82596DX Datasheet, PDF (56/77 Pages) Intel Corporation – HIGH-PERFORMANCE 32-BIT LOCAL AREA NETWORK COPROCESSOR

82596DX SX
31
ODD WORD
16 15
EVEN WORD
0
EL S X X X X X X X X X X X X X X C B OK 0 STATUS BITS 0 0 0 0 0 0 0
A15
RBD OFFSET
A0 A15
LINK OFFSET
A0 4
4th byte
DESTINATION ADDRESS
1st byte 8
SOURCE ADDRESS
1st byte 6th byte
12
6th byte
4th byte
16
XXXXXXXXXXXXXXXX
LENGTH FIELD
20
Figure 40 Receive Frame Descriptor 82586 Mode
31
ODD WORD
16 15
EVEN WORD
EL S 0 0 0 0 0 0 0 0 0 0 SF 0 0 0 C B OK
STATUS BITS
A15
RBD OFFSET
A0 A15
LINK OFFSET
00
SIZE
EOF F
ACTUAL COUNT
4th byte
DESTINATION ADDRESS
SOURCE ADDRESS
1st byte 6th byte
6th byte
4th byte
LENGTH FIELD
OPTIONAL DATA AREA
Figure 41 Receive Frame Descriptor 32-Bit Segmented Mode
0
0
A0 4
8
1st byte 12
16
20
24
31
ODD WORD
16 15
EVEN WORD
EL S 0 0 0 0 0 0 0 0 0 0 SF 0 0 0 C B OK
STATUS BITS
A31
LINK ADDRESS
A31
RECEIVE BUFFER DESCRIPTOR ADDRESS
00
SIZE
EOF F
ACTUAL COUNT
4th byte
DESTINATION ADDRESS
SOURCE ADDRESS
1st byte 6th byte
6th byte
4th byte
LENGTH FIELD
OPTIONAL DATA AREA
Figure 42 Receive Frame Descriptor Linear Mode
0
0
A0 4
A0 8
12
1st byte 16
20
24
28
56