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Parameter Data Formats
4 - 22 C141-E167
Bit
Byte
76543210
0 00001000
1 X‘0A’ or X‘12’ (Page Length)
2 IC ABPF CAP DISC SIZE WCE MS RCD
Default00010100
Variable10000101
3 Demand Read Retention Priority Write Retention Priority
Default00000000
Variable00000000
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)
Default10000000
Variable00000000
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 4.6 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.