LSI Logic Confidential
4-4
Functional Description
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
4.4.1
Host Interface
The generic host interface provides a simple, efficient, low-cost interface
to a 16-bit or 32-bit host microcontroller. Three embedded host/async
master configurations are supported: async master only, embedded host
only, and embedded host plus limited master. The configurable storage
and default serial I/O configurations for each of these interfaces are
shown in
When embedded host plus limited master is selected, the serial I/O pins
for UART1, SPI and IR transmit are replaced by the master control pins
M_A[26:22, 5:1], M_CS[0], M_OE, M_WE. The master interface
M_A[21:6]/M_D[15:0] pins are shared with ATAPI_DATA[15:0] pins when
the storage interface is in ATAPI mode, and SD_DATA[7:0]/
SBP_DATA[7:0] when the storage interface is in SD mode.
The limited master is primarily intended to support an external PROM
accessed independently of the host processor. Consequently, it only
supports one chip select with self-paced cycles.
The host interface provides three distinct functions:
•
Local SDRAM access
•
Internal register access
•
Compressed data input /output (if the dedicated bitstream interfaces
are not used for this purpose)
The host communication functions include initializing the DMN-8600,
downloading microcode to the local SDRAM, sending commands,
monitoring status, and downloading graphics data such as OSD bitmaps.
Table 4.1
DMN-8600 Storage and Serial I/O Selection
Embedded Host
Embedded Host
plus Limited Master Embedded Master
Storage
ATAPI or
SD and SBP or
CD and SBP
ATAPI or
SD or
SBP
ATAPI or
SD and SBP
or CD and SBP
Serial I/O
UART2, IDC, IRRX
UART2, IDC, IRRX
UART2, IDC, IRRX
UART1, SPI, IRTX
UART1, SPI, IRTX
Содержание DMN-8600
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