參數(shù)資料
型號(hào)： AM79C975VCW
廠商： ADVANCED MICRO DEVICES INC
元件分類： 微控制器/微處理器
英文描述： PCnet⑩-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY
中文描述： 5 CHANNEL(S), 100M bps, LOCAL AREA NETWORK CONTROLLER, PQFP176
封裝： TQFP-176
文件頁(yè)數(shù)： 102/304頁(yè)
文件大?。?/td> 2092K
代理商： AM79C975VCW
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102
Am79C973/Am79C975
P R E L I M I N A R Y
The LED pins can be configured to operate in either
open-drain mode (active low) or in totem-pole mode
(active high). The output can be stretched to allow the
human eye to recognize even short events that last only
several microseconds. After H_RESET, the four LED
outputs are configured as shown in Table 15.
Table 15. LED Default Configuration
For each LED register, each of the status signals is
AND
’
d with its enable signal, and these signals are all
OR
’
d together to form a combined status signal. Each
LED pin combined status signal can be programmed to
run to a pulse stretcher, which consists of a 3-bit shift
register clocked at 38 Hz (26 ms). The data input of
each shift register is normally at logic 0. The OR gate
output for each LED register asynchronously sets all
three bits of its shift register when the output becomes
asserted. The inverted output of each shift register is
used to control an LED pin. Thus, the pulse stretcher
provides 2 to 3 clocks of stretched LED output, or 52
ms to 78 ms. See Figure 48.
Power Savings Mode
Power Management Support
The Am79C973/Am79C975 controller supports power
management as defined in the PCI Bus Power Man-
agement Interface Specification V1.1 and Network De-
vice Class Power Management Reference
Specification V1.0.These specifications define the net-
work device power states, PCI power management in-
terface including the Capabilities Data Structure and
power management registers block definitions, power
management events, and OnNow network Wake-up
events. In addition, the Am79C973/Am79C975 control-
ler supports legacy power management schemes,
such as Remote Wake-Up (RWU) mode. When the
system is in RWU mode, PCI bus power is on, the PCI
clock may be slowed down or stopped, and the wake-
up output pin may drive the CPU's System Manage-
ment Interrupt (SMI) line.
Auxiliary Power
The Am79C973/Am79C975 uses the AUXDET pin to
detect whether it is powered by an auxiliary power sup-
ply that is always on or by the PCI power supply that
goes down during power saving modes.
If bit 15 of PMC is zero, indicating that PME assertion
in D3cold is not supported, the PME_Status and
PME_En bits of the PMCSR register will be reset by a
PCI bus reset (assertion of RST pin). This reset will ac-
tually occur after the EEPROM read following the reset
is complete to allow the controller to be configured.
To fully satisfy the requirements of the PCI power man-
agement specification in an adapter card configuration,
the AUXDET pin should be connected directly to the
auxiliary power supply and also to ground through a re-
sistor. This will sense the presence of the auxiliary
power and correctly report the capability of asserting
PME in D3cold.
For hardwired configurations where auxiliary power is
know to be always available or never available, the
AUXDET input may be disabled by connecting it di-
rectly or through a resistor to VDD. This will allow
BCR36 bit 15 to directly control PMC bit 15.
Figure 48. LED Control Logic
The general scheme for the Am79C973/Am79C975
power management is that when a PCI Wake-up event
is detected, a signal is generated to cause hardware
external to the Am79C973/Am79C975 device to put
the computer into the working (S0) mode.
The Am79C973/Am79C975 device supports three
types of wake-up events:
1. Magic Packet Detect
2. OnNow Pattern Match Detect
3. Link State Change
Figure 49 shows the relationship between these Wake-
up events and the various outputs used to signal to the
external hardware.
LED
Output
Indication
Driver Mode
Open Drain -
Active Low
Open Drain -
Active Low
Open Drain -
Active Low
Open Drain -
Active Low
Pulse Stretch
LED0
Link Status
Enabled
LED1
Receive
Status
Enabled
LED2
--
Enabled
LED3
Transmit
Status
Enabled
COL
COLE
FDLS
FDLSE
LNKS
LNKSE
RCV
RCVE
RCVM
RCVME
XMT
XMTE
To
Pulse
Stretcher
MR_SPEED_SEL
100E
MPS
MPSE
21510D-53
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM79C976 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet-PRO⑩ 10/100 Mbps PCI Ethernet Controller
AM79C976KC 制造商:Rochester Electronics LLC 功能描述:METRIC PLASTIC QUAD-RING - Bulk
AM79C976KCW 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:PCnet-PRO⑩ 10/100 Mbps PCI Ethernet Controller
AM79C976KD 制造商:Advanced Micro Devices 功能描述:ETHERNET:MEDIA ACCESS CONTROLLER (MAC)
AM79C976KF 制造商:Advanced Micro Devices 功能描述:Ethernet CTLR Single Chip 10Mbps/100Mbps 3.3V 208-Pin PQFP 制造商:AMD (Advanced Micro Devices) 功能描述:Ethernet CTLR Single Chip 10Mbps/100Mbps 3.3V 208-Pin PQFP
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