GC5316_14 Datasheet, PDF (36/76 Pages) Texas Instruments – HIGH-DENSITY DIGITAL DOWNCONVERTER AND UPCONVERTER

GC5316
SLWS154A − JANUARY 2004 − REVISED MARCH 2004
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Table 10. Programming
VARIABLE
DESCRIPTION
tadj_offset_coarse_a(5:0) 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.
tadj_offset_coarse_b(5:0) 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.
tadj_offset_fine_a(2:0) Controls the zero offset (fine adjust) for the A side of the DUC.
See note below for mapping.
tadj_offset_fine_b(2:0) Controls the zero offset (fine adjust) for the B side of the DUC when in CDMA mode.
See the note below for mapping.
tadj_interp_decim(2:0) The decimation value (1, 2, 4, or 8) for the DUC. Same for A and B channels when in CDMA mode.
ssel_tadj_fine(2:0)
Selects the sync source for the fine time adjust
ssel_tadj_coarse(2:0) Selects the sync source for the coarse time delay adjust
NOTE: _{The fine adjust is mapped differently.}
For a decimation value of 1 the only legal setting is 0 and 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
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