參數(shù)資料
型號(hào)： Am79C965A
廠商： Advanced Micro Devices, Inc.
英文描述： PCnet?-32 Single-Chip 32-Bit Ethernet Controller
中文描述： PCnet？-32單芯片32位以太網(wǎng)控制器
文件頁(yè)數(shù)： 110/228頁(yè)
文件大?。?/td> 1681K
代理商： AM79C965A
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110
Am79C965A
Hardware Access
PCnet-32 Controller Master Accesses
The particular signals involved in a PCnet-32 controller
bus master transfer depends upon the bus mode that
has been selected. There are two bus modes to choose
from. They are:
I
Am486 32-bit mode
I
VESA VL-Bus mode
Complete descriptions of the signals involved in bus
master transactions for each mode may be found in the
pin description section of this document. Timing dia-
grams for master accesses may be found in the block
description section for the Bus Interface Unit. This sec-
tion simply lists the types of master accesses that will
be performed by the PCnet-32 controller with respect to
data size and address information.
The PCnet-32 controller will support master accesses
only to 32-bit peripherals in Am486 environments. The
PCnet-32 controller does not support master accesses
to 16-bit peripherals in the 486 local bus mode.
The PCnet-32 controller will support master accesses
to either 32-bit or 16-bit peripherals in VESA VL-Bus
mode. Support of master accesses to 16-bit
peripherals in VESA VL-Bus mode is provided through
the LBS16 input pin.
The PCnet-32 controller is not compatible with 8-bit
systems, since there is no mode that supports
PCnet-32 controller accesses to 8-bit peripherals.
Table 35 describes all possible bus master accesses
that the PCnet-32 controller will perform. The right-
most column lists all operations that may execute the
given access.
Table 35. Master Accesses
*Cases marked with an asterisk represent extreme
boundary conditions that are the result of programming
one- and two-byte buffer sizes, and therefore will not be
seen under normal circumstances.
Note that all PCnet-32 controller master read
operations will always activate all byte enables. (Note
the exception, when LBS16 has been asserted in VL-
Bus mode, requiring a second access. In all LBS16
cases, the second access (if required) will have BE1
and BE0 disabled. Therefore, no one-, two- or three-
byte read operations are indicated in the table.
In the instance where a transmit buffer pointer address
begins on a non-double-word boundary, the pointer will
be truncated to the next double-word boundary
address that lies below the given pointer address and
the first read access from the transmit buffer will be
indicated on the byte enable signals as a four-byte read
from this address. Any data from byte lanes that lie
outside of the boundary indicated by the buffer pointer
will be discarded inside of the PCnet-32 controller.
Access
R/W
BE3
–
BE0
Possible
Instance
4-Byte Read
RD
0000
Descriptor Read or
Initialization Block
Read or
Transmit Data
Buffer Read
4-Byte Write
WR
0000
Descriptor Write or
Receive Data
Buffer Write
3-Byte Write
WR
1000
Receive Data
Buffer Write
3-Byte Write
WR
0001
Receive Data
Buffer Write
2-Byte Write
WR
1100
Receive Data
Buffer Write
2-Byte Write
WR
1001*
Receive Data
Buffer Write
2-Byte Write
WR
0011
Receive Data
Buffer Write
1-Byte Write
WR
1110
Receive Data
Buffer Write
1-Byte Write
WR
1101*
Receive Data
Buffer Write
1-Byte Write
WR
1011*
Receive Data
Buffer Write
1-Byte Write
WR
0111
Descriptor Write or
Receive Data
Buffer Write
相關(guān)PDF資料
PDF描述
AM79C970AKCW PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
AM79C970AKC PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
AM79C970A PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
AM79C970AVCW PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
AM79C970 PCnetTM-PCI Single-Chip Ethernet Controller for PCI Local Bus
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM79C965AWW WAF 制造商:Advanced Micro Devices 功能描述:
AM79C970 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnetTM-PCI Single-Chip Ethernet Controller for PCI Local Bus
AM79C970A 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
AM79C970AKC 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
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