LSI Logic Confidential
14-8
Bitstream I/O (Storage) Port
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
request by placing the data on the SD_DATA[7:0] bus and asserting the
SD_ERROR, SD_SECSTART and SD_ACK status signals. The
SD_DATA[7:0] is latched by the SD Interface on the rising edge of
SD_CLK when SD_ACK is high. An error occurs when the SD_DATA is
latched while SD_ERROR is high.
For the write operation, the SD Interface asserts the write request signal
SD_WRREQ when it receives the SD_WR_DATA command from the
host. The SD device must respond to the write request by asserting the
SD_ACK signal. The SD Interface must place the first write data on the
bus when SD_ACK is asserted. The write data is latched by the SD
device during the rising edge of the SD_ACK. The SD Interface can
place the next write data during the falling edge of the SD_CLK.
Figure 14.3 SD Interface Cycle
14.3 CD Interface
Since the CD Interface supports several CD formats (32-bit, 24-bit, 24-bit
IDS, and 16-bit), the host must program the SD/CD Configuration register
to configure the CD Interface to the proper CD format. Once all
parameters in the configuration register are set, the host programs the
READ_CD command and the Go bit in the DVD Control register to
enable the CD Interface.
The CD Interface continues to search for the sector sync bytes, once it
is enabled and the SrchCnt (sector sync search count) in the SD/CD
SD_CLK (I)
SD_ACK (I)
SD_DATA[7:0] (I/O)
SD_WRREQ (O),
SD_RDREQ (O)
SD_ERROR (I),
SD_SECSTART (I/O)
Содержание DMN-8600
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