Casio CTK-750 manual Digital Signal Processor HG51A115A01FD

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Digital Signal Processor (HG51A115A01FD)

Upon receipt of note numbers and their velocities, the DSP reads sound and velocity data from the sound source ROM in accordance with the selected tone; the DSP can read rhythm data simultaneously when a rythm pattern is selected. Then it provides 16-bit serial signals containing data of the melody, chord, bass, and percussion to the DAC. The DSP also adds the selected effect to the sound data using a 256k-bit RAM.

The following table shows the pin functions of the DSP.

Pin No.

Terminal

In/Out

Function

 

 

 

 

1 ~ 8

CD0 ~ CD7

In/Out

Data bus

 

 

 

 

9, 10

 

 

Not used.

 

 

 

 

11

GND7

In

Ground (0V) source

 

 

 

 

12

CK16

Out

16.384MHz clock output

 

 

 

 

13

VCC6

In

+5V source

 

 

 

 

14

CK0

In

Clock input. Connected to terminal CK16.

 

 

 

 

15

TCKB

 

Not used.

 

 

 

 

16

VCC1

In

+5V source

 

 

 

 

17

GND1

In

Ground (0V) source

 

 

 

 

18, 19

XT0, XT1

In/Out

16.384MHz clock input/output. Connected to a crystal oscillator.

 

 

 

 

20

SGL

In

System control terminal. Single chip system: Open

 

 

 

 

21

CCSB

In

Chip select signal input

 

 

 

 

22 ~ 25

CA0 ~ CA3

In

Addess bus

 

 

 

 

26

CE0

In

Not used. Connected to ground.

 

 

 

 

27

CWRB

In

Write enable signal

 

 

 

 

28

CRDB

In

Read enable signal

 

 

 

 

29 ~ 32

 

 

Not used.

 

 

 

 

33

RESB

In

Reset signal input

 

 

 

 

34

TESB

In

Not used. Connected to +5V.

 

 

 

 

35 ~ 39

 

 

Not used.

 

 

 

 

40 ~ 49

RD0 ~ RD15

In

Data bus for the sound source ROM

52 ~ 57

 

 

 

 

 

 

 

58

RA23

Out

Not used.

 

 

 

 

59

RA22

Out

Chip select signal for the sound source ROM

 

 

 

 

60, 61

RA20, RA21

Out

Not used.

 

 

 

 

62 ~ 73

RA0 ~ RA19

Out

Data bus for the sound source ROM

75 ~ 82

 

 

 

 

 

 

 

74

GND5

In

Ground (0V) source

 

 

 

 

83

WOK2

Out

Word clock output. Not used.

 

 

 

 

84

VCC3

In

+5V source

 

 

 

 

85

GND3

In

Ground (0V) source

 

 

 

 

86

WOK1

Out

Word clock for the DAC

 

 

 

 

87

SOLM

Out

Serial data output. Not used.

 

 

 

 

88

SOLP

Out

Serial data output for the DAC

 

 

 

 

89

BOK

Out

Bit clock output for the DAC

 

 

 

 

90 ~ 92

 

 

Not used.

 

 

 

 

— 8 —

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Contents CTK-750 Contents Specifications GeneralReplacing the DSP HG51A115A01FD ElectricalBlock Diagram UPD6376CXCircuit Description Key MatrixButton Matrix Reset CircuitNomenclature of Keys MidiCPU HD6433298A18P Pin No Terminal In/Out FunctionGate Array UPD65005C-578 Digital Signal Processor HG51A115A01FD Block diagram of DSP and DAC circuit Key Touch LSI HG52E35P Filter Block Name Voltage For operation Power Amplifier LA4620Power Supply Circuit AvddWiring Diagram M5712-CN1MMajor Waveforms Page PCB View and Major Check Points Schematic Diagrams Console PCB M5712-CN1M Keyboard PCBs M615T-KY1M, KY2M Exploded View M5218APR IC Lead Identification and Internal DiagramS8053ANO PC900VEB C E Q2 2SD1762E,F Q4 2SB1274Be C B Parts List N N FOB Japan Code No Parts Name Specification Yen Unit Price Lower Case Screws MA0300941A