LSI Logic Confidential
CD Interface
14-9
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
Configuration register is non-zero. The sector sync bytes consist of
12 bytes of data, with the following hexadecimal values: 00, FF, FF, FF,
FF, FF, FF, FF, FF, FF, FF, 00. The CD Interface must detect the sector
sync consecutively (according to the number specified in the SrchCnt
field of the SD/CD Configuration register) in 2352-byte intervals to
establish valid sector framing before it can start reading the data from
the CD. During data transfer, if the sector sync is not present at the
beginning of a 2352-byte sector, the CD Interface must restart the sector
sync search, and no CD data is read until sector framing is
re-established. If the SrchCnt field in the SD/CD Configuration register is
zero, the pass-through (CD-DA) mode is set, and the CD Interface begins
reading the CD data without a sector sync search.
14.3.1 SD/CD Configuration Register
This register configures the SD/CD interface. The parallel SD interface
can work in synchronous mode. The serial CD interface consists of the
following:
•
A bit clock pin, CD_BCK, used to sample the data
•
A left/right channel clock pin, CD_LRCK, with 16-bit serial data in
each phase to frame data at the 32-bit boundary
•
A data pin, CD_DATA
•
An error pin, CD_C2PO, which indicates errors for each of the 2-byte
data
A 2352-byte sector starts from the left channel.
SD/CD Configuration Register
Cbus Address: 0xFB0050
31
23
22
21
20
19
18
17
16
Reserved
SdInt
Atapi
Rs
TKDe
c
SDWr
Re
EnS-
eSrt
Mode
Srch-
Cnt
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
SrchCnt
SDreq SDack SDclk
SD
Sync
CDG Mode
IDS
No
C2po
BCK
LRclk
C2po
Ord
DatOrd
Wdlen
Содержание DMN-8600
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