3.0 Registers
Bt8370/8375/8376
3.4 Interrupt Status Registers
Fully Integrated T1/E1 Framer and Line Interface
006—Error Interrupt Status (ISR5)
All events in ISR5 are from rising edge sources. Each event is latched active-high and held according to the
LATCH_ERR bit [addr 046] and triggers an interrupt if the corresponding IER5 bit is enabled [addr 00E].
7
6
5
4
3
2
1
0
TSLIP
RSLIP
CKERR
JERR
CERR
SERR
MERR
FERR
TSLIP
Transmit Slip Error—Two types of TSLIP buffer errors are reported, TFSLIP or TUSLIP. The
error type is reported separately in slip status [SSTAT; 0D9].
0 = no error
1 = TSLIP error
RSLIP
Receive Slip Error—Two types of RSLIP buffer errors are reported, RFSLIP or RUSLIP. The
error type is reported separately in slip status [SSTAT; 0D9].
0 = no error
1 = RSLIP error
CKERR
CLAD Phase Detector or JCLK Acceleration Error—Reports JCLK acceleration/deceleration
(enabled by JAUTO bit; addr 002).
CKERR
JAUTO
JCLK Acceleration
CKERR disabled
No error
X
0
0
1
1
1
JCLK acceleration active
JERR
Jitter Attenuator Elastic Store Limit Error—Indicates the transmit (TJAT) or receive (RJAT)
jitter attenuator elastic store has under-run or overflowed its programmed depth [JSIZE;
addr 002]. Error type is reported separately in JMPTY [addr 021]. JAT elastic store is
automatically re-centered each time JERR occurs, causing an uncontrolled data slip on the
elastic store output.
0 = no error
1 = uncontrolled JAT data slip
CERR
CRC6/CRC4 Block Error—Applicable to ESF and MFAS modes only; read 0 in other modes.
CERR indicates 1 or more bit errors found in the received CRC-6 or CRC-4 checksum block
pattern.
0 = no error
1 = CRC error
SERR
MERR
FERR
CAS Pattern Error—Applicable only in E1 mode; read 0 in T1 mode. SERR indicates 1 or
more bit errors found in received TS16 Multiframe Alignment Signal (MAS).
0 = no error
1 = CAS error
MFAS Pattern Error—Applicable only in E1 mode; read 0 in T1 mode. Indicates 1 or more bit
errors found in received MFAS alignment pattern.
0 = no error
1 = MFAS error
Frame Error—Ft/Fs/T1DM/FPS/FAS Pattern Error. Indicates 1 or more Ft/Fs/FPS frame bit
errors or FAS pattern errors found. Refer to Table A-1 through A-7 for a description of which
frame bits are monitored according to the selected receive framer mode.
0 = no error
1 = frame error
3-18
Conexant
N8370DSE
CONEXANT [ CONEXANT SYSTEMS, INC ]
