SPI Read Fuse

Reads fuses using SPI programming.

Table 1. SPI Read Fuse Command Format
Field	Size	Description
SPI_CMD_READ_FUSE	1 byte	Command ID
RetAddr	1 byte	XML: pollIndex. Return address
cmd1	1 byte	Command Byte # 1 to be transmitted
cmd2	1 byte	Command Byte # 2 to be transmitted
cmd3	1 byte	Command Byte # 3 to be transmitted
cmd4	1 byte	Command Byte # 4 to be transmitted

Note: RetAddr indicates which of the transmitted bytes on the SPI interface contains the return value, since the SPI interface is implemented as a ring buffer (one byte in, one byte out).

Response:

Table 2. SPI Read Fuse Response
Field	Size	Description
SPI_CMD_READ_FUSE	1 byte	Command ID
Status1	1 byte	SPI_STATUS_CMD_OK
Data	1 byte	Data read from the device
Status2	1 byte	SPI_STATUS_CMD_OK or SPI_STATUS_RDY_BSY_TOUT