BT8110 데이터 시트보기 (PDF) - Conexant Systems

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BT8110

High-Capacity ADPCM Processor

Conexant Systems 

Bt8110/8110B

High-Capacity ADPCM Processor

2.0 Functional Description

2.2 Modes of Operation

Figure 2-4. Input and Output Timing for 48- or 64-Channel Half-Duplex Encoder-Only Operation (Microprocessor Control)

Ref. Cycle

8.192

(6.144) MHz

Clock

SYNC

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

ADPCM_STB

PCM_STB

4.096

(3.072) Mbit/s

SERIAL_IN

PSIG[7:0]

RESET

SERIAL_OUT

D[7:0]

D[7:0] Int (1)

S2345678 S2345678S23456

PCM-63 (47)

PCM-0

PCM-1

PCM-63 (47)

PCM-0

PCM-1

PCM-0

PCM-1

I5

I1 I2 I3 I4 I5

I1 I2 I3 I4 I5

I1 I2

ADPCM-60 (44)

ADPCM-61 (45)

ADPCM-60 (44)

ADPCM-61 (45)

ADPCM-62 (46)

ADPCM-60 (44)

ADPCM-61 (45)

ADPCM-62 (46)

NOTE(S):

(1) Bt8110B only.

100060_009

2.2.3 48- or 64-Channel Decoder-Only Operation

Figure 2-5 shows the functional timing for 48- or 64-channel decoder-only

operation. The channel numbers in parentheses are for the 48-channel mode.

Again, the timing is generally the same as for interleaved timing, but the inputs

are all ADPCM and the outputs are all PCM. Here, PCM_STB is active every 16

clock cycles, and ADPCM_STB is not active.

To operate the Bt8110/8110B in the 48- or 64-channel decoder-only, the Mode

Control Register should be set to a value of 0x0E for 64 channels or 0x06 for 48

channels.

The address table for the microprocessor per-channel controls

(encoder/decoder-only operation) is the same as for encoder-only operation and is

given in the Register Summary, Table 3-4.

100060C

Conexant

2-9

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