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| 型號(hào)： | AM79C978 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | Single-Chip 1/10 Mbps PCI Home Networking Controller |
| 中文描述： | 單芯片的1 / 10 Mbps的家庭網(wǎng)絡(luò)控制器的PCI |
| 文件頁(yè)數(shù)： | 155/261頁(yè) |
| 文件大?。?/td> | 3803K |
| 代理商： | AM79C978 |
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Am79C978
155
register when there is receive ac-
tivity on the network.
This bit is always read/write ac-
cessible. RCVE is cleared by
H_RESET and is not affected by
S_RESET or setting the STOP
bit.
1
SPEED
Speed. When this bit is set to 1,
the device is operating in HIGH
speed mode.
0
COLE
Collision Status Enable. When
this bit is set, a value of 1 is
passed to the LEDOUT bit in this
register when there is collision
activity on the network.
This bit is always read/write ac-
cessible. COLE is cleared by
H_RESET and is not affected by
S_RESET or setting the STOP
bit.
BCR9: Full-Duplex Control
Note:
Bits 15-0 in this register are programmable
through the EEPROM.
Bit
Name
Description
31-3
RES
Reserved locations. Written as
zeros and read as undefined.
2
FDRPAD
Full-Duplex Runt Packet Accept
Disable. When FDRPAD is set to
1 and full-duplex mode is en-
abled, the Am79C978 controller
will only receive frames that meet
the minimum Ethernet frame
length of 64 bytes. Receive DMA
will not start until at least 64 bytes
or a complete frame have been
received. By default, FDRPAD is
cleared to 0. The Am79C978 con-
troller will accept any length
frame and receive DMA will start
according to the programming of
the receive FIFO watermark.
Note that there should not be any
runt packets in a full-duplex net-
work, since the main cause for
runt packets is a network collision
and there are no collisions in a
full-duplex network.
This bit is always read/write ac-
cessible. FDRPAD is cleared by
H_RESET and is not affected by
S_RESET or by setting the STOP
bit.
1
RES
Reserved locations. Written as
zeros and read as undefined.
0
FDEN
Full-Duplex Enable. FDEN con-
trols whether full-duplex opera-
tion is enabled. When FDEN is
cleared and the Auto-Negotiation
is disabled, full-duplex operation
is
not
enabled
Am79C978 controller will always
operate in half-duplex mode.
When
FDEN
Am79C978 controller will operate
in full-duplex mode.
Do not set
this bit when Auto-Negotiation
is enabled
.
and
the
is
set,
the
This bit is always read/write ac-
cessible. FDEN is reset to 0 by
H_RESET, and is unaffected by
S_RESET and the STOP bit.
BCR16: I/O Base Address Lower
Bit
Name
Description
31-16 RES
Reserved locations. Written as
zeros and read as undefined.
15-5
IOBASEL
Reserved
H_RESET, the value of these bits
will be undefined. The settings of
these bits will have no effect on
any Am79C978 controller func-
tion.
locations.
After
These bits are always read/write
accessible. IOBASEL is not af-
fected by S_RESET or STOP.
4-0
RES
Reserved locations. Written as
zeros, read as undefined.
BCR17: I/O Base Address Upper
Bit
Name
Description
31-16 RES
Reserved locations. Written as
zeros and read as undefined.
15-0
IOBASEU
Reserved
H_RESET, the value in this regis-
ter will be undefined. The settings
of this register will have no effect
on any Am79C978 controller
function.
locations.
After
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| AM79C981 | Integrated Multiport Repeater Plus⑩ (IMR+⑩) |
| AM79C981JC | Integrated Multiport Repeater Plus⑩ (IMR+⑩) |
| AM79C982 | basic Integrated Multiport Repeater (bIMR) |
| AM79C982-4JC | basic Integrated Multiport Repeater (bIMR) |
| AM79C982-8JC | basic Integrated Multiport Repeater (bIMR) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AM79C978A | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Single-Chip 1/10 Mbps PCI Home Networking Controller |
| AM79C978AKC\\W | 制造商:Advanced Micro Devices 功能描述: |
| AM79C978AKC\W | 制造商:Advanced Micro Devices 功能描述: |
| AM79C978AKCW | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Single-Chip 1/10 Mbps PCI Home Networking Controller |
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