YMF721 Datasheet, PDF (3/41 Pages) LSI Computer Systems – FM + Wavetable Synthesizer LSI

YMF721
PIN DESCRIPTION
ISA bus interface : 19 pins
Pin name
pins I/O Type Size Function
ADB7-0
8
I/O TTL 2mA Data bus
A2-0
3
I TTL
- Address bus
/MPUCS
1
I TTL
- MPU401 chip select
/OPLCS
1
I TTL
- FM/Wavetable/Command/Control chip select
/IOW
1
I TTL
- Write enable
/IOR
1
I TTL
- Read enable
RST
1
I TTL
- Initial clear input
AIRQ
1
O TTL 2mA Interrupt signal ("H" : Interrupt)
ABDIR
1
O TTL 2mA Selection of data transfer direction
(“L” : YMF721®Host)
ARDY
1
OD TTL 12mA I/O channel ready/busy selection ("L" : Busy)
MIDI interface : 2 pins
Pin name
pins
RXD
1
FSP
1
I/O Type
I TTL
I TTL
Size Function
- MIDI serial data input
- Selection of MIDI serial/parallel transmission
(“H” : Parallel, “L” : Serial)
Serial audio interface : 8 pins
Pin name
pins I/O Type
CLKO
1
O CMOS
BCO
1
O CMOS
LRO
1
O CMOS
WCO
1
O CMOS
DO3
1
O CMOS
DO2
1
O CMOS
DO1
1
O CMOS
DO0
1
O CMOS
Size
8mA
2mA
2mA
2mA
2mA
2mA
2mA
2mA
Function
Clock output (384fs = 16.9344MHz)
Bit clock output (48fs = 2.1168MHz)
L/R clock output (fs = 44.1kHz)
Word clock output (2fs = 88.2kHz)
Effect send output
MIX (FM + Wavetable) output
Wavetable output
FM output
-3-
July 10, 1997