Seagate Ultra 160, Product Manual

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116 Parallel SCSI Interface Product Manual, Rev. A
[1] See Table 49 for the format of the SPI L_Q information unit.
[2] See Table 52 for the format of the SPI Data information unit.
[3] See Figure 18.
Figure 16. SPI information unit sequence during data type transfers
SPI L_Q
(always Targ to Init)
(logical reconnect)
DT DATA IN
(from SPI STATUS
or SPI DATA)
DT DATA OUT
(from SPI COMMAND
or SPI DATA)
DT DATA IN
DT DATA OUT
or
DT DATA IN
RESELECTION
SPI DATA
DT DATA IN
to SPI L_Q/STATUS [3]
MESSAGE IN
MESSAGE OUT
BUS FREE
(physical
disconnect)
(logical disconnect)
Attention
Condition
(data pointer restored)
(data pointer saved)
[1]
[2]