Fujitsu MAT3300FC 用户手册
Fibre Channel Interface
1-102
C141-C008
1.11.3 COMMAND phase
In COMMAND phase protocol, the drive transmits the command receiving from
the initiator to the enclosure.
the initiator to the enclosure.
Because the data bits are 4 bits width, the drive has to transmit the data even
times.
times.
(1) COMMAND phase
The drive communicates with the enclosure as shown in Figure 1.57.
(a)
–DSK_WR
D (0:3)
–ENCL_ACK
min 100 nsec
(c)
(b)
(d)
Figure 1.57 COMMAND, WRITE phase
(a) ; The drive asserts –DSK_WR and indicates to the enclosure that the valid
data is on D (0:3).
(b) ; The enclosure asserts –ENCL_ACK after receiving the data.
(c) ; The drive negates –DSK_WR and the data by –ENCL_ACK being
asserted.
(d) ; The enclosure negates –ENCL_ACK by –DSK_WR being negated.
(2) Definition of COMMAND bytes
If the drive acknowledges the drive should issue COMMAND to the enclosure
after receiving SCSI command, then transmits the COMMAND as shown in
Table 1.29.
after receiving SCSI command, then transmits the COMMAND as shown in
Table 1.29.
Table 1.29 COMMAND bytes definition
Byte Definition
byte 0
Page Code
byte 1
Reserved except bit 0 (data transfer direction in SEND DIAG.)
byte 2
Parameter Length high byte in SEND DIAG.
byte 3
Parameter Length low byte in SEND DIAG.