Bitfields for Intel 82443BX Memory Buffer Strength Control: Bit(s) Description ) 47-40 reserved (0) 39-38 strengths of MAA[13:0], WEA#, SRASA#, SCASA# (settings same as below) 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 str. ctrl 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 str. ctrl 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 (values same as for MD[63:0] buffer strength) 27-26 CSB7#/CKE5 buffer strength (same values as bits 37-36) 25-24 CSA7#/CKE3 buffer strength (same values as bits 37-36) 23-22 CSB6#/CKE4 buffer strength (same values as bits 37-36) 21-20 CSA6#/CKE2 buffer strength (same values as bits 37-36) 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 (same values as bit 19) 17 CSA3#/RASA3#, CSB3#/RASB3# buffer strength (same values as bit 19) 16 CSA2#/RASA2#, CSB2#/RASB2# buffer strength (same values as bit 19) 15 CSA1#/RASA1#, CSB1#/RASB1# buffer strength (same values as bit 19) 14 CSA0#/RASA0#, CSB0#/RASB0# buffer strength (same values as bit 19) 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 (same values as bits 37-36) 9-8 DQMB5/CASB5# buffer strength (same values as bits 13-12) 7-6 DQMB1/CASB1# buffer strength (same values as bits 13-12) 5-4 DQMA[7:6,4:2,0]/CASA[7:6,4:2,0]# buffer strength (as for bits 37-36) 3-2 CKE1/GCKE buffer strength (same values as bits 37-36) 1-0 CKE0/FENA buffer strength (same values as bits 37-36) SeeAlso: #01142