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Bitfields for Intel 82437,82439HX/TX cache control register

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Bit Description

7 - 6

secondary cache size
00 = none
01 = 256K
10 = 512K
11 = reserved

5 - 4

L2 RAM type
00 = pipelined burst SRAM/DRAM
01 = reserved
10 = asynchronous SRAM (82437FX/MX/VX,82439TX only)
11 = two banks of pipelined burst cache

3

NA disable
1 = never assert NA# pin

2

reserved (82437FX/MX/VX,82439TX)

2

Extended Cacheability Enable (82439HX)
0 = cache only first 64M
1 = cache up to 512M

1

Secondary Cache Force Miss or Invalidate
1 = force all memory accesses to bypass L2 cache

0

First Level Cache Enable
1 = all memory accesses made non-cacheable by CPU L1 cache

See Also:

#01099,#01108,#01098,#01110,#01113,#01114,#01106