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參數資料
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: 47/116頁
文件大?。?/td> 787K
代理商: W88227QD
Preliminary/Confidential
Subject to change without notice
W88227F/W88227QD
- 43 -
1999/10/1 Rev: 0.70
Bit 1:
QCEN - Q-codeword Correction Enable
When this bit is high, Q-codeword RSPC correction logic is enabled. Change of this bit takes effect
after next sync.
Bit 0:
PCEN - P-codeword Correction Enable
When this bit is high, P-codeword RSPC correction logic is enabled. Change of this bit takes effect
after next sync.
DECEN
0Ah.7
BUFEN
0Ah.2
EDCEN
0Ah.5
QCEN
0Ah.1
PCEN
0Ah.0
Decoder
Mode
Operation
Flow
Remark
1
1
1
1
1
Q-P correction
Q
P
CRC
Q
CRC
P
CRC
1
1
1
1
0
Q-correction
1
1
1
0
1
P-correction
1
1
1
0
0
Buffer-only
CRC
1
1
0
0
0
Buffer-only
no CRC check
for M2F2 data
without EDC
1
0
0
0
0
Disk-monitor
no buffering
0
X
X
X
X
Decoder disable
no operation
Note
that if
ATMSEN (9Ah.6)
is high, the decoder logic will operate in Disk-monitor mode before the target is
found. When the target is found, the setting of register
CTRL1 (0Bh,w)
will be automatically loaded into
decoder logic.
CTRL1 - Control Register 1 - (read/write 0Bh)
This register is 0 after chip reset, host reset, firmware reset and decoder reset.
Bit 7:
SIEN - Sync Insertion Enable
When this bit is high, the sector boundary is determined by internal sync insertion logic.
Bit 6:
SDEN - Sync Detection Enable
When this bit is high, the sector boundary is determined by sync bytes of incoming serial data. This
bit should not set for reading CD-DA data.
Bit 5:
DSCREN - Descramble Enable
Setting this bit is high enables the descramble logic. This bit should not set for reading CD-DA data.
Bit 4:
CWEN - Corrected Data Write Enable
Setting this bit high enables corrected data to be written to the external RAM. This bit is normally set
when correction is enabled by
QCEN (0Ah.w1)
or
PCEN (0AH.w0)
.
M2RQ - Mode 2 ECC Request
Bit 3:
Setting this bit to high enables the CD-ROM XA mode 2 correction logic. Yellow book Mode 1
correction will be performed if this bit is low.
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