IRMCS2031

Read Request

Host

FPGA

ACK (OK)

Data...

Perform read operation

Request complete

The following example shows a register write request that is repeated by the host due to a negative acknowledgement

from the IRMCK203.

Write Request

Data...

Host

FPGA

ACK (OK)

Perform write operation

Request complete

Write Request

Data...

ACK (error)

Error in processing (e.g.,

bad checksum)

resend

In the final example, the host repeats a register read access request when it receives no response to its first attempt.

Read Request

Host

FPGA

ACK (OK)

Data...

Perform read operation

Request complete

…

time out, resend

Read Request

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