Read Transfer - STMicroelectronics SPC572L series Reference Manual

RM0400
45.7.1

Read transfer

A Read transfer can be of two types:
•
Read request transfer (at initiator node)
•
Read response transfer (at target node)
45.7.1.1 Register read request transfer
If there is a read request transfer, the initiator node will send header, address and CRC bits
as shown in
Figure 549. Read request transfer (showing LFAST frame encapsulation)
Sync
16 bits
45.7.2 Register read answer transfer
In response to a read request by the initiator node, the target node will send header, payload
and CRC16. Data transfer could be in 8-bit, 16-bit or 32-bit modes (see
case of 8-bit or 16-bit modes, copies of the SIPI data is sent in the payload (see
Figure 549.
Header Header
8 bits 16 bits
DocID027809 Rev 4
Serial Interprocessor Interface (SIPI)
Address
32 bits
64 bits
SIPI Frame
LFAST Frame
Bit Stream Direction
CRC16 End
16 bits
1 bit
Figure 550). In the
Figure 551).
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