參數(shù)資料
型號: CDK8920A
廠商: Cirrus Logic, Inc.
英文描述: CRYSTAL LAN ISA PLUG-AND-PLAY ETHERNET CONTROLLER
中文描述: 水晶藍的ISA即插即用,即插即用以太網(wǎng)控制器
文件頁數(shù): 97/144頁
文件大?。?/td> 1229K
代理商: CDK8920A
64-bit Logical Address Filter (LAF)
Written into PacketPage base + 150h
Figure 5.5. Hash Filter Operation
6-to-64 decoder
1
64
CS8920A
CRC
Logic
Destination Address (DA)
from incoming frame
32-bit CRC value
(MSB)
(LSB)
6-bit Hash Register (HR)
[Hash Table Index]
64-input
OR gate
to
Hashed
bit
Address
Type of
Received
Frame
Individual
Address
Erred
Frame
Passes
Hash
Filter
Contents of RxEvent
Bits F-A
Bit 9
Hashed
Bit 8
RxOK
Bit 6
IAHash
no
no
yes
no
Hash Table Index
1
0
1
1
1
0
ExtraRuntCRCBroadcastIndividual
DataErrorAdr
don’t care
ExtraRuntCRCBroadcastIndividual
DataErrorAdr
yes
Hash table index
no
ExtraRuntCRCBroadcastIndividual
DataErrorAdr
don’t care
ExtraRuntCRCBroadcastIndividual
DataErrorAdr
yes (Note 1)
ExtraRuntCRCBroadcastIndividual
DataErrorAdr
(actual value X00010)
no
ExtraRuntCRCBroadcastIndividual
DataErrorAdr
don’t care
ExtraRuntCRCBroadcastIndividual
DataErrorAdr
yes
0
0
0
Multicast
Address
no
no
1
0
1
1
0
0
yes
0
0
0
Broadcast
Address
no
1
1
0
no
0
1
0
yes
0
0
0
NOTES:
1. Broadcast frames are accepted as Multicast frames if and only if all the following conditions are
met simultaneously:
a) the Logical Address Filter is programmed as: (MSB) 0000 8000 0000 0000h (LSB). Note that
this LAF value corresponds to a Multicast Addresses of both all 1s and 03-00-00-00-00-01.
b) The Rx Control Register (register 5) is programmed to accept IndividualA, MulticastA, RxOK-only,
and the following address filters were enabled: IAHashA and BroadcastA.
2. NOT (Note 1).
3. This frame is accepted if the promiscuous accept bit is set.
4. This frame is accepted if either promiscuous accept or broadcast accept bit are set.
Table 5.7. Contents of RxEvent Upon Various Conditions
CS8920A
DS238PP2
97
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