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Bitfields for 82443BX DRAM Control

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Bit Description

7 - 6

reserved

5

module mode configuration (read-only)
0 = self-refresh entry is staggered; if "SDRAMPWR" (offset 76h bit 4) is set, 3 DIMMs are supported, CKE[5:0] is driven, and dynamic SDRAM power-down is available; if "SDRAMPWR" is clear, 4 DIMMs are supported but power-down is not available
1 = self-refresh entry is not staggered; 3 DIMMs are supported, only CKE0 is driven, and dynamic power-down is not available

4 - 3

DRAM type
00 = EDO
01 = SDRAM
10 = registered SDRAM
11 = reserved

2 - 0

DRAM refresh rate
000 = disabled
001 = 15.6 microseconds
010 = 31.2 microseconds
011 = 62.4 microseconds
100 = 124.8 microseconds
101 = 249.6 microseconds
110 = reserved
111 = reserved

See Also:

#01142