QSPI — Quad serial peripheral interface

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

Listed here are the main features for the QSPI peripheral:

Figure 1. Block diagram

Configuring peripheral

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

  1. Select input/output pins in PSEL.SCK, PSEL.CSN, PSEL.IO0, PSEL.IO1, PSEL.IO2, and PSEL.IO3. See Reference circuitry for the recommended pins.
  2. 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.
  3. Configure the interface towards the external flash memory using IFCONFIG0, IFCONFIG1, and ADDRCONF.
  4. Enable the QSPI peripheral and acquire I/O pins using ENABLE.
  5. 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.
Important: 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 theWRITE.DST,WRITE.SRC, andWRITE.CNT registers and 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 theREAD.SRC,READ.DST, andREAD.CNTregisters and 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.PTRandERASE.LENregisters and started using the ERASESTART task.

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

Note that 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 figure below and Memory map for details.

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

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.

Figure 3. Sending custom instruction

Long frame mode

The LFEN and LFSTOP fields in the CINSTRCONF control the operation of the custom instruction long frame mode. The 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 the 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 CINSTRCONF 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 the IFCONFIG0 register and configured in the DPMDUR register. 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/exiting DPM is controlled using the IFCONFIG1 register.

Instruction set

The table below shows the instruction set being used by the QSPI peripheral 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 4. 24-bit FASTREAD, SPIMODE = MODE0

Figure 5. 24-bit READ2O (dual-read output), SPIMODE = MODE0

Figure 6. 24-bit READ2IO (dual read input/output), SPIMODE = MODE0

Figure 7. 24-bit READ4O (quad-read output), SPIMODE = MODE0

Figure 8. 24-bit READ4IO (quad-read input/output), SPIMODE = MODE0

Figure 9. 24-bit PP (page program), SPIMODE = MODE0

Figure 10. 24-bit PP2O (dual-page program output), SPIMODE = MODE0

Figure 11. 24-bit PP4O (quad page program output), SPIMODE = MODE0

Figure 12. 24-bit PP4IO (quad page program input/output), SPIMODE = MODE0

Figure 13. 32-bit FASTREAD, SPIMODE = MODE0

Figure 14. 32-bit READ2O (dual-read output), SPIMODE = MODE0

Figure 15. 32-bit READ2IO (dual read input/output), SPIMODE = MODE0

Figure 16. 32-bit READ4O (quad-read output), SPIMODE = MODE0

Figure 17. 32-bit READ4IO (quad-read input/output), SPIMODE = MODE0

Figure 18. 32-bit PP (page program), SPIMODE = MODE0

Figure 19. 32-bit PP2O (dual-page program output), SPIMODE = MODE0

Figure 20. 32-bit PP4O (quad-page program output), SPIMODE = MODE0

Figure 21. 32-bit PP4IO (quad page program input/output), SPIMODE = MODE0

Registers

Table 2. Instances
Base address Peripheral Instance Description Configuration
0x40029000 QSPI QSPI

External memory interface

   
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

 
EVENTS_READY 0x100

QSPI peripheral is ready. This event will be generated as a response to any QSPI task.

 
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 IO2.

 
PSEL.IO3 0x53C

Pin select for serial data IO3.

 
XIPOFFSET 0x540

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

 
IFCONFIG0 0x544

Interface configuration.

 
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.

 

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 RW Field Value Id Value Description
A RW

READY

   

Enable or disable interrupt for READY event

See EVENTS_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 RW Field Value Id Value Description
A RW

READY

   

Write '1' to Enable interrupt for READY event

See EVENTS_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 RW Field Value Id Value Description
A RW

READY

   

Write '1' to Disable interrupt for READY event

See EVENTS_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 RW 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 RW 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 RW 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 RW 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 RW 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 RW 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 RW 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 RW 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 RW 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 RW 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 RW 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.

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 RW 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.

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 RW 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 IO2.

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 RW 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 IO3.

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 RW 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 RW 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 RW 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.

