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AM79C971VCW 数据表(PDF) 186 Page - Advanced Micro Devices

部件名 AM79C971VCW
功能描述  PCnet??FAST Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus
PDF  265 Pages
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制造商  AMD [Advanced Micro Devices]
网页  http://www.amd.com
标志 AMD - Advanced Micro Devices

AM79C971VCW 数据表(HTML) 186 Page - Advanced Micro Devices

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186
Am79C971
P R E L I M INARY
RMD3
Bit
Name
Description
31-0
US
User Space. Reserved for user
defined space.
Transmit Descriptors
When SWSTYLE (BCR20, bits 7-0) is set to 0, the soft-
ware structures are defined to be 16 bits wide, and
transmit descriptors look like Table 49 (CXDA = Current
Transmit Descriptor Address).
When SWSTYLE (BCR 20, bits 7-0) is set to 2, the soft-
ware structures are defined to be 32 bits wide, and
transmit descriptors look like Table 50 (CXDA = Current
Transmit Descriptor Address).
When SWSTYLE (BCR 20, bits 7-0) is set to 3, then the
software structures are defined to be 32 bits wide, and
transmit descriptors look like Table 51 (CXDA = Current
Transmit Descriptor Address).
TMD0
Bit
Name
Description
31-0
TBADR
Transmit Buffer address. This
field contains the address of the
transmit buffer that is associated
with this descriptor.
Table 49.
Transmit Descriptor (SWSTYLE = 0)
Address
15
14
13
12
11
10
9
8
7-0
CXDA+00h
TBADR[15:0]
CXDA+02h
OWN
ERR
ADD_
FCS
MORE/
LTINT
ONE
DEF
STP
ENP
TBADR[23:16]
CXDA+04h
1
1
1
1
BCNT
CXDA+06h
BUFF
UFLO
EX
DEF
LCOL
LCAR
RTRY
TDR
Table 50.
Transmit Descriptor (SWSTYLE = 2)
Address
31
30
29
28
27
26
25
24
23
22-16
15-12
11-4
3-0
CXDA+00h
TBADR[31:0]
CXDA+04h
OWN
ERR
ADD_
FCS
MORE/
LTINT
ONE
DEF
STP
ENP
BPE
RES
1111
BCNT
CXDA+08h
BUFF
UFLO
EX
DEF
LCOL
LCAR
RTRY
RES
RES
RES
RES
RES
RES
TRC
CXDA+0Ch
USER SPACE
Table 51.
Transmit Descriptor (SWSTYLE = 3)
Address
31
30
29
28
27
26
25
24
23
22-16
15-12
11-4
3-0
CXDA+00h
BUFF
UFLO
EX
DEF
LCOL
LCAR
RTRY
RES
RES
TRC
CXDA+04h
OWN
ERR
ADD_
FCS
MORE/
LTINT
ONE
DEF
STP
ENP
BPE
RES
1111
BCNT
CXDA+08h
TBADR[31:0]
CXDA+0Ch
USER SPACE



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