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GC5318

HIGH-DENSITY DIGITAL UPCONVERTER

SLWS187 – JULY 2006

Table 2-10. 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. The fine adjust is mapped differently.

tadj_offset_fine_b(2:0)

Controls the zero offset (fine adjust) for the B side of the DUC when in CDMA mode. The fine adjust is

mapped differently.

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.

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

GC5318 Operation

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