Sony LIB-D81 Product Description Manual page 53

Code
00h MODIFY DATA POINTER
01h SYNCHRONUS DATA TRANSFER REQUEST
02h Reserved
03h WIDE DATA TRANSFER REQUEST
04h PARALLEL PROTOCOL REQUEST
05-ffh Reserved
Table 7.2.1.3 : Extended Message Code
MODIFY DATA POINTER: Not supported.
SYNCHRONOUS DATA TRANSFER REQUEST determines the format of
the parameter for synchronous data transfers. The values are shown in the
following table.
Bit 7 6
Byte
0
1
2
3
4
Table 7.2.1.4 : SYNCHRONOUS DATA TRANSFER REQUEST Message Format
TRANSFER PERIOD FACTOR determines the transfer speed of synchronous
transfers. The values are as shown in the following table.
Code
00-08h Reserved
09h Transfer Period = 12.5ns (FAST-80)
0Ah Transfer Period = 25ns (FAST-40)
0Bh Transfer Period = 30.3ns (FAST-40)
0Ch Transfer Period = 50ns (FAST-20)
0D-18h Transfer Period = Transfer factor * 4ns (FAST-20)
19-31h Transfer Period = Transfer factor * 4ns (FAST-10)
32-ffh Transfer Period = Transfer factor * 4ns (FAST-5)
Table 7.2.1.5 : Transfer Period Factor Code
REQ/ACK Offset is set to the maximum offset in synchronous transfers.
When REQ/ACK Offset is 0 transfers are asynchronous.
Extended Message
5 4 3
Extended Message(01h)
Extended Message Length(03h)
SYNCHROUS DATA POINTER(01h)
TRANSFER PERIOD FACTOR
REQ/ACK Offset
Description
2 1 0
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Chapter 7 SCSI Interface