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參數資料
型號: W88227F
廠商: WINBOND ELECTRONICS CORP
元件分類: 消費家電
英文描述: ATAPI CD-ROM Decoder(支持ATAPI標準的CD-ROM解碼器)
中文描述: SPECIALTY CONSUMER CIRCUIT, PQFP128
封裝: PLASTIC, QFP-128
文件頁數: 35/116頁
文件大小: 787K
代理商: W88227F
Preliminary/Confidential
Subject to change without notice
W88227F/W88227QD
- 31 -
1999/10/1 Rev: 0.70
2.2.5 Audio-playback
2.2.5.1 Configuration Phase
1. Configure input/output pin for Audio-playback through
APCNF (90h).
- Bit 6: Audio Playback Interrupt Enable
- Bit 4: Audio Reference Clock Select
- Bit 3,2: Audio Input Reference Clock Setting
- Bit 1:0: Audio Data Output Setting
2. Select Audio-playback output format through
APFMT (91h).
After configuration,
pin ABCK
becomes active but data pin keep "mute."
2.2.5.2 Playback Phase
If the desired data sectors are buffered in DRAM, the following steps can trigger audio playback:
1. Set Audio-playback start block through
APBKH/L (93h/92h).
2. Enable Audio-playback by setting
APEN (90h.7)
high.
3. Wait for interrupt or polling flag
APIb (01h.r2).
4. If
APIEN (90h.6)
is enabled, write
APACK (97h,w)
to deactivate audio-playback-interrupt.
5. If buffer is not empty or end of command, go to step 3.
6. Disable Audio-playback by setting
APEN (90h.7)
low.
The status of playback is directly controlled by the setting of
APEN (90h.7).
So the buffer should be carefully
managed to prevent noise or broken song.
2.2.5.3 IEC-958 Digital Audio Output
The digital output function complies with the IEC-958 standard. This internal function is automatically
enabled after configuration of audio playback function. The digital audio signal is output to
pin
GPIO2/DAOOUT/nFCE
when
DAOEN (87h.7)
is set high after master reset.
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