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參數(shù)資料
| 型號(hào)： | AM79C971 |
| 廠(chǎng)商： | Advanced Micro Devices, Inc. |
| 英文描述： | PCnet⑩-FAST Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus |
| 中文描述： | PCnet⑩快速單芯片全雙工10/100 Mbps以太網(wǎng)控制器，PCI總線(xiàn) |
| 文件頁(yè)數(shù)： | 103/265頁(yè) |
| 文件大?。?/td> | 3190K |
| 代理商： | AM79C971 |
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Am79C971
103
Table 19.
PCI Configuration Space Layout
I/O Resources
The Am79C971 controller requires 32 bytes of address
space for access to all the various internal registers as
well as to some setup information stored in an external
serial EEPROM. A software reset port is available, too.
The Am79C971 controller supports mapping the ad-
dress space to both I/O and memory space. The value
in the PCI I/O Base Address register determines the
start address of the I/O address space. The register is
typically programmed by the PCI configuration utility
after system power-up. The PCI configuration utility
must also set the IOEN bit in the PCI Command regis-
ter to enable I/O accesses to the Am79C971 controller.
For memory mapped I/O access, the PCI Memory
Mapped I/O Base Address register controls the start
address of the memory space. The MEMEN bit in the
PCI Command register must also be set to enable the
mode. Both base address registers can be active at the
same time.
The Am79C971 controller supports two modes for ac-
cessing the I/O resources. For backwards compatibility
with AMD
’
s 16-bit Ethernet controllers, Word I/O is the
default mode after power up. The device can be config-
ured to DWord I/O mode by software.
I/O Registers
The Am79C971 controller registers are divided into two
groups. The Control and Status Registers (CSR) are
used to configure the Ethernet MAC engine and to ob-
tain status information. The Bus Control Registers
(BCR) are used to configure the bus interface unit and
the LEDs. Both sets of registers are accessed using in-
direct addressing.
The CSR and BCR share a common Register Address
Port (RAP). There are, however, separate data ports.
The Register Data Port (RDP) is used to access a
CSR. The BCR Data Port (BDP) is used to access a
BCR.
In order to access a particular CSR location, the RAP
should first be written with the appropriate CSR ad-
dress. The RDP will then point to the selected CSR. A
read of the RDP will yield the selected CSR data. A
write to the RDP will write to the selected CSR. In order
to access a particular BCR location, the RAP should
first be written with the appropriate BCR address. The
BDP will then point to the selected BCR. A read of the
BDP will yield the selected BCR data. A write to the
BDP will write to the selected BCR.
Once the RAP has been written with a value, the RAP
value remains unchanged until another RAP write oc-
curs, or until an H_RESET or S_RESET occurs. RAP
is cleared to all 0s when an H_RESET or S_RESET oc-
curs. RAP is unaffected by setting the STOP bit.
Address PROM Space
The Am79C971 controller allows for connection of a
serial EEPROM. The first 16 bytes of the EEPROM will
be automatically loaded into the Address PROM
(APROM) space after H_RESET. The Address PROM
space is a convenient place to store the value of the 48-
31 24
23 16
15 8
7 0
Offset
00h
04h
08h
0Ch
10h
14h
18h
1Ch
20h
24h
28h
2Ch
30h
34h
38h
3Ch
40h
.
.
FCh
Device ID
Status
Vendor ID
Command
Base-Class
Reserved
Sub-Class
Header Type
Programming IF
Latency Timer
Revision ID
Reserved
I/O Base Address
Memory Mapped I/O Base Address
Reserved
Reserved
Reserved
Reserved
Reserved
Subsystem ID
Subsystem Vendor ID
Expansion ROM Base Address
Reserved
Reserved
MIN_GNT
Reserved
MAX_LAT
Interrupt Pin
Interrupt Line
Reserved
Reserved
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AM79C971KCW | IC LOGIC 16211 24-BIT FET BUS SWITCH -40+85C TSSOP-56 35/TUBE |
| AM79C972BKCW | PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
| AM79C972BKIW | PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
| AM79C972BVCW | PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
| AM79C972 | PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AM79C971AKC | 制造商:Advanced Micro Devices 功能描述: |
| AM79C971AVC | 制造商:Advanced Micro Devices 功能描述:10/100 MBPS ETHERNET - Trays |
| AM79C971AVC\\W | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AM79C971AVC\W | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AM79C971AWW WAF | 制造商:Advanced Micro Devices 功能描述: |
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