 

IFCONFIG1

Address offset: 0x600

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 G G G   E D A A A A A A A A
Reset 0x00040480 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 0 0 0
Id RW Field Value Id Value Description
A RW

SCKDELAY

 

[0..255]

Minimum amount of time that the CSN pin must stay high before it can go low again. Value is specified in number of 16 MHz periods (62.5 ns).

D RW

DPMEN

   

Enter/exit deep power-down mode (DPM) for external flash memory.

     

Exit

0

Exit DPM.

     

Enter

1

Enter DPM.

E RW

SPIMODE

   

Select SPI mode.

     

MODE0

0

Mode 0: Data are captured on the clock rising edge and data is output on a falling edge. Base level of clock is 0 (CPOL=0, CPHA=0).

     

MODE3

1

Mode 3: Data are captured on the clock falling edge and data is output on a rising edge. Base level of clock is 1 (CPOL=1, CPHA=1).

G RW

SCKFREQ

 

[0..15]

SCK frequency is given as 32 MHz / (SCKFREQ + 1).

 

STATUS

Address offset: 0x604

Status register.

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 F F F F F F F F                                       D C
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 RW Field Value Id Value Description
C R

DPM

   

Deep power-down mode (DPM) status of external flash.

     

Disabled

0

External flash is not in DPM.

     

Enabled

1

External flash is in DPM.

D R

READY

   

Ready status.

     

READY

1

QSPI peripheral is ready. It is allowed to trigger new tasks, writing custom instructions or enter/exit DPM.

     

BUSY

0

QSPI peripheral is busy. It is not allowed to trigger any new tasks, writing custom instructions or enter/exit DPM.

F R

SREG

   

Value of external flash device Status Register. When the external flash has two bytes status register this field includes the value of the low byte.

 

DPMDUR

Address offset: 0x614

Set the duration required to enter/exit deep power-down mode (DPM).

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 B B B B B B B B B B B B B B B A A A A A A A A A A A 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 RW Field Value Id Value Description
A RW

ENTER

 

[0..0xFFFF]

Duration needed by external flash to enter DPM. Duration is given as ENTER * 256 * 62.5 ns.

B RW

EXIT

 

[0..0xFFFF]

Duration needed by external flash to exit DPM. Duration is given as EXIT * 256 * 62.5 ns.

 

ADDRCONF

Address offset: 0x624

Extended address 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         F E D D C C C C C C C C B B B B B B B B A A A A A A A A
Reset 0x000000B7 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 0 1 1 0 1 1 1
Id RW Field Value Id Value Description
A RW

OPCODE

 

[0xFF..0]

Opcode that enters the 32-bit addressing mode.

B RW

BYTE0

 

[0xFF..0]

Byte 0 following opcode.

C RW

BYTE1

 

[0xFF..0]

Byte 1 following byte 0.

D RW

MODE

   

Extended addressing mode.

     

NoInstr

0

Do not send any instruction.

     

Opcode

1

Send opcode.

     

OpByte0

2

Send opcode, byte0.

     

All

3

Send opcode, byte0, byte1.

E RW

WIPWAIT

   

Wait for write complete before sending command.

     

Disable

0

No wait.

     

Enable

1

Wait.

F RW

WREN

   

Send WREN (write enable opcode 0x06) before instruction.

     

Disable

0

Do not send WREN.

     

Enable

1

Send WREN.

 

CINSTRCONF

Address offset: 0x634

Custom instruction configuration register.

A new custom instruction is sent every time this register is written. The READY event will be generated when the custom instruction has been sent.

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                             H G F E D C B B B B A A A A A A A A
Reset 0x00002000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0
Id RW Field Value Id Value Description
A RW

OPCODE

 

[0..255]

Opcode of Custom instruction.

B RW

LENGTH

   

Length of custom instruction in number of bytes.

     

1B

1

Send opcode only.

     

2B

2

Send opcode, CINSTRDAT0.BYTE0.

     

3B

3

Send opcode, CINSTRDAT0.BYTE0 -> CINSTRDAT0.BYTE1.

