Regular Data Transfer Command

This command is used for CCC transfers, private I3C/I2C SDR data transfers, and private I3C HDR transfers. The application must transfer the Write-data payload or retrieve the Read-data payload from DATA_PORT based on the type of the command (Read/Write). Single Regular Data Transfer command can be used for the payload, which can range from 0 to 65535 bytes. If the payload is more than 65535 bytes, the application must initiate Multiple Regular Data Transfer commands based on the required data length of the transfer.

The command structure of the Regular Data Transfer command is described in the following table.

Table 9-60. Regular Transfer Command Structure
Bits	Field Name	Memory Access	Reset Value	Description
63:48	DATA_LENGTH	W	0x0	Data Transfer Data Length Data Length field is used to indicate the length of the transfer in bytes. Note: This field must be set to a non-zero value, except for CCCs that do not have a defined payload.
47:32	Reserved	–	–	–
31	TOC	W	0x0	Data Transfer Terminate on Completion Controls which bus condition is issued after completion of the transfer. Values: 0x0: RESTART: Repeated Start (Sr) is issued at the end of transfer 0x1: STOP: Stop (P) is issued at end of the transfer
30	ROC	W	0x0	Data Transfer Response on Completion Controls whether Response Status is required after successful completion of the Transfer command. The successful completion is read from RESPONSE_QUEUE_PORT register. The Response Status is always sent after an unsuccessful transfer. Values: 0x0: NOT_REQUIRED: Response Status is not required 0x1: REQUIRED: Response Status is required
29	RNW	W	0x0	Data Transfer R/ W Identifies the direction of this transfer. Values: 0x0: WRITE: Write transfer 0x1: READ: Read transfer
28:26	MODE	W	0x0	Data Transfer Speed and Mode Speed and mode of the transfer. This field is used to program the speed/mode in which I3C or I2C must be initiated by the I3CC. The value of this field is decoded based on whether the transfer is targeted to I3C device or I2C device as determined by the 'DEVICE' field in the Device address table pointed by the 'DEV_INDEX' field of the command. Values: 0x0: I3C SDR0/ I2C FM I3C SDR0 represents standard SDR Speed (0 to f_{SCL Max}) 0x1: I3C SDR1 / I2C FM+ I3C SDR1 represents sustainable data rate of 8 MHz 0x2: I3C SDR2 / I2C UD (I2C SS) I3C SDR2 represents sustainable data rate of 6 MHz. I2C UD represents the user-defined standard speed I2C Speed. 0x3: I3C SDR3/ I2C Reserved I3C SDR3 represents sustainable data rate of 4 MHz. I2C UD represents the user-defined I2C Speed (currently it is Reserved). 0x4: I3C SDR4/ I2C Reserved I3C SDR4 represents sustainable data date of 2 MHz. I2C UD represents the user-defined I2C Speed (Currently it is Reserved). 0x5: Reserved (I3C HDR-TS: HDR-Ternary mode) / I2C Reserved 0x6: I3C HDR-DDR (HDR-Double Data Rate mode) / I2C Reserved 0x7: Reserved
25:20	Reserved	–	–	–
19:16	DEV_INDEX	W	0x0	Data Transfer Device Index Device Index indicates DAT table index, where information related to static and device addressing is stored. Field indicates target device addressed with the transfer.
15	CP	W	0x0	Data Transfer Command Present Command present. Indicates whether CMD field is valid for CCC or HDR transfer. Values: 0x0: TRANSFER: Describes SDR transfer. CMD field is not valid. 0x1: CCC_HDR: Describes CCC or HDR transfer. CMD field is valid.
14:7	CMD	W	0x0	Data Transfer CCC / HDR Command Code Value Transfer Command field specifies command code for CCC (8-bit) or HDR (7-bit).
6:3	TID	W	0x0	Data Transfer Transaction ID Transaction ID field is used as identification tag for the command.
2:0	CMD_ATTR	W	0x0	Data Transfer Command Attribute Command Attribute field defines Command type and bitfield format. Values: 0x0: XFER: Regular Transfer 0x1: IMMED_DATA_XFER: Immediate Data Transfer 0x2: ADDR_ASSGN_CMD: Address Assignment Command 0x3: WWR_COMBO_XFER: Write + Write/Read Combo transfer 0x7: INTERNAL_CONTROL: Internal Control command Values 0x4–0x6 are reserved.