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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)： | 96/144頁 |
| 文件大?。?/td> | 1229K |
| 代理商： | CDK8920A |
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It may become necessary for the host to change
the Destination Address (DA) filter criteria with-
out resetting the CS8920A. This can be done as
follows:
1. Clear SerRxON (Register 13, LineCTL, Bit 6)
to prevent any additional receive frames while
the filter is being changed.
2. Modify the DA filter bits (B, A, 9, 7, and 6) in
the RxCTL register. Modify the Logical Ad-
dress Filter at PacketPage base + 0150h, if
necessary. Modify the Individual Address at
PacketPage base + 0158h, if necessary.
3. Set SerRxON to re-enable the receiver.
Because the receiver has been disabled, the
CS8920A will ignore frames while the host is
changing the DA filter.
Hash Filter
The hash filter is used to help determine which
Multicast frames and which Individual Address
frames should be accepted by the CS8920A.
Hash Filter Operation:
See Figure 5.5. The DA
of the incoming frame is passed through the
CRC logic, generating a 32-bit CRC value. The
six most-significant bits of the CRC are latched
into the 6-bit hash register (HR). The contents of
the HR are passed through a 6-to-64-bit decoder,
asserting one of the decoder’s outputs. The as-
serted output is compared with a corresponding
bit in the 64-bit Logical Address Filter, located at
PacketPage base + 0150h. If the decoder output
and the Logical Address Filter bit match, the
frame passes the hash filter and the Hashed bit
(Register 4, RxEvent, Bit 9) is set. If the two do
not match, the frame fails the filter and the
Hashed bit is clear.
Whenever the hash filter is passed by a "good"
frame, the RxOK bit (Register 4, RxEvent, Bit 8)
is set and the bits in the HR are mapped to the
Hash Table Index bits (Register 4, RxEvent, Bits
A through F).
Broadcast Frame Hashing Exception
Table 5.7 describes in detail the content of the
RxEvent register for each output of the hash and
address filters and describes an exception to nor-
mal processing. That exception can occur when
the hash-filter Broadcast address matches a bit in
the Logical Address Filter. To properly account
for this exception, the software driver should use
the following test to determine if the RxEvent
register contains a normal RxEvent (meaning bits
E-A are used for Extradata, Runt, CRC Error,
Broadcast and IndividualAdr) or a hash-table
RxEvent (meaning bits F-A contain the Hash Ta-
ble Index).
IAHashA
0
PromiscuousA
0
MulticastA
0
IndividualA
1
BroadcastA
0
Frames Accepted
Individual Address frames
with DA matching the IA at
PacketPage base + 0158h
Individual Address frames
with DA that pass the hash
filter (DA[0] must be 0)
Multicast frames with DA that
pass the hash filter (DA[0]
must be 1)
Broadcast frames
All frames
1
0
0
0
0
0
0
1
0
0
0
X
0
1
0
X
0
X
1
X
Table 5.6. Configuration Options for DA filtering
CS8920A
96
DS238PP2
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