Fujitsu 80, Scsi Logical Interface Specifications

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Parameter Data Formats
4-22 C141-C010
Bit
Byte 7 6 5 4 3 2 1 0
0 0 0 0 0 1 0 0 0
1 X‘0A’ or X‘12’ (Page Length)
2 IC ABPF CAP DISC SIZE WCE MS RCD
Default 0 0 0 1 0 1 0 0
Variable 1 0 0 0 0 1 0 1
3 Demand Read Retention Priority Write Retention Priority
Default 0 0 0 0 0 0 0 0
Variable 0 0 0 0 0 0 0 0
4-5 Pre-fetch inhibit block count
Default X‘FFFF’
Variable X‘0000’
6-7 Minimum pre-fetch
Default X‘0000’
Variable X‘0000’
8-9 Maximum pre-fetch
Default X‘0000’
Variable X‘0000’
10-11 Maximum pre-fetch limit block count
Default X‘FFFF’
Variable X‘0000’
12 FSW LBCSS DRA VS VS (Reserved)
Default 1 0 0 0 0 0 0 0
Variable 0 0 0 0 0 0 0 0
13 Cache Segment Count
Default X‘08’
Variable X‘3F’
14-15 Cache Segment Size
Default X‘0000’
Variable X‘0000’
16 X‘00’ (Reserved)
17-19 Non Cache Segment Size
Default X‘000000’
Variable X‘000000’
Figure 4.7 MODE SELECT parameters: caching parameters
The parameters defined in this page descriptor control the range of look-ahead data in the Look-Ahead
cache feature and enable or disable the caching operation. See Section 2.2, "Look-Ahead Cache
Feature" and Section 2.3, "Write Cache" concerning details of the Look-Ahead cache feature and
parameter setting methods.