LSI Logic Confidential
1394 Controller
14-15
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
For asynchronous packets (APs) received on the 1394 interface, if the
packet is directed to the current DMN-8600 node, the BIO sends the
packet to the AP’s SDRAM buffer and signals an interrupt at the end of
an isochronous cycle. Software is responsible for further input
processing, including PCR recovery, PTS handling, DVD navigation and
transport section processing, CD descrambling and CRC check,
demultiplexing the DVD/CD and transport data in SDRAM, and copying
the AV bitstreams to proper VBV buffers during vertical blanking interval
(VBI).
For output, DMA channels transfer data from SDRAM to the 1394 and
SD/ATAPI interfaces. In the case of 1394 isochronous output, software
prepares the proper 1394 time stamp in the packet header and
multiplexes packets from different channels. The isochronous packets
optionally pass through the 1394 scrambler and channel filter which can
turn an output channel on and off instantly.
For 1394 output sending MPEG packets, the BIO supports IPs with one
or more source packets, but not with a fraction of a source packet. This
simplifies scrambling/descrambling and output timestamp handling.
For 1394 input receiving MPEG packets, the BIO supports IPs with
fractions of a source packet as well.
Содержание DMN-8600
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