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Bitfields for Intel 82443BX Memory Buffer Strength Control

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Bit Description

47 - 40

reserved (0)

39 - 38

strengths of MAA[13:0], WEA#, SRASA#, SCASA#
00 = 1x (at both 66 and 100 MHz)
01 = reserved
10 = 2x (at both 66 and 100 MHz)
11 = 3x (at both 66 and 100 MHz)

37 - 36

strengths of MAB[12:11,9:0], MAB[13,10], WEB#, SRASB#, SCASB#
00 = 1x (at both 66 and 100 MHz)
01 = reserved
10 = 2x (at both 66 and 100 MHz)
11 = 3x (at both 66 and 100 MHz)

35 - 34

MD[63:0] buffer strength control 2
4 DIMM FET config : strength for MD[63:0] path connected to DIMMs 2&3
3/4 DIMM non-FET config : program to same value as buffer strength control 1

33 - 32

MD[63:0] buffer strength control 1
4 DIMM FET config : strength for MD[63:0] path connected to DIMMs 0&1
3/4 DIMM non-FET config : programmable based on total load detected on all DIMM connectors
00 = 1x (at both 66 and 100 MHz)
01 = reserved
10 = 2x (at both 66 and 100 MHz)
11 = 3x (at 100 MHz only)

31 - 30

MECC[7:0] buffer strength control 2
4 DIMM FET config : strength for MECC[7:0] path connected to DIMMs 2&3
3/4 DIMM non-FET config : program to same value as buffer strength control 1

29 - 28

MECC[7:0] buffer strength control 1
4 DIMM FET config : strength for MD[63:0] path connected to DIMMs 0&1
3/4 DIMM non-FET config : programmable based on total load detected on all DIMM connectors
00 = 1x (at both 66 and 100 MHz)
01 = reserved
10 = 2x (at both 66 and 100 MHz)
11 = 3x (at 100 MHz only)

27 - 26

CSB7#/CKE5 buffer strength
00 = 1x (at both 66 and 100 MHz)
01 = reserved
10 = 2x (at both 66 and 100 MHz)
11 = 3x (at both 66 and 100 MHz)

25 - 24

CSA7#/CKE3 buffer strength
00 = 1x (at both 66 and 100 MHz)
01 = reserved
10 = 2x (at both 66 and 100 MHz)
11 = 3x (at both 66 and 100 MHz)

23 - 22

CSB6#/CKE4 buffer strength
00 = 1x (at both 66 and 100 MHz)
01 = reserved
10 = 2x (at both 66 and 100 MHz)
11 = 3x (at both 66 and 100 MHz)

21 - 20

CSA6#/CKE2 buffer strength
00 = 1x (at both 66 and 100 MHz)
01 = reserved
10 = 2x (at both 66 and 100 MHz)
11 = 3x (at both 66 and 100 MHz)

19

CSA5#/RASA5#, CSB5#/RASB5# buffer strength
0 = 1x (at both 66 and 100 MHz)
1 = 2x (at both 66 and 100 MHz)

18

CSA4#/RASA4#, CSB4#/RASB4# buffer strength
0 = 1x (at both 66 and 100 MHz)
1 = 2x (at both 66 and 100 MHz)

17

CSA3#/RASA3#, CSB3#/RASB3# buffer strength
0 = 1x (at both 66 and 100 MHz)
1 = 2x (at both 66 and 100 MHz)

16

CSA2#/RASA2#, CSB2#/RASB2# buffer strength
0 = 1x (at both 66 and 100 MHz)
1 = 2x (at both 66 and 100 MHz)

15

CSA1#/RASA1#, CSB1#/RASB1# buffer strength
0 = 1x (at both 66 and 100 MHz)
1 = 2x (at both 66 and 100 MHz)

14

CSA0#/RASA0#, CSB0#/RASB0# buffer strength
0 = 1x (at both 66 and 100 MHz)
1 = 2x (at both 66 and 100 MHz)

13 - 12

DQMA5/CASA5# buffer strength
00 = 1x (at both 66 and 100 MHz)
01 = reserved
10 = 2x (at both 66 and 100 MHz)
11 = 3x (at 66 MHz only)

11 - 10

DQMA1/CASA1# buffer strength
00 = 1x (at both 66 and 100 MHz)
01 = reserved
10 = 2x (at both 66 and 100 MHz)
11 = 3x (at both 66 and 100 MHz)

9 - 8

DQMB5/CASB5# buffer strength
00 = 1x (at both 66 and 100 MHz)
01 = reserved
10 = 2x (at both 66 and 100 MHz)
11 = 3x (at 66 MHz only)

7 - 6

DQMB1/CASB1# buffer strength
00 = 1x (at both 66 and 100 MHz)
01 = reserved
10 = 2x (at both 66 and 100 MHz)
11 = 3x (at 66 MHz only)

5 - 4

DQMA[7:6,4:2,0]/CASA[7:6,4:2,0]# buffer strength
00 = 1x (at both 66 and 100 MHz)
01 = reserved
10 = 2x (at both 66 and 100 MHz)
11 = 3x (at both 66 and 100 MHz)

3 - 2

CKE1/GCKE buffer strength
00 = 1x (at both 66 and 100 MHz)
01 = reserved
10 = 2x (at both 66 and 100 MHz)
11 = 3x (at both 66 and 100 MHz)

1 - 0

CKE0/FENA buffer strength
00 = 1x (at both 66 and 100 MHz)
01 = reserved
10 = 2x (at both 66 and 100 MHz)
11 = 3x (at both 66 and 100 MHz)

See Also:

#01142