Side BPinSide A
DescriptionNameNameDescription
-12 volt power-12 V1TRST#Test Reset (JTAG1)
Test Clock (JTAG2)TCK2+12 V+12 volt power
GroundGND3TMSTest Mode Select (JTAG5)
Test Data OutputTDO4TDITest Data Input (JTAG3)
+ 5 volt power+55+5+ 5 volt power
+56INTA#Interrupt A
Interrupt BINTB#7INTC#Interrupt C
Interrupt DINTD#8+5+ 5 volt power
Pulled low to indicate 7.5 or 25 W power requiredPRSNT1#9RSVDReserved
ReservedRSVD10I/O PWR+V I/O (+5 V or +3.3 V)
Pulled low to indicate 7.5 or 15 W power requiredPRSNT2#11RSVDReserved
GroundGND12GNDGround
GND13GND
ReservedRSVD14+3.3 V aux+3.3 volt power aux
GroundGND15RST#Bus reset
33/66 MHz clockCLK16I/O PWR+V I/O (+5 V or +3.3 V)
GroundGND17GNT#Bus grant from motherboard to card
Bus request from card to motherboardREQ#18GNDGround
+V I/O (+5 V or +3.3 V)I/O PWR19PME#Power management event (optional) 3.3 V
Address/Data bus 31 (upper half)AD[31]20AD[30]Address/Data bus 30 (upper half)
Address/Data bus 29 (upper half)AD[29]21+3.3 V+3.3 volt power
GroundGND22AD[28]Address/Data bus 28 (upper half)
Address/Data bus 27 (upper half)AD[27]23AD[26]Address/Data bus 26 (upper half)
Address/Data bus 25 (upper half)AD[25]24GNDGround
+3.3 volt power+3.3 V25AD[24]Address/Data bus 24 (upper half)
Command, Byte Enable 3C/BE[3]#26IDSELInitialization Device Select
Address/Data bus 23 (upper half)AD[23]27+3.3 V+3.3 volt power
GroundGND28AD[22]Address/Data bus 22 (upper half)
Address/Data bus 21 (upper half)AD[21]29AD[20]Address/Data bus 20 (upper half)
Address/Data bus 19 (upper half)AD[19]30GNDGround
+3.3 volt power+3.3 V31AD[18]Address/Data bus 18 (upper half)
Address/Data bus 17 (upper half)AD[17]32AD[16]Address/Data bus 16 (upper half)
Command, Byte Enable 2C/BE[2]#33+3.3 V+3.3 volt power
GroundGND34FRAME#Bus transfer in progress
Initiator readyIRDY#35GNDGround
+3.3 volt power+3.3 V36TRDY#Target Ready
Device selectedDEVSEL#37GNDGround
GroundGND38STOP#Target requests halt (Stop Transfer Cycle)
Locked transactionLOCK#39+3.3 V+3.3 volt power
Parity errorPERR#40SMBCLK /SDONESMBus clock or Snoop done (obsolete)
+3.3 volt power+3.3 V41SMBDAT /SBO#SMBus data or Snoop backoff (obsolete)
System ErrorSERR#42GNDGround
+3.3 volt power+3.3 V43PARParity
Command, Byte Enable 1C/BE[2]#44AD[15]Address/Data bus 15 (lower half)
Address/Data bus 14 (lower half)AD[14]45+3.3 V+3.3 volt power
GroundGND46AD[13]Address/Data bus 13 (lower half)
Address/Data bus 12 (lower half)AD[12]47AD[11]Address/Data bus 11 (lower half)
Address/Data bus 10 (lower half)AD[10]48GNDGround
GroundGND M66EN*49AD[09]Address/Data bus 9 (lower half)
Key notch for 5 V-capable cardsGND50GNDKey notch for 5 V-capable cards
GND51GND
Address/Data bus 8 (lower half)AD[08]52C/BE[0]#Command, Byte Enable 0
Address/Data bus 7 (lower half)AD[07]53+3.3 V+3.3 volt power
+3.3 volt power+3.3 V54AD[06]Address/Data bus 6 (lower half)
Address/Data bus 5 (lower half)AD[05]55AD[04]Address/Data bus 4 (lower half)
Address/Data bus 3 (lower half)AD[03]56GNDGround
GroundGND57AD[02]Address/Data bus 2 (lower half)
Address/Data bus 1 (lower half)AD[01]58AD[00]Address/Data bus 0 (lower half)
+V I/O (+5 V or +3.3 V)I/O PWR59I/O PWR+V I/O (+5 V or +3.3 V)
Acknowledge 64-bit; no connect for 32-bit devicesACK64#60REQ64#Request 64-bit; no connect for 32-bit devices
+ 5 volt power+561+5+ 5 volt power
+562+5
 
ReservedRSVD63GNDGround
GroundGND64C/BE[7]#Command, Byte Enable 7
Command, Byte Enable 6C/BE[6]#65C/BE[5]#Command, Byte Enable 5
Command, Byte Enable 4C/BE[4]#66I/O PWR+V I/O (+5 V or +3.3 V)
GroundGND67PAR64Parity 64 bit
Address/Data bus 63AD[63]68AD[62]Address/Data bus 62
Address/Data bus 61AD[61]69GNDGround
+V I/O (+5 V or +3.3 V)I/O PWR70AD[60]Address/Data bus 60
Address/Data bus 59AD[59]71AD[58]Address/Data bus 58
Address/Data bus 57AD[57]72GNDGround
GroundGND73AD[56]Address/Data bus 56
Address/Data bus 55AD[55]74AD[54]Address/Data bus 54
Address/Data bus 53AD[53]75I/O PWR+V I/O (+5 V or +3.3 V)
GroundGND76AD[52]Address/Data bus 52
Address/Data bus 51AD[51]77AD[50]Address/Data bus 50
Address/Data bus 49AD[49]78GNDGround
+V I/O (+5 V or +3.3 V)I/O PWR79AD[48]Address/Data bus 48
Address/Data bus 47AD[47]80AD[46]Address/Data bus 46
Address/Data bus 45AD[45]81GNDGround
GroundGND82AD[44]Address/Data bus 44
Address/Data bus 43AD[43]83AD[42]Address/Data bus 42
Address/Data bus 41AD[41]84I/O PWR+V I/O (+5 V or +3.3 V)
GroundGND85AD[40]Address/Data bus 40
Address/Data bus 39AD[39]86AD[38]Address/Data bus 38
Address/Data bus 37AD[37]87GNDGround
+V I/O (+5 V or +3.3 V)I/O PWR88AD[36]Address/Data bus 36
Address/Data bus 35AD[35]89AD[34]Address/Data bus 34
Address/Data bus 33AD[33]90GNDGround
GroundGND91AD[32]Address/Data bus 32
ReservedRSVD92RSVDReserved
RSVD93GNDGround
GroundGND94RSVDReserved