Specifications

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SLWS142J − JANUARY 2003 − REVISED AUGUST 2007
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Table 47. FIR Accumulator Controls Page 0x14 Address 0x11
Rcv Tx FIELD BITS Dflt DESCRIPTION
E E acc_dly 3..0 FIR accumulator delay minus 1
E E acc_cnt 7..4 FIR number of partial products to accumulate
E E acc_dly0 8 FIR no accumulator delay (1) or not (0)
E E acc_bypass 9 FIR accumulator bypass (1) or normal (0). Must also set acc_cnt to zero for bypass.
E E acc_enram 10 FIR enable accumulate ram (1) normal. Set to 0 when acc_dly0 is 1.
Table 48. FIR Output Page 0x14 Address 0x12
Rcv Tx FIELD BITS Dflt DESCRIPTION
C C fir_shift 2..0 FIR shift up. Increase filter gain
C C fir_xenq 3 FIR transmit enable q. Set for transmit and complex filtering.
C C fir_xeni 4 FIR transmit enable i. Set for transmit, clear in receive.
C C fir_half 5 FIR half scale. Set to 0.
C C fir_rnd20 6 FIR round For receive, set to 1 for 20 bits to gain. In transmit, set to 0 for 18 bits to CIC.
C C fir_cmplx 7 FIR outputs complex data. Normally set, clear for splitiq or some bypass modes.
Table 49. FIR Sync Count Page 0x14 Address 0x13
Rcv Tx FIELD BITS Dflt DESCRIPTION
E E fir_sync_cnt 15..0 FIR internal sync count to periodically resync various FIR counters
Table 50. FIR Clock Page 0x14 Address 0x14
Rcv Tx FIELD Bits Dflt Description
E E fir_clk_cnt 7..0 Number of FIR clocks per CIC input (xmt) or output (rcv) minus 1
E E fir_clk_cnt_en 8 1 for normal operation; set to 0 and fir_clk_cnt+1 for FIR clock always on
E E fir_test 9 Set to 0 for normal operation
E E fir_en_sync_cnt 10 Enable fir sync counter (1)
D D cksum_sync_back 14..12 7 Receive checksum sync and transmit pattern generator sync
17.15 FIR, Gain, Power Meter, and Channel Clock Synchronization
The channel synchronization is programmed through the sync_mode command, or register value commands. It is
recommended that the cic_sync, fir_sync, and sck_sync are selected to the same synchronization source. In normal
use the gain_sync value is set to always. The pwr_mtr_sync, and coef_sync can be synchronized to the manual or
one shot sources.
Table 51. Channel Syncs Page 0x14 Address 0x15
Rcv Tx FIELD BITS Dflt DESCRIPTION
D D fir_sync 2..0 2 Sync source selection for FIR
D D coef_sync 5..3 6 Sync source selection for coefficient swapping. Used with multiple coefficient sets.
D D gain_sync 8..6 6 Sync source selection for gain updates
D D pwr_mtr_sync 11..9 7 Sync source selection for starting power meter
D D sck_sync 14..12 4 Sync source selection for slow clock divider