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SPI-4.2 Lite v4.3 User Guide www.xilinx.com 131
UG181 June 27, 2008
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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
Position
Label Description
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.