GC5318 Datasheet, PDF (16/45 Pages) Texas Instruments – HIGH-DENSITY DIGITAL UPCONVERTER

GC5318
HIGH-DENSITY DIGITAL UPCONVERTER
SLWS187 – JULY 2006
Table 2-10. Programming
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VARIABLE
tadj_offset_coarse_a(5:0)
tadj_offset_coarse_b(5:0)
tadj_offset_fine_a(2:0)
tadj_offset_fine_b(2:0)
tadj_interp_decim(2:0)
ssel_tadj_fine(2:0)
ssel_tadj_coarse(2:0)
DESCRIPTION
Read offset into the 64-element memory for the A channel DUC. When tadj_offset_coarse_a = 62, then the
delay is –2. When tadj_offset_coarse_a = 63, then the delay is –1. For all other values, the resulting delay is
equal to the value.
Read offset into the 64-element memory for the B channel DUC when in CDMA mode. Note: When
tadj_offset_coarse_b = 62, then the delay is –2. When tadj_offset_coarse_b = 63, then the delay is –1. For all
other values, the resulting delay is equal to the value.
Controls the zero offset (fine adjust) for the A side of the DUC. The fine adjust is mapped differently.
Controls the zero offset (fine adjust) for the B side of the DUC when in CDMA mode. The fine adjust is
mapped differently.
The decimation value (1, 2, 4, or 8) for the DUC. Same for A and B channels when in CDMA mode.
Selects the sync source for the fine time adjust.
Selects the sync source for the coarse time delay adjust.
For a decimation value of 1, the only legal setting is 0; there is no fine adjustment since there is no
decimation moment.
tadj_offset_fine = 0 → fine delay by 0
For a decimation value of 2:
tadj_offset_fine = 0 → fine delay by 0
tadj_offset_fine = 1 → fine delay by 1
For a decimation value of 4:
tadj_offset_fine = 0 → fine delay by 0
tadj_offset_fine = 1 → fine delay by –1
tadj_offset_fine = 2 → fine delay by –2
tadj_offset_fine = 3 → fine delay by 1
For a decimation value of 8:
tadj_offset_fine = 0 → fine delay by 0
tadj_offset_fine = 1 → fine delay by –1
tadj_offset_fine = 2 → fine delay by –2
tadj_offset_fine = 3 → fine delay by –3
tadj_offset_fine = 4 → fine delay by –4
tadj_offset_fine = 5 → fine delay by –5
tadj_offset_fine = 6 → fine delay by –6
tadj_offset_fine = 7 → fine delay by 1
16
GC5318 Operation