DS21354/DS21554 3.3V/5V E1 Single-Chip Transceivers
RIR: RECEIVE INFORMATION REGISTER (Address = 08 Hex)
(MSB)
(LSB)
TESF
TESE
JALT
RESF
RESE
CRCRC
FASRC
CASRC
SYMBOL POSITION
NAME AND DESCRIPTION
Transmit-Side Elastic Store Full. Set when the transmit-side elastic
store buffer fills and a frame is deleted.
TESF
RIR.7
Transmit-Side Elastic Store Empty. Set when the transmit-side elastic
store buffer empties and a frame is repeated.
TESE
RIR.6
Jitter Attenuator Limit Trip. Set when the jitter attenuator FIFO reaches
to within 4–bits of its limit; useful for debugging jitter attenuation
operation.
JALT
RIR.5
Receive-Side Elastic Store Full. Set when the receive side elastic store
buffer fills and a frame is deleted.
RESF
RESE
RIR.4
RIR.3
RIR.2
Receive-Side Elastic Store Empty. Set when the receive side elastic store
buffer empties and a frame is repeated.
CRC Resync Criteria Met. Set when 915/1000 codewords are received
in error.
CRCRC
FAS Resync Criteria Met Event (FASRC). Set when three consecutive
FAS words are received in error. Note: During a CRC resync the FAS
synchronizer is brought online to verify the FAS alignment. If during this
process a FAS emulator exists, the FAS synchronizer may temporarily
align to the emulator. The FASRC will go active indicating a search for a
valid FAS has been activated.
FASRC
CASRC
RIR.1
RIR.0
CAS Resync Criteria Met. Set when two consecutive CAS MF
alignment words are received in error.
SSR: SYNCHRONIZER STATUS REGISTER (Address = 1E Hex)
(MSB)
(LSB)
CSC5
CSC4
CSC3
CSC2
CSC0
FASSA
CASSA
CRC4SA
SYMBOL POSITION
NAME AND DESCRIPTION
CSC5
CSC4
CSC3
CSC2
SSR.7
SSR.6
SSR.5
SSR.4
CRC4 Sync Counter Bit 5. MSB of the 6-bit counter.
CRC4 Sync Counter Bit 4.
CRC4 Sync Counter Bit 3.
CRC4 Sync Counter Bit 2.
CRC4 Sync Counter Bit 0. LSB of the 6-bit counter. The next to LSB is
not accessible.
CSC0
FASSA
CASSA
CRC4SA
SSR.3
SSR.2
SSR.1
SSR.0
FAS Sync Active. Set while the synchronizer is searching for alignment
at the FAS level.
CAS MF Sync Active. Set while the synchronizer is searching for the
CAS MF alignment word.
CRC4 MF Sync Active. Set while the synchronizer is searching for the
CRC4 MF alignment word.
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