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參數(shù)資料
| 型號(hào)： | AM79C974KCW |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | PCnetTM-SCSI Combination Ethernet and SCSI Controller for PCI Systems |
| 中文描述： | 2 CHANNEL(S), 10M bps, LOCAL AREA NETWORK CONTROLLER, PQFP132 |
| 封裝： | PLASTIC, QFP-132 |
| 文件頁(yè)數(shù)： | 58/153頁(yè) |
| 文件大?。?/td> | 838K |
| 代理商： | AM79C974KCW |
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AMD
P R E L I M I N A R Y
58
Am79C974
Ethernet Power Savings Modes
The Am79C974’s Ethernet controller supports two hard-
ware power savings modes. Both are entered by driving
the
SLEEP
pin LOW.
The PCI interface section is not effected by
SLEEP
. In
particular, access to the PCI configuration space re-
mains possible. None of the configuration registers will
be reset by
SLEEP
. All I/O accesses to the Am79C974’s
Ethernet controller will result in a PCI target abort
response.
The first power saving mode is called coma mode. In
coma mode, the Am79C974 controller has no means to
use the network to automatically wake itself up. Coma
mode is enabled when the AWAKE bit in BCR2 is reset.
Coma mode is the default power down mode.
The second power saving mode is called snooze mode.
In snooze mode, enabled by setting the AWAKE bit in
BCR2 and driving the
SLEEP
pin LOW, the T-MAU re-
ceive circuitry will remain enabled even while the
SLEEP
pin is driven LOW. The
LNKST
output is the only
one of the LED pins that continues to function. The
LNKSTE bit must be set in BCR4 to enable indication of
a good 10BASE-T link if there are link beat pulses or
valid frames present. This
LNKST
pin can be used to
drive an LED and/or external hardware that directly con-
trols the
SLEEP
pin of the Am79C974 controller. This
configuration effectively wakes the system when there
is any activity on the 10BASE-T link. Snooze mode can
be used only if the T-MAU is the selected network port.
Link beat pulses are not transmitted during snooze
mode.
If the
REQ
output is active when the
SLEEP
pin is as-
serted, then the Am79C974 controller will wait until the
GNT
input is asserted. Next, the Am79C974 controller
will deassert the
REQ
pin and finally, it will internally en-
ter either the coma or snooze sleep mode.
Before the sleep mode is invoked, the Am79C974 con-
troller will perform an internal S_RESET. This
S_RESET operation will not affect the values of the BCR
registers or the PCI configuration space.
The
SLEEP
pin should not be asserted during power
supply ramp-up. If it is desired that
SLEEP
be asserted
at power up time, then the system must delay the asser-
tion of
SLEEP
until three CLK cycles after the comple-
tion of a valid pin
RST
operation.
Software Access
Ethernet PCI Configuration Registers
The Am79C974 controller supports the 64-byte header
portion of the configuration space as predefined by the
PCI specification revision 2.0. None of the device spe-
cific registers in locations 64 – 255 are used by the
Ethernet controller. The layout of the configuration reg-
isters in the header region is shown in the table below.
All registers required to identify the Am79C974 control-
ler and its function are implemented. Additional regis-
ters are used to setup the configuration of the
Am79C974 controller in a system.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AM79C975 | PCnet⑩-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY |
| AM79C973 | PCnet⑩-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY |
| AM79C973KCW | PCnet⑩-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY |
| AM79C975KCW | PCnet⑩-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY |
| AM79C973VCW | PCnet⑩-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AM79C975 | 制造商:AMD 制造商全稱(chēng):Advanced Micro Devices 功能描述:PCnet⑩-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY |
| AM79C975BKC\\W | 制造商:Advanced Micro Devices 功能描述: |
| AM79C975BKC\W | 制造商:Advanced Micro Devices 功能描述: |
| AM79C975BKD\\W | 制造商:Advanced Micro Devices 功能描述: |
| AM79C975BKD\W | 制造商:Advanced Micro Devices 功能描述:PCnet-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY 制造商:AMD (Advanced Micro Devices) 功能描述:PCnet-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY |
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