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參數(shù)資料
型號(hào): W88113C
廠商: WINBOND ELECTRONICS CORP
英文描述: ATAPI CD-ROM DECODER & CONTROLLER
中文描述: ATAPI的CD - ROM解碼器
文件頁數(shù): 93/102頁
文件大小: 573K
代理商: W88113C
W88113C
Publication Release Date: Mar. 1999
- 89 - Revision 0.61
disc format
SIEN
(0Bh.7)
SDEN
(0Bh.6)
DESCREN
(0Bh.5)
CWEN
(0Bh.4)
M2RQ
(0Bh.3)
F2RQ
(0Bh.2)
CD-DA
1
0
0
0
0
0
yellow book Mode 1
1
1
1
1
0
0
yellow book Mode 2
1
1
1
0
0
0
CD-ROM XA M2F1
1
1
1
1
1
0
CD-ROM XA M2F2
1
1
1
x
1
1
5.4.9 CD-DA data & Q-channel Extraction
There are no sync bytes in CD-DA format, so MSF bytes of Q-channel information can 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 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.
Notice
that the value in register
HEAD3
(07h,r)
and
SUBH0-3 (14h-17h,r)
are not available if
QMSF (80h.w4)
is set high.
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
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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