GC5316 datasheet(36/75 Pages) TI

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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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