ECE1200 datasheet(22/87 Pages) MICROCHIP

22 / 87 page

ECE1200

DS00003093C Draft-page 22

 2018-2021 Microchip Technology Inc.

4.5.2

SYNC FIELD HANDLING

The SYNC field in an LPC transfer provides status for each byte transferred. The LPC Interface recognizes only the

following SYNC encodings:

4.5.2.1

Wait SYNCs on LPC

Both Long Wait and Short Wait SYNC responses are handled identically, expecting either the Ready or Error SYNC

code to appear. The ECE1200 device does not impose a time-out, leaving that to the Host Chipset.

4.5.2.2

Unclaimed LPC Cycle

An unclaimed LPC cycle is detected if no recognized SYNC code is seen after 3 clocks, or if an unrecognized SYNC

code is detected after Wait SYNCs. This will terminate the current byte by the ABORT mechanism, and all subsequent

byte transfers from the same eSPI transfer will be abandoned. The result reported over eSPI will be determined based

on the type of eSPI transfer:

Non-Posted (I/O Read, I/O Write or Memory Read):

UNSUCCESSFUL COMPLETION, and other reporting as programmed in the Unclaimed Non-Posted Error Handling

Posted (Memory Write only):

as programmed in the Unclaimed Posted Error Handling Register, Section 6.9.8, on page 42.

UNSUCCESSFUL COMPLETION is not a possible response to a Posted transfer.

See Section 4.8, "Error Reporting and Logging Registers," on page 24 for details of error posting and logging within the

ECE1200.

4.5.2.3

Error (Abort) SYNC

An LPC cycle that is claimed, but is then terminated by the Error SYNC code, will terminate the current byte, and all

subsequent byte transfers from the same eSPI transfer. The result reported over eSPI will be determined based on the

type of eSPI transfer:

Non-Posted (I/O Read, I/O Write or Memory Read):

UNSUCCESSFUL COMPLETION, and other reporting as programmed in the Sync Abort Non-Posted Error Handling

Posted (Memory Write only):

as programmed in the Sync Abort Posted Error Handling Register, Section 6.9.9, on page 42.

UNSUCCESSFUL COMPLETION is not a possible response to a Posted transfer.

See Section 4.8, "Error Reporting and Logging Registers," on page 24 for details of error posting and logging within the

ECE1200.

TABLE 4-3:

SYNC FIELD ENCODINGS RECOGNIZED

SYNC Code

Interpretation

0000

Ready

0101

Short Wait

0110

Long Wait

1010

Error

other

Unrecognized, considered Reserved

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