Fujitsu MAA3182FC Series, Manual

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C141-E054-02EN 1 - 78
(3) Byte/bit alignment
The COMMAND and READ/WRITE data are transfered in the following allignment. (Figure 1.20)
byte number ; #0 #1 …… #n-1 #n
byte transfer order in ESI ; 1st 2nd n-1 th n th
V
bit ; 7 6 5 4 3 2 1 0
transfer order in ESI ;
1st nibble 2nd nibble
bit alignment ; D (3) D (2) D (1) D(0) D (3) D (2) D (1) D (0)
Figure 1.20 Byte/Bit alignment in ESI
1.11.4 READ/WRITE phase
(1) READ phase
REAd phase is a process that the drive receives the information stored by the enclosure.
The protocol is shown in Figure 1.21.
Figure 1.21 READ phase
(a) ; The drive asserts –DSK_RD and requests the data to the enclosure.
(b) ; The enclosure asserts –ENCL_ACK after enabling the data on D (0:3).
(c) ; The drive reads the data and negates –DSK_RD.
(d) ; The enclosure negates –ENCL_ACK by –DSK_RD being nagated.
(2) WRITE phase
The protocol is shown in Figure 1.19.
1.11.5 SES sense codes
Table 1.19 ASC/ASCQ defined for ESI conditions
ASC/ASCQ Definition
35h/00h Unspecified Enclosure Services Failure
35h/01h Unsupported Enclosure Function
35h/02h Enclosure Services Unavailable
35h/03h Enclosure Transfer Failure
35h/04h Enclosure Transfer Refused
min 100
µ
sec