AM79C976 Advanced Micro Devices, AM79C976 Datasheet - Page 213

• Manufacturer Part Number: AM79C976
• Description: PCnet-PRO 10/100 Mbps PCI Ethernet Controller
• Manufacturer: Advanced Micro Devices

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SWSTYLE Software Style register. The val-
The value of the SSIZE32 bit has
no effect on the drive of the upper
8 address bits. The upper 8 ad-
dress pins are always driven, re-
gardless of the state of the
SSIZE32 bit.
Note that the setting of the
SSIZE32 bit has no effect on the
defined width for I/O resources.
I/O resource width is determined
by the state of the DWIO bit
(BCR18, bit 7).
ue in this register determines the
style of register and memory re-
sources that shall be used by the
Am79C976 controller. The Soft-
ware Style selection will affect the
P R E L I M I N A R Y
Am79C976
All Am79C976 controller CSR
bits and all descriptor, buffer, and
initialization block entries not cit-
ed in the Table 92 are unaffected
by the Software Style selection
and are, therefore, always fully
functional as specified in the CSR
and BCR sections.
Read/Write accessible. The SW-
STYLE register will contain the
value 00h following H_RESET
and
S_RESET or STOP.
interpretation of a few bits within
the CSR space, the order of the
descriptor entries and the width
of the descriptors and initializa-
tion block entries.
will
be
unaffected
213
by