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Appendix A

SPI-4.2 Lite Control Word

This appendix defines the SPI-4.2 control word format as shown in Table A-1. This table is reproduced from Table 6.2 in the OIF-SP14-02.1 specification.

Table A-1:SPI-4.2 Lite Control Word Format

Bit

Label

Description

Position

 

 

 

 

 

15

Type

Control Word Type

 

 

Set to either of the following:

 

 

1: payload control word

 

 

0: idle or training control word

 

 

 

14:13

EOPS

End-of-Packet Status

 

 

Set to one of the following values below according to the

 

 

status of the immediately preceding payload transfer

 

 

00: Not an EOP

 

 

01: EOP Abort

 

 

10: EOP Normal termination, 2 bytes valid

 

 

11: EOP Normal termination, 1 byte valid

 

 

EOPS is valid in the first control word following a burst

 

 

transfer. It is ignored and set to “00” otherwise.

 

 

 

12

SOP

Start-of-Packet

 

 

Set to “1” if the payload transfer immediately following the

 

 

control word corresponds to the start of a packet. Set to “0”

 

 

otherwise.

 

 

Set to “0” in all idle and training control words.

 

 

 

11:4

ADDRESS

Port Address

 

 

8-bit port address of the payload transfer immediately

 

 

following the control word. None of the addresses are

 

 

reserved (all 256 are available for payload transfer).

 

 

Set to zeroes in all idle control words.

 

 

Set to ones in all training control words.

 

 

 

SPI-4.2 Lite v4.3 User Guide

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UG181 June 27, 2008

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Xilinx UG181 manual SPI-4.2 Lite Control Word, Eops

UG181 specifications

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