OKI Semiconductor
FEDL7055-02
ML7055
PCM-CVSD Transcoder Block
• Application side I/O:
- PCM Codec
• Application-side format:
- PCM linear (8, 14, 16 bits/sample, 8 kHz sampling frequency)/A-law/µ-law
• Bluetooth-side format:
- CVSD/A-law/µ-law
• All combinations of the above conversions are supported
• PCMSYNC/PCMCLK I/O can be switched (initial setting: input)
• Timing in Short Mode and in PCMCLK and PCMSYNC Output Mode
(For PCM data of 14 bits/sample, lower 2 bits of 16 bits are invalid.)
8 bits or 16 bits
PCMCLK(O)
64k/128kHz
PCMOUT
LSB
MSB
DATA
DATA
Data is output on the rising edge of CLK.
DATA
LSB
PCMIN
LSB
MSB
DATA
DATA
DATA
LSB
PCMSYNC(O)
Data is shifted in on the falling edge of CLK
125µs (8kHz)
MSB
DATA
MSB
DATA
• Timing in Short Mode and in PCMCLK and PCMSYNC Input Mode.
(For PCM data of 14 bits/sample, lower 2 bits of 16 bits are invalid.)
PCMCLK(I)
64k/128kHz
PCMOUT
PCMIN
PCMSYNC(I)
8 bits or 16 bits
LSB
MSB
DATA
DATA
Data is output on the rising edge of CLK.
DATA
LSB
LSB
MSB
DATA
DATA
DATA
LSB
Data is shifted in on the falling edge of CLK
125µs (8kHz)
MSB
DATA
MSB
DATA
14/30