LSI Logic Confidential
Interfaces and I/O
4-5
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
The host interface supports two types of read/write protocols:
•
Individual (I) mode
•
Multiplexed (M) mode
In I mode, the decoder requires the host to drive separate signals (RD
and WR) to indicate whether a transfer is a read or a write. In M mode,
the decoder requires one direction signal (RD or WR) and a data strobe.
This selection allows the DMN-8600 to operate with most popular
microcontrollers.
4.4.2
Bitstream/Storage Interface
ATAPI, DVD (SD), CD, and SBP interfaces are multiplexed on a single
interface port.
ATAPI is an asynchronous, 120 ns, 16-bit word interface commonly used
on IDE hard disk drives, CD-R, CD-RW, and DVD recorder drives.
DVD (SD) is an 8-bit word low-level interface to the DSP on consumer
electronics DVD optical loaders. It can process DVD sector data to locate
the header of the 2048-byte pack and perform DVD descrambling on
scrambled sectors. The resulting data is sent to the SDRAM using the
DMA interface.
CD is a serial low-level interface to the DSP on consumer electronics
CD-DA optical loaders. Low bit-rate (1.5 MHz) CD-DA/CD-ROM sector
input coming from the ATAPI or a CD drive’s bit-serial interface is directly
streamed to SDRAM where the DMN-8600 performs sector framing by
locating the sector sync header.
Software is responsible for further input processing, including PCR
recovery, PTS handling, DVD navigation, CD descrambling and CRC
check, demultiplexing the DVD/CD data in SDRAM and copying the AV
bitstreams to proper VBV buffers during a vertical blanking interval (VBI).
For output, DMA channels transfer data from the SDRAM to the
bitstream/storage interfaces. The SBP is a synchronous flow-controlled
8-bit data port. It supports peak transfer rates up to 27 Mbytes/s without
flow control (internal clock at least 4x higher) or 50 Mbyte/s with flow
control. The data transfer flow for the bitstream port is shown in
.
Содержание DMN-8600
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