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
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]#
Command
0
1
1
0
Memory Read
0
1
1
1
Memory Write
When DS-1S becomes a Master Device, it generates only memory write and read cycle commands.