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參數(shù)資料
型號: W88227QD
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: LQFP-128
文件頁數(shù): 30/116頁
文件大小: 787K
代理商: W88227QD
Preliminary/Confidential
Subject to change without notice
W88227F/W88227QD
- 26 -
1999/10/1 Rev: 0.70
2.2.4.5 EDC Checking
The EDC checking logic carry 32-bit CRC checking on error corrected data according to its mode. The
checking result can be monitored through flag
CRCOK (0Ch.r7)
. If the result is error, the errors in sector may
exceed the capacity of correction logic and some data might be miscorrected.
2.2.4.6 Real Time EDC Checking
If real time EDC checking logic is enabled by setting
RTEDC (0Ah.w6)
high, the remainder of serial data is
calculated while the sector is being buffered into DRAM. The sector ready interrupt flag
SRIb (01h.r5)
is
immediately activated at next sync if the resultant remainder is zero, i.e., no EDC error. If there is error, the
specified error correction is then applied to the buffered data. This function should not be enabled in disk-
monitor mode.
2.2.4.7 Disc Format Selection
Before enable decoder logic through register
CTRL0 (0Ah,w)
, appropriate value should be set to register
CTRL1
(0Bh.w)
according to different disc format. If
ACEN (0Ah.w4)
and
M2RQ (0Bh.w3)
are both high, the type of
error correction is automatically determined by FORM bit in the subheader byte rather than setting of
F2RQ
(0Bh.w2)
. The value of
ACEN (0Ah.w4)
does not affect the yellow-book mode-1 correction.
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
2.2.4.8 DSP Main Data Format
If
D2EN (1Bh.w3)
is set high, pin C2PO/SDATA2 is used as second serial data input pin. The two-bit format
can dramatically reduce the frequency on DSP main data interface and improve EMI.
DSPSL
07h
0Bh
24h
A3h
C3h
DSP Data Format
Toshiba
Winbond two-bit
Sanyo
Sony 48-bit slot
Philip
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