Realtek RTL8169 Manual page 76

CLK
FRAMEB
REQ64B
AD31-0
AD63-32
C/BE3-0B
C/BE7-4B
IRDYB
TRDYB
DEVSELB
ACK64B
Memory Read below 4GB (32-bit address, 32-bit data transfer granted; 64-bit slot)
2002/03/27
1 2 3
ADDRESS
BUS CMD
BE7-4B
4 5 6
DATA-1 DATA-2
BE3-0B
76
RTL8169
7 8 9
DATA-3
Rev.1.21