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參數資料
| 型號： | 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： | 96/102頁 |
| 文件大小： | 573K |
| 代理商： | W88113C |
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W88113C
Publication Release Date: Mar. 1999
- 92 - Revision 0.61
5.4.15 Remove Frequent SRIb & Automatic Cache Management
Control bit
RMSRI (5Ch.0)
should be set when entering buffer mode and be disabled in decoder_off
routine. When
RMSRI (5Ch.0)
is high, flag
SRIb (01h.r5)
is generated only by
STAERR (80h.r6)
,
LASTBK (80h.r3)
or
HCEI (80h.r0)
.
So after the target is found and buffer-correction mode is enabled, the first interrupt is generated by
LASTBK (80h.r3)
if there is no decoding error. Setting
RMSRI (5Ch.0)
high can reduce the overhead
of microcontroller while the automatic cache management is used.
Since the
SRIb (01h.r5)
interrupt is removed except for erroneous sectors, the cache management
should be implemented through
TCC (9Dh)
. If
TCINCEN (9Ch.5)
is high,
TCC (9Dh)
increments at
the end of EDC-checking if there is no
STAERR (80h.r6)
or
HCEI (80h.r0)
error. If
ACMEN (9Ch.6)
is
high,
TCC (9Dh)
decrements at the end of each data-in block transfer. The transfer of working area
data should be implemented as linear transfer to prevent error.
Writing value to
SKIPC (9Eh)
can be used to implement the cache-partial-hit event. For the cache-
miss event,
TCC (9Dh)
should be set 0.
The stop of DSP buffering is implemented by following setting ininitialization to prevent buffer wrap-
around:
BICCTL (9Ah)
←
B0h
BUFLIM (9Bh)
←
cache_limit
The following figure shows an example flowchart under following conditions:
Buffer-Independent-Correction is enabled
Remove frequent SRIb is enabled in buffer mode
Automatic transfer and cache management is enabled
Linear address transfer for working area data is enabled
In this case, the flag
TENDb (01h.r6)
is generated only when the last block is transferred to host, i.e.,
TTC (9Fh)
is zero.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| W88113CD | 制造商:WINBOND 制造商全稱:Winbond 功能描述:ATAPI CD-ROM DECODER & CONTROLLER |
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