BT8954 CONEXANT [Conexant Systems, Inc], BT8954 Datasheet - Page 37

• Manufacturer Part Number: BT8954
• Description: VOICE PAIR GAIN FRAMER
• Manufacturer: CONEXANT [Conexant Systems, Inc]

Bt8954
Voice Pair Gain Framer
Figure 3-13. PCMF [18:1] Waveforms for Encoded and Decoded Frame SYNC Modes
N8954DSC
(2.048 MHz)
(2.048 MHz)
(2.048 MHz)
PCMF[18:3]
EPCMF[6:1]
PCMF[18:7]
NOTE(S):
PCMF18
PCMCKI
PCMCKI
PCMCKI
PCMF1
PCMF2
PCMF1
3) ADPCM36: 18 Compressed Channels
PCMT/
PCMT/
PCMR
PCMR
PCMT/
PCMR
1) PCM2: 2 Clear Channels
2) PCM18: 18 Clear Channels
SYNC_WIDTH (PCM_FORMAT_4) = 0001; FSYNC2BYTE (PCM_FORMAT_4) = 0001.
BYTE1[7:4]
[00 0001]
Time Slot 1
BYTE1
3.9056µs
BYTE1
illustrated in
BYTE1[3:0]
[00 0010]
The PCMF[18:1] (EPCMF[6:1]) waveforms for various scenarios are
BYTE2
BYTE2[7:4]
[00 0011]
Figure
Time Slot 2
BYTE2
Conexant
3-13.
BYTE17[3:0]
125µs
BYTE17
[10 0010]
[0000 0000 0000]
BYTE18[7:4]
[10 0011]
BYTE18
30 Unused Timeslots
BYTE18[3:0]
[10 0100]
3.0 Circuit Descriptions
14 Unused
Time Slots
[00 0000]
3.5 PCM Formatter
BYTE1[7:4]
BYTE1
BYTE1
[00 0001]
3-15