Alif Semiconductor /AE302F40C1537LE_CM55_HE_View /OSPI0 /OSPI_XIP_CTRL

SPI Frame Format Selects data frame format for Transmitting/Receiving the data.

1 (Val_0x1): Dual SPI format

2 (Val_0x2): Quad SPI format

3 (Val_0x3): Octal SPI format

Address and Instruction Transfer format. Selects whether OSPI will transmit instruction/address either in Standard SPI mode or the SPI mode selected in the OSPI_XIP_CTRL[FRF] bit field.

0 (Val_0x0): Instruction and Address will be sent in Standard SPI Mode.

1 (Val_0x1): Instruction will be sent in Standard SPI Mode and Address will be sent in the mode specified by OSPI_XIP_CTRL[FRF] bit field.

2 (Val_0x2): Both Instruction and Address will be sent in the mode specified by OSPI_XIP_CTRL[FRF] bit field.

This bit defines Length of Address to be transmitted. Only after this much bits are programmed in to the FIFO the transfer can begin.

0 (Val_0x0): No address

1 (Val_0x1): 4-bit address length

2 (Val_0x2): 8-bit address length

3 (Val_0x3): 12-bit address length

4 (Val_0x4): 16-bit address length

5 (Val_0x5): 20-bit address length

6 (Val_0x6): 24-bit address length

7 (Val_0x7): 28-bit address length

8 (Val_0x8): 32-bit address length

9 (Val_0x9): 36-bit address length

10 (Val_0xA): 40-bit address length

11 (Val_0xB): 44-bit address length

12 (Val_0xC): 48-bit address length

13 (Val_0xD): 52-bit address length

14 (Val_0xE): 56-bit address length

15 (Val_0xF): 60-bit address length

Dual/Quad/Octal mode instruction length in bits.

0 (Val_0x0): No Instruction

1 (Val_0x1): 4-bit instruction length

2 (Val_0x2): 8-bit instruction length

3 (Val_0x3): 16-bit instruction length

Mode bits enable in XIP mode. If this bit is set to 1, then in XIP mode of operation OSPI will insert Mode bits after the address phase. These bits are set in register OSPI_XIP_MODE_BITS register. The length of Mode bits defaults to 8-bits.

Wait cycles in Dual/Quad/Octal mode between control frames transmission and data reception. Specified as number of SPI clock cycles.

Fix DFS for XIP transfers. If this bit is set to 1 then data frame size for XIP transfers is fixed to the programmed value in OSPI_CTRLR0[DFS] bit field. The number of data frames to fetch is determined by transfer size and burst type signals. If this bit is set to 0 then data frame size and number of data frames to fetch are both determined by transfer size and burst type signals.

SPI DDR Enable bit. This bit enables Dual Data-Rate transfers in Dual/Quad/Octal frame formats of SPI.

Instruction DDR Enable bit. This bit enables Dual Data-Rate transfer for instruction phase

Read Data Strobe Enable bit. Once this bit is set to 1, OSPI will use Read data strobe (RXDS) to capture read data in DDR mode.

XIP Instruction Enable bit. If this bit is set to 1 then XIP transfers will also have instruction phase. The instruction opcodes can be chosen from OSPI_XIP_INCR_INST or OSPI_XIP_WRAP_INST registers bases on AHB transfer type.

Enable Continuous Transfer in XIP mode. If this bit is set to 1 then continuous transfer mode in XIP will be enabled, in this mode OSPI will keep slave selected until a non-XIP transfer is detected on the AHB interface.

SPI Hyperbus Frame format enable for XIP transfers. Selects if data frame format for XIP transfers is in HyperBus mode.

Enable RXDS Signaling during address and command phase of HyperBus transfer. This bit enables RXDS signaling by HyperBus slave devices during Command-Address (CA) phase. If the RXDS signal is set to 1 during the CA phase of transfer, OSPI transmits [2 x OSPI_SPI_CTRLR0[WAIT_CYCLES]) - 1] wait cycles after the address phase is complete.

XIP Mode Bits Length. Sets the length of Mode bits in XIP mode of operation. These bits are valid only when OSPI_XIP_CTRL[XIP_MD_BIT_EN] is set to 1.

0 (Val_0x0): Mode bits length equal to 2.

1 (Val_0x1): Mode bits length equal to 4.

2 (Val_0x2): Mode bits length equal to 8.

3 (Val_0x3): Mode bits length equal to 16.

Enables XIP Pre-fetch functionality in OSPI. Once enabled OSPI will pre-fetch data frames from next contiguous location, to reduce the latency for the upcoming contiguous transfer. If the next XIP request is not contiguous then pre-fetched bits will be discarded.