CS8900A
Crystal LAN™ ISA Ethernet Controller
Receive Frame
Yes
No
DA Filter
Passed?
Discard Frame
RxDest set.
Host may read the DA
(first 6 received bytes).
Yes
64 bytes
Received?
No
EOF
Received?
No
RxDest cleared
and Runt set.
Yes
If RuntA is set,
frame accepted and
Host may read frame.
Yes
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, frame accepted and
Host may read frame.
EOF
No
Received?
Rx128 cleared and
RxOK, CRCerror or
Yes
Extradata set, as
appropriate. If ExtradataA,
RxOKA or CRCerrorA is
set, frame is accepted and
Host may read frame.
Figure 22. Early Interrupt Generation
CIRRUS LOGIC PRODUCT DATA SHEET
DS271PP3
85
CIRRUS [ CIRRUS LOGIC ]
