ADLINK CoreExpress-ECO2 - Manual (Page 27)

4.20 Write Data to User-Flash
This command writes data to the selected address of the SMC-Flash. Up to 32 Bytes can be written
in a single block access. The number of bytes to write must be a multiple of 4. This command takes
up to 250ms of time (depends if the requested Flash-Area is clear or not). During this time the SMC
is not accessible. To detect if the SMC is busy use a single read with 0xFF as command (like Read
BIOS Flags, but use 0xFF instead of 0x35). If the SMC responds with 0xF0, the SMC is ready for next
steps.
START SMC_addr ACK command ACK length ACK Data0 ACK … ACK
Data_n ACK STOP
Table 4.20.1 SMC receiver format of the Write Data to User-Flash Command Code
ITEM DESCRIPTION
START SM-bus start condition
SMC_addr 0x50 (8-bit)
ACK SM-bus acknowledge condition generated by receiver
command 0x41 = “Write Data to User-Flash” Command code
Length Number of Data_Bytes to write (=n)
Data0..n 4-32 Data-Bytes to write
STOP SM-bus stop condition
Table 4.20.2 Explanation of Table 4.20.1