UPD9611 Datasheet, PDF (13/28 Pages) NEC – FOUR-CHANNEL PCM CODEC

µPD9611
Gain setting control is set by inputting 8-bit data fo the 1st word first and inputting 8-bit data of the 2nd
word in synchronization with the next rising edge of SPSYNC. However, if data other than the identification
code of the 2nd word is input after the input of the 1st word, the contents of the 1st word are ignored.
(i) When gain setting control is valid
SPCLK
SPSYNC
SPDATA 1 0 0 0 1 1 1 1
01001111
11011111
A/µ-law, power down control
(valid)
Gain setting control (1st word) Gain setting control (2nd word)
(valid)
(valid)
(ii) When gain setting control is invalid –1
SPCLK
SPSYNC
SPDATA 0 1 0 0 1 1 1 1
10001111
11011111
Gain setting control (1st word) A/µ-law, power down control
(invalid)
(valid)
Gain setting control (2nd word)
(invalid)
Remark Because A/µ-law, power down control is input after input of gain setting control (1st word),
gain setting control (1st word) becomes invalid and gain setting control (2nd word) also
becomes invalid.
(iii) When gain setting control is invalid –2
SPCLK
SPSYNC
SPDATA 1 1 0 1 1 1 1 1
01001111
10001111
Gain setting control (2nd word) Gain setting control (1st word) A/µ-law, power down control
(invalid)
(invalid)
(valid)
Remark Because gain setting control (2nd word) is input before gain setting control (1st word), gain
setting control (1st word) becomes invalid. Then, because A/µ-law, power down control
is input even if gain setting control (1st word) is input, gain setting control (1st word)
becomes invalid.
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