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參數資料
| 型號： | W9321 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 編解碼器 |
| 英文描述： | ADPCM Codec(ADPCM編解碼器) |
| 中文描述： | MU-LAW, ADPCM CODEC, PDIP28 |
| 封裝： | PLASTIC, DIP-28 |
| 文件頁數： | 11/35頁 |
| 文件大小： | 457K |
| 代理商： | W9321 |
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Preliminary W9321
Publication Release Date: May 1999
- 11 -
Revision A1
7.3.3. Frame Sync. Types
The frame sync operation uses two industrial control types for the transfer of the ADPCM or PCM
data words. These two types are the long frame sync and short frame sync.
7.3.3.1. Long Frame Sync
The long frame sync types for various data rates are shown in Figure 7-1 to 7-4. The bit rate for the
ADPCM or PCM encoder and decoder is determined by the length of the frame sync pin (FST or
FSR). The length of the frame sync is calculated by the number of falling edges at the BCLKT or
BCLKR pin when the frame sync FST or FSR pin is high. For example, if the number of the falling
edges on the BCLKT or BCLKR pin is equal to 2 when the frame sync is high, this corresponds to the
16 Kbps bit rate for the encoder and decoder of the ADPCM operation. If the number is 8, the device
becomes 64 Kbps PCM operation. The device shifts out the data on the DT pin at the BCLKT rising
edge and shifts in the data on the DR pin at the BCLKR falling edge. The length of the frame sync
may be changed on a frame by frame basis.
7.3.3.2. Short Frame Sync
The short frame sync types for 32 Kbps ADPCM timing is shown in Figure 7-5. The bit rate for this
type of frame performs only 32 Kbps ADPCM encoding and decoding. The length of the frame sync is
equal to 1. The device shifts out data on the DT pin at the BCLKT rising edge and shifts in data on the
DR pin at the BCLKR falling edge. Switching between long frame sync and short frame sync without
going through a power down operation is not recommended.
D0
D1
D0
BCLKT
(BCLKR)
FST
(FSR)
1
2
3
4
5
6
7
8
DT
DR
Don't Care
Don't Care
LSB
MSB
LSB
D1
MSB
Figure 7-1 Long Frame Sync for 16 Kbps ADPCM Timing
D1
D1
BCLKT
(BCLKR)
FST
(FSR)
1
2
3
4
5
6
7
8
DT
DR
D2
Don't Care
D0
D2
MSB
LSB
MSB
LSB
Don't Care
D0
Figure 7-2 Long Frame Sync for 24 Kbps ADPCM Timing
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