CS8900A
Crystal LAN™ Ethernet Controller
Receive Fram e
Yes
No
DA Filter
Passed?
Discard Frame
RxD est set.
Host m ay read the D A
(first 6 received bytes).
Ye s
64 bytes
R eceived?
No
EOF
Received?
No
RxDest cleared
and Runt set.
Yes
If RuntA is set,
fram e accepted and
Host may read frame.
Ye s
128 bytes
Received?
No
Rx128 set and
RxDest cleared.
Host may read first
128 received bytes.
EOF
Received?
No
RxDest cleared and
RxOK or CRCerror
set, as appropriate.
Yes
If RxOKA or CRCerrorA
is set, fram e accepted and
Host may read frame.
EOF
No
Received?
Rx128 cleared and
RxO K, CRCerror or
Extradata set, as
Yes
appropriate. If ExtradataA,
RxOKA or CRCerrorA is
set, fram e is accepted and
Host m ay read fram e.
Figure 22. Early Interrupt Generation
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DS271F4
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