Table of Contents
Advertisement
Pin No.
Terminal
80
VCC
81
GND
82
MRDB
83 ~ 98
MD0 ~ MD15
99
PLE
100
P17
DIGITAL SIGNAL PROCESSOR (LSI2: HG51B227FB-1)
The DSP receives 16-bit serial sound data output from the CPU and adds the selected effect to the sound data
using the effect RAM. Then the DSP provides the sound data to the DAC. The DSP also controls button input/
output.
The following table shows the pin functions of LSI2.
Pin No.
1 ~ 3, 80
PB0 ~ PB3
4
5
6
7
8
9
10
11, 12
XIN, XOUT
13
14
15
16
17
18 ~ 25
IO0 ~ IO7
26
27
28
29
30
31
32
33
34
35 ~ 41, 43
EIO0 ~ EIO7
In/Out
In
+5 V source
In
Ground (0 V) source
Out
Read enable signal output for the sound source ROM
In/Out
Data bus
Out
Reset signal output for the DSP
In/Out
Data bus for the LCD driver
Terminal
In/Out
In
Button input terminals
PB4
In
ASSIGNABLE Jack input
SO
Out
Serial sound data output for the DAC
WCKO
Out
Word clock output for the DAC
VDD3
In
+5 V source
TEST
—
Not used
RESB
In
Reset signal input
VSS2
In
Ground (0 V) source
In/Out
20 MHz clock input/output
WCKI
In
Word clock input from the CPU
SI
In
Serial sound data input from the CPU
BCKI
In
Bit clock input from the CPU
SINC
In
1 MHz synchronizing pulse input
VDD2
In
+5 V source
In/Out
Data bus
RCEB
Out
Chip enable signal output for the working storage RAM
VSS3
In
Ground (0 V) source
AD1
In
Address bus
OEB
Out
Output enable signal for working storage RAM
WEB
In
Write enable signal
VDD3
In
+5 V source
CE2
In
Chip enable signal input. High active.
AD0
In
Address bus
CE1B
In
Chip enable signal input. Low active.
In/Out
Data bus for the effect RAM
Function
Function
— 7 —
Hide quick links:
Advertisement
Table of Contents
