5
TM
ERROR CORRECTION STATISTICS
TCMERR
Output
16
Reports the number of estimated errors in the decoded IQ datastream
RSERR_U
Output
16
Reports the number of errors corrected by the Reed Solomon Decoder
(upper 16 bits)
RSERR_L
Output
16
Reports the number of errors corrected by the Reed Solomon Decoder
(lower 16 bits)
AGC CONTROL
AGCP
Output
1
AGC width-modulated pulse with period of 256 symbols. The pulse width
is proportional to the input signal level.
VCO CONTROL
VCOV
Output
12
VCO control voltage, 12-bit offset-binary format, normalized according to
the VCO frequency range such that the maximal value corresponds to
the lowest frequency and zero corresponds to the highest frequency,
updated every four symbols (9.25 MHz, 8 clock cycles)
VCSTRB
Output
1
VCO control voltage strobe, asserted for 4 cycles in every 8 clock cycles
to indicate the update of VCOV
ERROR CORRECTION CONTROL
RSERRPRD
Input
2
Static signal-sets the duration over which RS statistics are gathered
UPTCM
Input
8
Static signal used to control operation of TCM decoder
BYPASS
Input
1
Static signal, when asserted the TCM decoder is bypassed
LOCK STATUS
AGCOK
Output
1
AGC OK indicator, asserted when the average peak sample level is
within +/-15% of the ideal level
LCKBLL
Output
1
BLL lock flag, asserted when lock is declared or retained, updated once
every BLL lock detection window
LCKCLL
Output
1
CLL lock flag, asserted when lock is declared or retained, updated for
every output symbol (two clock cycles)
STATCLL
Output
3
CLL status, updated for every output symbol (two clock cycles)
000: idle (equalizer in initial mode, phase error set to 0)
001: initial (equalizer in CMA, phase error set to 0)
010: AFC (equalizer in CMA, estimate frequency offset)
011: DFS (equalizer in CMA, scan counter increases)
100: 4GC pull-in (equalizer in CMA, CLL 4GC pull-in)
110: DD pull-in (equalizer in CMA, CLL DD pull-in)
111: Lock (equalizer in DD, CLL DD tracking)
FIFOERROR
Output
1
When Asserted signifies the output fifo has overflowed and data has
been dropped
LCKTCM
Output
1
When asserted signifies the TCM decoder has achieved lock
LCKUW
Output
1
When asserted signifies that block synchronization has been achieved
Table 1: CS3810 32 QAM Demodulator Interface Signal Descriptions
Name
I/O
Width
Description
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