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2.2.2
Caching Parameters
The IDD supports the MODE SELECT parameters (caching parameters: page code = 8) shown
in Fig. 2.5 for controlling the cache feature. See item 3.1.5 concerning details of the MODE
SELECT parameters.
[Caching Parameters (Page Code = 8)]
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
1
0
0
1
0
0
0
0
Variable
0
0
0
0
0
1
0
1
3
X‘00’ (Reserved)
4-5
Prefetch-suppressed block count
Default
X‘FFFF’
Variable
X‘0000’
6-7
Minimum prefetch
Default
X‘0000’
Variable
X‘FFFF’
8-9
Maximum prefetch
Default
X‘00xx’
Variable
X‘0000’
10-11
Maximum prefetch
limit block count
Default
X‘FFFF’
Variable
X‘0000’
12
FSW
(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‘04’
Variable
X‘1F’
14-15
X‘0000’ (cache segment size)
16
X‘00’ (Reserved)
17-19
X‘000000’ (Reserved)
Remark:
The variable column indicates whether the parameter can be changed or not (if "1", the
parameter can be changed).
Figure 2.5
Cache Control Parameters
(1 cache
segment
