Yamaha YMF724F specifications Function Overview, PCI Bus Command

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]#				Command
0	1	1	0	Memory Read
0	1	1	1	Memory Write

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

September 21, 1998

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