GC4116 datasheet(45/57 Pages) ETC

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GC4116 MULTI-STANDARD QUAD DUC CHIP

DATA SHEET REV 1.0

- 40 -

APRIL 27, 2001

This document contains preliminary information which may be changed at any time without notice

RESAMPLER CONTROL PAGE 8 (continue)

ADDRESS 23:

Ratio Map Register

Suggested default = 0x00

The default ratio maps select ratio 0 for all four channels. The resampler in the GC4116 must use the same ratio for all

resampler channels, which means that the valid values for the ratio map are 0x00, 0x55, 0xAA and 0xFF to select ratio 0, 1, 2 or 3.

The ratio maps can also be used to synchronously switch between resampling ratios. This allows the chip’s resampler to be

used in timing loops where the ratio must toggle between several values which have been programmed into the chip.

5.9

RESAMPLER RATIO PAGE (PAGE 9)

This page stores four resampler ratios to be used by the resampler channels. Each ratio is the 32 bit ratio of the input sample

rate to the output sample rate with an implicit decimal point six bits down from the top. The total range for the ratio is then 0 to

63. The hardware limits the decimation to be less than 32 (hence the MSB of the 32 bit word should always be zero).

RATIO = 226(Input Sample Rate)/(Output Sample Rate)

The ratio map register selects which ratio is used by the resampler.

BIT

TYPE

NAME

DESCRIPTION

0-1 LSB

R/W

RATIO_MAP_0

The ratio map for resampler channel 0. This tells the hardware which resampler

ratio should be use for resampler channel 0.

2-3

R/W

RATIO_MAP_1

The ratio map for resampler channel 1.

4-5

R/W

RATIO_MAP_2

The ratio map for resampler channel 2.

6-7 MSB

R/W

RATIO_MAP_3

The ratio map for resampler channel 3.

Table 9: Resampler Ratio Page

ADDRESS

NAME

ADDRESS

NAME

RATIO_0 (LSBs)

RATIO_2 (LSBs)

RATIO_0

RATIO_2

RATIO_0

RATIO_2

RATIO_0 (MSBs)

RATIO_2 (MSBs)

RATIO_1 (LSBs)

RATIO_3 (LSBs)

RATIO_1

RATIO_3

RATIO_1

RATIO_3

RATIO_1 (MSBs)

RATIO_3 (MSBs)

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