參數(shù)資料
型號: AM79C970
廠商: Advanced Micro Devices, Inc.
英文描述: PCnetTM-PCI Single-Chip Ethernet Controller for PCI Local Bus
中文描述: PCnetTM - PCI單芯片以太網(wǎng)控制器的PCI總線
文件頁數(shù): 121/168頁
文件大?。?/td> 943K
代理商: AM79C970
AMD
P R E L I M I N A R Y
1-988
Am79C970
7–0 SWSTYLE
Software Style register. The
value in this register determines
the style of I/O resources that
shall be used by the PCnet-PCI
controller. The Software Style
selection will affect the interpre-
tation of a few bits within the CSR
space and the width of the de-
scriptors and initialization block.
Specifically:
Table 12. SWSTYLE Values
SWSTYLE
[7:0]
Style
Name
CSR-
PCNET SSIZE32 Interpretations
Altered Bit
00h
LANCE/
PCnet-
ISA
1
0
ALL CSR4 bits will
function as defined in
the CSR4 section.
TMD1[29] functions as
ADD_FCS
01h
ILACC
0
1
CSR4[9:8], CSR4[5:4]
and CSR4[1:0] will
have no function, but
will be writeable and
readable.
CSR4[15:10], CSR4[7:6]
and CSR4[3:2] will
function as defined in the
CSR4 section.
TMD1[29] becomes
NO_FCS.
02h
PCnet-
PCI
1
1
ALL CSR4 bits will
function as defined in
the CSR4 section.
TMD1[29] functions as
ADD_FCS
All other
combs.
Res.
Undef.
Undef.
Undef.
All PCnet-PCI controller CSR
bits and BCR bits and all descrip-
tor, buffer and initialization block
entries not cited in the table
above are unaffected by the Soft-
ware Style selection and are
therefore always fully functional
as specified in the CSR and BCR
sections.
Read/write accessible only when
STOP bit is set.
The SWSTLYE register will con-
tain the value 00h following
H_RESET or S_RESET and will
be unaffected by STOP.
BCR21: Interrupt Control
Bit
Name
Description
31–16
RES
Reserved locations. Written as
ZEROs and read as undefined.
Reserved locations. Writes to
this register will have no effect on
the operation of the PCnet-PCI
controller.
15–0 INTCON
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