFFFF				1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1
ID	R/W	Field	Value ID	Value								Description
A	RW	PIN		[0..31]								Pin number
B	RW	PORT		[0..1]								Port number
C	RW	CONNECT										Connection
			Disconnected	1								Disconnect
			Connected	0								Connect

XIPOFFSET

Address offset: 0x540

Address offset into the external memory for Execute in Place operation.

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	RW	XIPOFFSET										Address offset into the external memory for Execute in Place operation. Value must be a multiple of 4.

IFCONFIG0

Address offset: 0x544

Interface configuration.

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID																							G					D	C	B	B	B	A	A	A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	RW	READOC										Configure number of data lines and opcode used for reading.
			FASTREAD	0								Single data line SPI. FAST_READ (opcode 0x0B).
			READ2O	1								Dual data line SPI. READ2O (opcode 0x3B).
			READ2IO	2								Dual data line SPI. READ2IO (opcode 0xBB).
			READ4O	3								Quad data line SPI. READ4O (opcode 0x6B).
			READ4IO	4								Quad data line SPI. READ4IO (opcode 0xEB).
B	RW	WRITEOC										Configure number of data lines and opcode used for writing.
			PP	0								Single data line SPI. PP (opcode 0x02).
			PP2O	1								Dual data line SPI. PP2O (opcode 0xA2).
			PP4O	2								Quad data line SPI. PP4O (opcode 0x32).
			PP4IO	3								Quad data line SPI. PP4IO (opcode 0x38).
C	RW	ADDRMODE										Addressing mode.
			24BIT	0								24-bit addressing.
			32BIT	1								32-bit addressing.
D	RW	DPMENABLE										Enable deep power-down mode (DPM) feature.
			Disable	0								Disable DPM feature.
			Enable	1								Enable DPM feature.
G	RW	PPSIZE										Page size for commands PP, PP2O, PP4O and PP4IO.
			256Bytes	0								256 bytes.
			512Bytes	1								512 bytes.

XIPEN

Address offset: 0x54C

Enable Execute in Place operation.

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID																																			A
Reset 0x00000001				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1
ID	R/W	Field	Value ID	Value								Description
A	RW	XIPEN										Enable XIP AHB Slave interface and access to XIP memory range When disabled, access to external memory is only available through EasyDMA and custom instructions. Access to disabled XIP interface will cause a Bus Error, and the value read is all zeros.
			Disable	0								Disable XIP interface
			Enable	1								Enable XIP interface

XIP_ENC.KEY0

Address offset: 0x560

Bits 31:0 of XIP AES KEY

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	W	KEY0										Bits 31:0 of XIP AES KEY

XIP_ENC.KEY1

Address offset: 0x564

Bits 63:32 of XIP AES KEY

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	W	KEY1										Bits 63:32 of XIP AES KEY

XIP_ENC.KEY2

Address offset: 0x568

Bits 95:64 of XIP AES KEY

Bit number				31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
ID				A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A	A
Reset 0x00000000				0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
ID	R/W	Field	Value ID	Value								Description
A	W	KEY2										Bits 95:64 of XIP AES KEY

XIP_ENC.KEY3

Address offset: 0x56C

Bits 127:96 of XIP AES KEY