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)： 109/168頁
文件大?。?/td> 943K
代理商： AM79C970
AMD
P R E L I M I N A R Y
1-976
Am79C970
Bus Configuration Registers
The Bus Configuration Registers (BCR) are used to pro-
gram the configuration of the bus interface and other
special features of the PCnet-PCI controller that are not
related to the IEEE 8802-3 MAC functions. The BCRs
are accessed by first setting the appropriate RAP value,
and then by performing a slave access to the BDP.
All BCR registers are 16 bits in width in WIO mode and
32 bits in width in DWIO mode. The upper 16 bits of all
BCR registers is undefined when in DWIO mode. These
bits should be written as ZEROs and should be treated
as undefined when read. The Default value given for any
BCR is the value in the register after H_RESET, and is
hexadecimal unless otherwise stated. BCR register val-
ues are unaffected by S_RESET and are unaffected by
the assertion of the STOP bit.
Note that several registers have no default value. BCR3
and BCR8-15 are reserved and have undefined values.
BCR2, BCR16, BCR17 and BCR21 are not observable
without first being programmed through the EEPROM
read operation or a user register write operation. There-
fore the only observable values for these registers are
those that have been programmed and a default value is
not applicable.
BCR0, BCR1, BCR6, BCR16, BCR17, and BCR21 are
reserved in the PCnet-PCI controller. These registers
are used by other devices in the PCnet family. Writing to
these registers have no effect on the operation of the
PCnet-PCI controller.
Writes to those registers marked as “Reserved” will
have no effect. Reads from these locations will produce
undefined values.
BCR
0
1
2
3
4
5
6
7
8–15
16
17
18
19
20
21
MNEMONIC
MSRDA
MSWRA
MC
Reserved
LNKST
LED1
LED2
LED3
Reserved
IOBASEL
IOBASEU
BSBC
EECAS
SWS
INTCON
Default
0005h
0005h
N/A*
N/A
00C0h
0084h
0088h
0090h
N/A
N/A*
N/A*
2101h
0002h
0000h
N/A*
Description
Reserved
Reserved
Miscellaneous Configuration
Reserved
Link Status Status (Default)
Receive Status (Default)
Reserved
Transmit Status (Default)
Reserved
Reserved
Reserved
Burst Size and Bus Control
EEPROM Control and Status
Software Style
Reserved
User
No
No
Yes
No
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
EEPROM
No
No
Yes
No
No
No
No
No
No
Yes
Yes
Yes
No
No
Yes
* Registers marked with an “*” have no default value, since they are not observable without first being programmed through the
EEPROM read operation or a user register write operation. Therefore, the only observable values for these registers are those
that have been programmed and a default value is not applicable.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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
AM79C970AKC\\W 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Advanced Micro Devices 功能描述:
AM79C970AKC\W 制造商:Rochester Electronics LLC 功能描述:- Bulk
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