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YMF721 Datasheet(PDF) 3 Page - LSI Computer Systems

Part # YMF721
Description  FM Wavetable Synthesizer LSI
PDF  41 Pages
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Manufacturer  LSI [LSI Computer Systems]
Direct Link  http://www.lsicsi.com
Logo LSI - LSI Computer Systems

YMF721 Datasheet(HTML) 3 Page - LSI Computer Systems

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YMF721
July 10, 1997
- 3 -
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
I/O
Type
Size
Function
RXD
1
I
TTL
-
MIDI serial data input
FSP
1
I
TTL
-
Selection of MIDI serial/parallel transmission
(“H” : Parallel, “L” : Serial)
Serial audio interface : 8 pins
Pin name
pins
I/O
Type
Size
Function
CLKO
1
O
CMOS
8mA
Clock output (384fs = 16.9344MHz)
BCO
1
O
CMOS
2mA
Bit clock output (48fs = 2.1168MHz)
LRO
1
O
CMOS
2mA
L/R clock output (fs = 44.1kHz)
WCO
1
O
CMOS
2mA
Word clock output (2fs = 88.2kHz)
DO3
1
O
CMOS
2mA
Effect send output
DO2
1
O
CMOS
2mA
MIX (FM + Wavetable) output
DO1
1
O
CMOS
2mA
Wavetable output
DO0
1
O
CMOS
2mA
FM output



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