LSI Logic Confidential
4-8
Functional Description
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
4 M x 32 SDR or DDR SDRAMs or two to four 8 M x 16 SDR or DDR
SDRAMs.
The DMN-8600 uses its external SDRAM to store both code and data,
allowing memory allocation to be under complete software control. For
example, when encoding MPEG video, the SDRAM contains:
•
Application program code
•
Video capture buffers for incoming frames
•
Subsampled video buffers used for motion estimation
•
Reconstructed frame buffers for prediction
•
Rate buffers
•
Local tables and other data used by the encoding algorithm
4.4.7
Serial I/O Interface
The DMN-8600 serial I/O (SIO) interface consists of five peripheral
modules: SPI, two UARTs, and two IRs (one IR transmit/receive, one IR
transmit only). All modules interface to the internal bus as well as to a
DMA channel, so they can be used either as programmed I/O or with
DMA transfers.
The UARTs operate in full duplex mode. UART1 supports synchronous
communication as well as hardware flow control using the RTS/CTS
pins.
Note:
UART1 is not available when the external host port is
configured in embedded Host-plus-Limited-Master mode.
The SPI (Serial Peripheral Interface) port provides a bus for serial
devices such as SmartMedia flash cards and EPROM devices. Up to
4 chip selects are supported. The serial bus clock is generated internally.
The user may specify that the last 32-bit word transferred can have
anywhere from 1 to 31 bits (transfers less than1 byte not allowed).
Note:
The SPI port is not available when the external host port is
configured in Host-plus-Limited-Master mode.
The IR (infrared) interface supports both IR receive and IR Blaster
transmit functionality for most consumer electronic IR protocols. This
two-module interface (one IR transmit/receive, one IR transmit only) is
Содержание DMN-8600
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