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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: 86/116頁
文件大小: 787K
代理商: W88227QD
Preliminary/Confidential
Subject to change without notice
W88227F/W88227QD
- 82 -
1999/10/1 Rev: 0.70
DSCL - Decoding Sector Counter - (read 81h)
Once the target header is found, this counter increments when a sector is completely decoded. This counter is
incremental-only, and the value follows FFh is 0. If
DSCEN (80h.6)
is high, flag
DSFULI (80h.r4)
becomes
high if
DSCL (81h,r)
is equal to
DSTL (81h,w)
at the end of EDC-checking. Meanwhile, the decoder stops if
ASTOPB (80h.w3)
is low. This register is cleared to 00h at the falling edge of
DECEN (0Ah,w7)
. The initial
value of DSCL after chip reset, firmware reset and decoder reset is 00h.
DSCH - Obsolete (read 82h)
TSL - Target Search Limit Register - (write 83h)
This register specified the limited number of target search. If
N
is the number specified by this register,
TNFI
(80h.r1)
becomes high if the headers have not match the target after
N
successive sectors. Since this register
will not be changed by decoding operation, there is no need to writing it before every decoding operation. The
initial value of TSL after chip reset, host reset and firmware reset is FFh.
TSC - Target Search Counter - (read 83h)
After the decoder is enabled, the number of sectors has been searched can be monitored by reading TSC. This
register is cleared to 00h at the falling edge of
DECEN (0Ah,w7)
. The initial value of TSC after chip reset,
firmware reset and decoder reset is 00h.
TARGET0 - Target Minute Register - (read/write 84h)
TARGET1 - Target Second Register - (read/write 85h)
TARGET2 - Target Frame Register - (read/write 86h)
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