     

4B

4

Send opcode, CINSTRDAT0.BYTE0 -> CINSTRDAT0.BYTE2.

     

5B

5

Send opcode, CINSTRDAT0.BYTE0 -> CINSTRDAT0.BYTE3.

     

6B

6

Send opcode, CINSTRDAT0.BYTE0 -> CINSTRDAT1.BYTE4.

     

7B

7

Send opcode, CINSTRDAT0.BYTE0 -> CINSTRDAT1.BYTE5.

     

8B

8

Send opcode, CINSTRDAT0.BYTE0 -> CINSTRDAT1.BYTE6.

     

9B

9

Send opcode, CINSTRDAT0.BYTE0 -> CINSTRDAT1.BYTE7.

C RW

LIO2

 

[0..1]

Level of the IO2 pin (if connected) during transmission of custom instruction.

D RW

LIO3

 

[0..1]

Level of the IO3 pin (if connected) during transmission of custom instruction.

E RW

WIPWAIT

   

Wait for write complete before sending command.

     

Disable

0

No wait.

     

Enable

1

Wait.

F RW

WREN

   

Send WREN (write enable opcode 0x06) before instruction.

     

Disable

0

Do not send WREN.

     

Enable

1

Send WREN.

G RW

LFEN

   

Enable long frame mode. When enabled, a custom instruction transaction has to be ended by writing the LFSTOP field.

     

Disable

0

Long frame mode disabled

     

Enable

1

Long frame mode enabled

H RW

LFSTOP

   

Stop (finalize) long frame transaction

     

Stop

1

Stop

 

CINSTRDAT0

Address offset: 0x638

Custom instruction data register 0.

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 D D D D D D D D C C C C C C C C B B B B B B B 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 RW Field Value Id Value Description
A RW

BYTE0

 

[0..0xFF]

Data byte 0

B RW

BYTE1

 

[0..0xFF]

Data byte 1

C RW

BYTE2

 

[0..0xFF]

Data byte 2

D RW

BYTE3

 

[0..0xFF]

Data byte 3

 

CINSTRDAT1

Address offset: 0x63C

Custom instruction data register 1.

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 D D D D D D D D C C C C C C C C B B B B B B B 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 RW Field Value Id Value Description
A RW

BYTE4

 

[0..0xFF]

Data byte 4

B RW

BYTE5

 

[0..0xFF]

Data byte 5

C RW

BYTE6

 

[0..0xFF]

Data byte 6

D RW

BYTE7

 

[0..0xFF]

Data byte 7

 

IFTIMING

Address offset: 0x640

SPI interface timing.

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 C C
Reset 0x00000200 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0
Id RW Field Value Id Value Description
C RW

RXDELAY

 

[7..0]

Timing related to sampling of the input serial data. The value of RXDELAY specifies the number of 64 MHz cycles (15.625 ns) delay from the the rising edge of the SPI Clock (SCK) until the input serial data is sampled. As en example, if set to 0 the input serial data is sampled on the rising edge of SCK.

 

Electrical specification

Current consumption

Symbol Description Min. Typ. Max. Units
IQSPI,IDLE

Idle current (enabled, but not activated).

µA
IQSPI,ACTIVE

Idle current (activated, but not transferring data).

µA
IQSPI,DATA

Run current (activated and transferring data to/from external Flash at 32 MHz clock frequency).

µA

Timing specification

Symbol Description Min. Typ. Max. Units
FQSPI,CLK

SCK frequency

32 MHz
DCQSPI,CLK

SCK duty cycle

%
FQSPI,XIP,16

XIP fetch frequency for 16 bit instructions.

8 MHz
FQSPI,XIP,32

XIP fetch frequency for 32 bit instructions.

4 MHz
tIO,OUT,VALID

Time from SCK falling until new data valid.

ns
tIO,OUT,INVALID

Time from SCK falling until previous data invalid.

ns

Documentation feedback | Developer Zone | Updated 2017-07-06