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

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Bit Description

7 - 6

 DRAM Hole Enable
00 = none
01 = 512K-640K
10 = 15M-16M (82437FX/MX/VX only)
11 = 14M-16M (82437VX,82439TX only)

5

 reserved

4

 (82437MX only) refresh type during Suspend
0 = CAS-before-RAS refresh
1 = self-refreshing DRAMs in system

4

 (82439TX only) Enhanced Paging disabled

3

 EDO Detect Mode enable (used to detect whether memory is EDO bank-by-bank)

2 - 0

 DRAM refresh rate 
FX/VX/HX: 
000 = disabled
001 = 50 MHz
010 = 60 MHz
011 = 66 MHz
100 = reserved
101 = reserved
110 = reserved
111 = reserved

MX: 
000 = 15.6 us
001 = 31.2 us
010 = 62.4 us
011 = 125 us
100 = 250 us
101 = reserved
110 = reserved
111 = reserved

TX:
000 = disabled
001 = 15.6 us
010 = 31.2 us
011 = 64.4 us
100 = 125 us
101 = 256 us
110 = reserved
111 = reserved

See Also:

#01099,#01108,#01098,#01115,#01106