Pin No.TerminalIn/OutFunction
80VCCIn +5 V source
81GNDIn Ground (0 V) source
82MRDBOut Read enable signal output for the sound source ROM
83 ~ 98MD0 ~ MD15In/Out Data bus
99PLEOut Reset signal output for the DSP
100P17In APO cancellation signal input
DIGITAL SIGNAL PROCESSOR (LSI101: HG51B227FB)
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 contains two I/O
ports, which controls LEDs.
The following table shows the pin functions of LSI101.
Pin No.TerminalIn/OutFunction
1 ~ 4, 80PB0 ~ PB4Out LED drive signal output
5SOOut Serial sound data output for the DAC
6WCKOOut Word clock output for the DAC
7VDD3In +5 V source
8TESTN Not used.
9RESBIn Reset signal input
10VSS2In Ground (0 V) source
11, 12XIN, XOUTIn/Out 16 MHz clock input/output
13WCKIIn Word clock input from the CPU
14SIIn Serial sound data input from the CPU
15BCKIIn Bit clock input from the CPU
16SINCIn 1 MHz synchronizing pulse input
17VDD2In +5 V source
18 ~ 25IO0 ~IO7In/Out Data bus
26RCEBOut Chip enable signal output for the working storage RAM
27VSS3In Ground (0 V) source
28AD1In Address bus
29OEBIn Not used. Connected to +5 V source.
30WEBIn Write enable signal input
31VDD3In +5 V source
32CE2In Chip enable signal input. High active.
33AD0In Address bus
34CE1BIn Chip enable signal input. Low active.
35 ~ 41, 43EIO0 ~EIO7In/Out Data bus for the effect RAM
42 , 44, 46 ~ 48,
EA0 ~ EA12Out Address bus for the effect RAM
51 ~57, 59
45ECEBOut Chip enable signal output for the effect RAM
49EOEBOut Read enable signal output for the effect RAM
N 7 N |
ACEC
