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YMF744B
February 3, 1999
-9-
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
0000Interrupt Acknowledge (not support)
0001Special Cycle (not support)
0010I/O Read
0011I/O Write
0100reserved
0101reserved
0110Memory Read
0111Memory Write
1000reserved
1001reserved
1010Configuration Read
1011Configuration Write
1100Memory Read Multiple (not support)
1101Dual Address Cycle (not support)
1110Memory Read Line (not support)
1111Memory 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]# Command
0110Memory Read
0111Memory Write
When DS-1S becomes a Master Device, it generates only memory write and read cycle commands.