YMF721
PIN DESCRIPTION
ISA bus interface : 19 pins
Pin name
ADB7-0
A2-0
/MPUCS
/OPLCS
/IOW
/IOR
RST
AIRQ
ABDIR
ARDY
MIDI interface : 2 pins
Pin name
RXD
FSP
pins
1
1
I/O
I
I
Type
TTL
TTL
Size
-
-
Function
MIDI serial data input
Selection of MIDI serial/parallel transmission
(“H” : Parallel, “L” : Serial)
pins
8
3
1
1
1
1
1
1
1
1
I/O
I/O
I
I
I
I
I
I
O
O
OD
Type
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
TTL
Size
2mA
-
-
-
-
-
-
2mA
2mA
12mA
Function
Data bus
Address bus
MPU401 chip select
FM/Wavetable/Command/Control chip select
Write enable
Read enable
Initial clear input
Interrupt signal ("H" : Interrupt)
Selection of data transfer direction
(“L” : YMF721®Host)
I/O channel ready/busy selection ("L" : Busy)
Serial audio interface : 8 pins
Pin name
CLKO
BCO
LRO
WCO
DO3
DO2
DO1
DO0
pins
1
1
1
1
1
1
1
1
I/O
O
O
O
O
O
O
O
O
Type
CMOS
CMOS
CMOS
CMOS
CMOS
CMOS
CMOS
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
LSI [ LSI COMPUTER SYSTEMS ]
