YMF744B View Datasheet(PDF) - Yamaha Corporation

Part Name

Description

Manufacturer

YMF744B

3.3V; DS-1S high performance audio controller for the PCI bus

Yamaha Corporation 

YMF744B

FUNCTION OVERVIEW

1. PCI INTERFACE

DS-1S supports the PCI bus interface and complies to PCI revision 2.2.

1-1. PCI Bus Command

DS-1S 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-1S 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]#

0110

0111

Command

Memory Read

Memory Write

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

February 3, 1999

-9-

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