LSI Logic Confidential
SD Interface
14-7
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
Int
1
ATAPI Interrupt. 1 = generate an ATAPI Completion
interrupt when the specified command is complete (for
transfer commands, completion includes transferring the
specified number of sectors). 0 = no interrupt.
Go
0
1 = start a new command. 0 = previous command is
finished. When software sets the Go bit to 1, the
command specified in the Cmd field is started. When the
BIO completes the command, it resets the Go bit to 0
automatically. If software resets the Go bit to 0 before a
command is completed, the command is aborted from
the BIO’s point of view. When any command is in
progress, writing to this register with Go = 1 is ignored.
On reset, Go = 0.
14.2 SD Interface
The SD Interface is used to read data from and write data to the DVD
drives. The SD interface supports synchronous operations, with the
SD synchronous read and write timing diagrams shown in
For the read operation, the SD Interface asserts the read request signal
SD_RDREQ when it receives the SD_DECS_BS or SD_DESC_NO
command from the host. The SD device must respond to the read
READ_CD
1001
Read a specified number of CD
sectors; starts with sector sync
search if DVDcfg.SearchCnt is non-
zero.
ATAPI_WR_DATA
1010
Write a specified number of DVD
sectors in SDRAM to the ATAPI
interface.
SD_WR_DATA
1011
Write a specified number of generic
sectors in SDRAM to the SD
interface with variable sector length.
SD_RD_DATA
1100
Read a specified number of non-
DVD sectors with variable sector
length. No descrambling is
performed.
Command
BIts
Used
Description
Содержание DMN-8600
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