YMF724 Просмотр технического описания (PDF) - Yamaha Corporation

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YMF724

high performance audio controller for the PCI Bus

Yamaha Corporation 

YMF724F

FUNCTION OVERVIEW

1. PCI INTERFACE

DS-1 supports the PCI bus interface and complies to PCI revision 2.1.

1-1. PCI Bus Command

DS-1 supports the following PCI Bus commands.

1-1-1. Target Device Mode

C/BE[3:0]#

Command

0 0 0 0 Interrupt Acknowledge (not support)

0 0 0 1 Special Cycle (not support)

0 0 1 0 I/O Read

0 0 1 1 I/O Write

0 1 0 0 reserved

0 1 0 1 reserved

0 1 1 0 Memory Read

0 1 1 1 Memory Write

1 0 0 0 reserved

1 0 0 1 reserved

1 0 1 0 Configuration Read

1 0 1 1 Configuration Write

1 1 0 0 Memory Read Multiple (not support)

1 1 0 1 Dual Address Cycle (not support)

1 1 1 0 Memory Read Line (not support)

1 1 1 1 Memory Write and Invalidate (not support)

DS-1 does not assert DEVSEL# when accessed with commands that are indicated as (not supported) or

reserved.

1-1-2. Master Device Mode

C/BE[3:0]#

011

011

Command

0 Memory Read

1 Memory Write

##

When DS-1 becomes a Master Device, it generates only memory write and read cycle commands.

January 14, 1999

-9-

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