YMF754-R datasheet(9/60 Pages) YAMAHA

9 / 60 page

YMF754

June 28, 1999

-9-

FUNCTION OVERVIEW

1. PCI INTERFACE

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

1-1. PCI Bus Command

DS-1E supports the following PCI Bus commands.

1-1-1. Target Device Mode

C/BE[3:0]#

Command

0000

Interrupt Acknowledge (not support)

0001

Special Cycle (not support)

0010

I/O Read

0011

I/O Write

0100

reserved

0101

reserved

0110

Memory Read

0111

Memory Write

1000

reserved

1001

reserved

1010

Configuration Read

1011

Configuration Write

1100

Memory Read Multiple (alias to memory read)

1101

Dual Address Cycle (not support)

1110

Memory Read Line (alias to memory read)

1111

Memory Write and Invalidate (alias to memory write)

DS-1E 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]#

Command

0110

Memory Read

0111

Memory Write

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

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