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參數(shù)資料
型號: W88227QD
廠商: WINBOND ELECTRONICS CORP
元件分類: 消費(fèi)家電
英文描述: ATAPI CD-ROM Decoder(支持ATAPI標(biāo)準(zhǔn)的CD-ROM解碼器)
中文描述: SPECIALTY CONSUMER CIRCUIT, PQFP128
封裝: LQFP-128
文件頁數(shù): 21/116頁
文件大小: 787K
代理商: W88227QD
Preliminary/Confidential
Subject to change without notice
W88227F/W88227QD
- 17 -
1999/10/1 Rev: 0.70
2.2 Decoder Function
2.2.1 DRAM Interface
2.2.1.1 Memory Layout
The whole DRAM can be divided into Sector
Data Area
and
Working Area
. Sectors from DSP are buffered
into Sector Data Area and then are retrieved for ECC/EDC operation. Some information is stored in working
area for transfer to host on request, for example, TOC.
Sector data buffering is a block-based ring operation. If the decoded-block-number in
DDBH/L (29h/28h)
is
N
- 1
, the sector is buffered into block with number
N
. The decoded-block-number is automatically incremented
by one at each sync. When the decoded-block-number equals the value in
WBRCH/L (57h/56h)
, the sector is
buffered into the block with number specified by
WBRBH/L (55h/54h)
.
The data transfer is also a block-based ring operation if multi-block-transfer is used. The transfer ring is
controlled by
DTRCH/L (53h/52h)
and
DTRBH/L (51h/50h)
. The buffer ring and transfer ring are usually
defined in the same range.
Ring Ceiling
Ring Base
Working
Area
Sector
Data
Area
block number
wrap around
block size is
A00h if RLC=3
or
C00h if RLC=2
Ring Ceiling = 2Fh
Ring Base = 00h
block #2Fh
block #00h
block #2Dh
block #01h
1FFFFh
1E000h
1D600h
00000h
00A00h
01400h
Example: 128K x 8, RLC[1:0](2Bh.1-0) = 3
Illustration Diagram for Memory Layout
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