VSC6134
Datasheet
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TCM AIS
TCM LTC
A zero-to-one transition on OTUk_TCM_TTIINVD invalidates the entire TTI trace.
TCM Bit Interleaved Parity 8 (BIP-8)
Two internal counters accumulate the BIP-8 parity errors (24-bit counter) and BIP-8 block errors (20-bit
counter). If calculated BIP-8 is 01011010 and received BIP-8 is 00011101, for example, then the parity
error counter increments by 4 and the block error counter increments by 1.
Once every second, the TCM BIP-8 error counts transfer to a set of duplicate cache registers
OTUk_TCM_BIP8CNT[23:0] and OTUk_TCM_BIP8CNTBL[19:0] for microprocessor read access.
Depending on the microprocessor configuration bit SAT_ROLLOVERN, the accumulators either clear
(SAT_ROLLOVERN = 1) or retain their value (SAT_ROLLOVERN = 0) when the count transfers.
Any one of the following conditions pauses TCM BIP-8 monitoring:
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OOF when OTUk_OOFCNT_CTRL = 1
LOF
LOS
TCM IAE when OTUk_IAE_CTRL = 1
TCM AIS
TCM OCI
TCM LTC
TCM LCK
A BIP-8 parity error sets the status bit OTUk_TCM_BIP8ERRS. OTUk_TCM_BIP8ERRS and its
respective interrupt mask bit, OTUk_TCM_BIP8ERRM, create a maskable interrupt.
TCM Backward Defect Indication (BDI)
The TCM BDI monitor debounces TCM BDI by detecting identical TCM BDI bits over five
consecutive frames. The live bit OTUk_TCM_BDIL is the last valid value of the debounced BDI. A
status bit OTUk_TCM_BDIS is set on each OTUk_TCM_BDIL change of state. OTUk_TCM_BDIS
and its respective mask bit OTUk_TCM_BDIM create a maskable interrupt.
Any one of the following conditions resets the debouncing and pauses TCM BDI monitoring:
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OOF when OTUk_OOFDBC_CTRL = 1
LOF
LOS
TCM LCK
TCM OCI
TCM AIS
TCM LTC
TCM Backward Error Indication (BEI)
The TCM BEI monitor accumulates the BEI value in a 24-bit counter. Every second the BEI error count
transfers to a cache register OTUk_TCM_BEICNT[23:0] for microprocessor read access. Depending on
the microprocessor configuration bit SAT_ROLLOVERN, the accumulator either clears
(SAT_ROLLOVERN = 1) or retains its value (SAT_ROLLOVERN = 0) after the count transfers.
128 of 438
VMDS-10185 Revision 4.0
July 2006
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
