參數(shù)資料
型號(hào)： AM79C972BVCW
廠(chǎng)商： ADVANCED MICRO DEVICES INC
元件分類(lèi)： 微控制器/微處理器
英文描述： PCnet⑩-FAST+ Enhanced 10/100 Mbps PCI Ethernet Controller with OnNow Support
中文描述： 5 CHANNEL(S), 100M bps, LOCAL AREA NETWORK CONTROLLER, PQFP176
封裝： TQFP-176
文件頁(yè)數(shù)： 85/130頁(yè)
文件大?。?/td> 1580K
代理商： AM79C972BVCW
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Am79C972
85
Figure 48.
OnNow Functional Diagram
When the software determines that the signal came
from the PCnet-
FAST
+ device, it writes to the device
’
s
PMCSR to put the device into power state D0. The soft-
ware then writes a 0 to the PME_STATUS bit to clear
the bit and turn off the PME signal, and it calls the de-
vice
’
s software driver to tell it that the device is now in
state D0. The system software can clear the
PME_STATUS bit either before, after, or at the same
time that it puts the device back into the D0 state.
Link Change Detect
Link change detect is one of Wake-up events defined
by the OnNow specification and is supported by the
RWU mode. Link Change Detect mode is set when the
LCMODE bit (CSR116, bit 8) is set either by software
or loaded through the EEPROM.
When this bit is set, any change in the Link status will
cause the LCDET bit (CSR116, bit 9) to be set. When
the LCDET bit is set, the RWU pin will be asserted and
the PME_STATUS bit (PMCSR register, bit 15) will be
set. If either the PME_EN bit (PMCSR, bit 8) or the
PME_EN_OVR bit (CSR116, bit 10) are set, then the
PME will also be asserted.
OnNow Pattern Match Mode
In the OnNow Pattern Match Mode, the PCnet-
FAST
+
compares the incoming packets with up to eight pat-
terns stored in the Pattern Match RAM (PMR). The
stored patterns can be compared with part or all of in-
coming packets, depending on the pattern length and
the way the PMR is programmed. When a pattern
match has been detected, then PMAT bit (CSR116, bit
7) is set. The setting of the PMAT bit causes the
MPDETECT
MPPEN
PG
MPMODE
MPEN
MPINT
LED
WUMI
Magic Packet
Link Change
LCMODE
Link Change
MPMAT
LCDET
S
R
Q
Q
DET
CLR
BCR47
BCR46
BCR45
S
R
Q
Q
SET
CLR
S
R
Q
Q
SET
CLR
S
R
Q
Q
SET
CLR
PMAT
Pattern Match
Input
Pattern
PME_STATUS
Pattern Match RAM (PMR)
PME Status
PME_EN
MPMAT
PME_EN_OVR
LCEVENT
PME
RWU
S
R
Q
Q
SET
CLR
POR
POR
H_RESET
POR
POR
21485C-51
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