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參數(shù)資料
型號(hào): W88227QD
廠商: WINBOND ELECTRONICS CORP
元件分類: 消費(fèi)家電
英文描述: ATAPI CD-ROM Decoder(支持ATAPI標(biāo)準(zhǔn)的CD-ROM解碼器)
中文描述: SPECIALTY CONSUMER CIRCUIT, PQFP128
封裝: LQFP-128
文件頁數(shù): 31/116頁
文件大小: 787K
代理商: W88227QD
Preliminary/Confidential
Subject to change without notice
W88227F/W88227QD
- 27 -
1999/10/1 Rev: 0.70
2.2.4.9 CD-DA data & Q-channel Extraction
There are no sync bytes in CD-DA format, so absolute MSF bytes of
Mode 1Data-Q
(ADR = 0001) should be
utilized as synchronization when reading CD-DA data. Q-channel extraction can be enabled by setting both
QEN (80h.w5)
and
SCEN (2Ch.w6)
high. Once decoder and Q-channel extraction are both enabled, the
extracted Q-channel bytes are written into the DRAM starting from offset 9E0h of each block regardless of
what mode of data is set.
The first byte of Q-channel (CONTROL and ADR) can be retrieved from offset 9E0h. When
QSIGEN (21h.4)
is set high, a signature 0xFFh will be placed in offset 9E0h if CRC checking of Q-code is erroneous.
The absolute MSF information can be retrieved from offset 9E7h, 9E8h and 9E9h of each block.
There is an alternative way to access MSF of Q-channel information. If control bit
QMSF (80h.w4)
is set high,
the corresponding MSF bytes in Q-channel information would be automatically loaded into
HEAD0-2 (04h-
06h,r)
when each byte is ready from DSP. The register
HEAD3 (07h,r)
hold first byte of
DATA-Q,
(CONTROL
and ADR) or 0xFFh if CRC checking of Q-channel is erroneous.
If Q-channel extraction is enabled, device firmware can check flag
QCRCOK (22h.r4)
to see if there is a CRC
error in the latest Q-channel information.
<example> SMD1 format setting:
BIAH/L (09h/08h) = 000Ch
CTRLW (10h.w) = 30h
SICTL0 (21h) = 30h
SICTL1 (2Ch,w) = 55h (SMD1 mode)
QEN (80h.w5) = 1 and QMSF (80h.w4) = 1
SDBS (88h.w4) = 1 and SBCK (88h.w3) = 1
CTRL1 (0Bh.w) = 80h
CTRL0 (0Ah.w) = 84h
SCIb (01h.r0)
SUBSTA (22h.r)
Following the above setting, there is no need to set
SICTL (21h.w), SCBH/L (27h/26h,w)
and
SCTC
(5Ah,w).
In order to transfer the whole sector to host, 2352 bytes, the value in
TWCH/L (03h/02h)
should be 0497h and the value in
TACH/L (05h/04h)
should be 0000h.
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