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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: 45/116頁
文件大小: 787K
代理商: W88227QD
Preliminary/Confidential
Subject to change without notice
W88227F/W88227QD
- 41 -
1999/10/1 Rev: 0.70
THTRG - Transfer to Host Trigger Register - (write 06h)
This register is used to trigger data transfer regardless of what value is written. If
DINB (1Fh.1)
is low,
triggering this register automatically fills the Data FIFO and then flag
DFRDYb (01h.r1)
becomes active-low
when the Data FIFO becomes ready. If
DINB (1Fh.1)
is high, data-out transfer is enabled, e.g., parameter of
mode-select command. A more convenient way is set
ADTT (17h.w2)
high and then trigger hardware data
transfer sequence.
TACK - Transfer Acknowledge - (write 07h)
Writing any value to this register deactivates flag
TENDb (01h.r6)
and its corresponding interrupt.
HEAD0 to HEAD3 - Header Registers - (read 03h to 07h)
These four registers are used to hold the information of Header Bytes of each sector. Header Registers should
be read soon after
STAVAb (0Fh.r7)
becomes active-low. Note that the header bytes are distrustful if wrong
mode is set while ECC is enabled. If bit
SHDEN (0Bh.w0)
is enabled, registers
HEAD0-3
are used to hold
subheader bytes instead.
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 Q-channel
(CONTROL and ADR) or 0xFFh if CRC checking of Q-code is erroneous.
BIAL/BIAH - Buffering Initial Address - (write 08h/09h)
The rule for configuration is that the first byte of the sector is stored at
BIAH/L(09h/08h) - 0Ch
Before enabling the external RAM buffering through
CTRL0 (0Ah,w)
,
BIAH/L
should be set to control the
location of the first byte follows data sync for each data sector. The RAM block for buffering is controlled by
the number in registers
DDBH/L(29h/28h)
plus one.
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