
CYP15G0101DXA
PRELIMINARY
Document #: 38-02061 Rev. **
Page 21 of 40
Table 17. Receive Character Status Bits
RXST[2:0] Priority
000
Description
Type-A Status
Normal Character Received.
The valid Data character on the output
bus meets all the formatting requirements of Data characters listed in
Table 21
.
Special Code Detected.
The valid special character on the output bus
meets all the formatting requirements of the Special Code characters
listed in
Table 22
, but is not the presently selected framing character or
a Decoder violation indication.
Receive Elasticity Buffer Under-
run/Overrun Error.
The receive
buffer was not able to add/drop a
K28.5 or framing character.
Framing Character detected.
This indicates that a character matching
the patterns identified as a framing character (as selected by FRAM-
CHAR) was detected. The decoded value of this character is present in
the output bus.
Codeword Violation.
The character on the output bus is a C0.7. This
indicates that the received character cannot be decoded into any valid
character.
Loss of Sync.
The character on
the bus is invalid, due to an event
that has caused the receive chan-
nels to lose synchronization. This
indicates a PLL Out of Lock condi-
tion.
Type-B Status
Receive BIST Status
(Receive BIST = Enabled)
BIST Data Compare.
Charac-
ter compared correctly
7
001
7
BIST Command Compare.
Character compared correctly
010
2
RESERVED
BIST Last Good.
Last Charac-
ter of BIST sequence detected
and valid.
011
5
100
4
BIST Last Bad.
Last Character
of BIST sequence detected in-
valid.
BIST Start.
Receive BIST is en-
abled on this channel, but char-
acter compares have not yet
commenced. This also indi-
cates a PLL Out of Lock condi-
tion, and Elasticity Buffer over-
flow/underflow conditions.
101
1
Loss of Sync.
The character on
the bus is invalid, due to an event
that has caused the receive chan-
nels to lose synchronization. This
indicates a loss of character fram-
ing. Also used to indicate receive
Elasticity Buffer underflow/overflow
errors.
110
6
Running Disparity Error.
The character on the output bus is a C4.7,
C1.7, or C2.7.
BIST Error.
While comparing
characters, a mismatch was
found in one or more of the de-
coded character bits.
BIST Wait.
The receiver is com-
paring characters. but has not
yet found the start of BIST char-
acter to enable the LFSR.
111
3
RESERVED