Integrated Circuits

6581
Sound Interface Device (SID)
PDF datasheet
       
CAP1A 1  • 28 Vdd
CAP1B 2 27 AUDIO OUT
CAP2A 3 26 EXT IN
CAP2B 4 25 Vcc
RES 5 24 POTX
∅2 6 23 POTY
R/W 7 22 D7
CS 8 21 D6
A0 9 20 D5
A1 10 19 D4
A2 11 18 D3
A3 12 17 D2
A4 13 16 D1
GND 14 15 D0
       
Pin Symbol Description
1 CAP1A capacitor C1 connection
2 CAP1B capacitor C1 connection
3 CAP2A capacitor C2 connection
4 CAP2B capacitor C2 connection
5 RES master reset
6 ∅2 master clock
7 R/W read/write select
8 CS chip select (active low)
9 A0 address bus (register select)
10 A1 address bus (register select)
11 A2 address bus (register select)
12 A3 address bus (register select)
13 A4 address bus (register select)
14 GND ground
15 D0 data bus
16 D1 data bus
17 D2 data bus
18 D3 data bus
19 D4 data bus
20 D5 data bus
21 D6 data bus
22 D7 data bus
23 POTY Y-axis potentiometer input
24 POTX X-axis potentiometer input
25 Vcc +5VDC supply
26 EXT IN external audio input
27 AUDIO OUT audio output
28 Vdd +12VDC supply


Parameter Value Unit
Minimum clock cycle time 1 µs

Notes
  • C1 and C2 are integrating capacitors for the filter; polystyrene capacitors are preferred.
  • C1 and C2 should have the same value. 2200 pF gives good operation over the audio range (30Hz-12kHz).
  • Filter cutoff frequency is approx. 2.6 ×10-5 /C (where C is the value of C1 or C2).
  • POTX and POTY pins must be connected to RC networks; the time constant RC should be 4.7 ×10-4 . Recommended capacitor value is 1000 pF, recommended potentiometer value is 470 k Ω.
  • Maximum audio output level is approx. 3V p-p at a 6V DC level. A 1k Ωresistor should be connected from AUDIO OUT to ground, and a 1-10 µF electrolytic capacitor should be used for AC coupling.
  • Registers:
    $00 Voice 1 frequency low byte
    $01 Voice 1 frequency high byte
    $02 Voice 1 pulse width low byte
    $03 Voice 1 pulse width high byte (bits 3-0)
    $04 Voice 1 control (gate, sync, ring mod, waveform)
    $05 Voice 1 attack/decay rates
    $06 Voice 1 sustain level/release rate
    $07 Voice 2 frequency low byte
    $08 Voice 2 frequency high byte
    $09 Voice 2 pulse width low byte
    $0A Voice 2 pulse width high byte (bits 3-0)
    $0B Voice 2 control (gate, sync, ring mod, waveform)
    $0C Voice 2 attack/decay rates
    $0D Voice 2 sustain level/release rate
    $0E Voice 3 frequency low byte
    $0F Voice 3 frequency high byte
    $10 Voice 3 pulse width low byte
    $11 Voice 3 pulse width high byte (bits 3-0)
    $12 Voice 3 control (gate, sync, ring mod, waveform)
    $13 Voice 3 attack/decay rates
    $14 Voice 3 sustain level/release rate
    $15 Filter cutoff frequency low byte
    $16 Filter cutoff frequency high byte (bits 2-0)
    $17 Filter resonance/control
    $18 Filter mode/volume control
    $19 POTX value (0-255), updated every 512 clock cycles
    $1A POTY value (0-255), updated every 512 clock cycles
    $1B Upper 8 bits of Oscillator 3 value (random number if noise waveform is selected)
    $1C Upper 8 bits of Voice 3 envelope generator value
  • Oscillator frequency = (Fn ×Fclk/16777216) Hz
  • Pulse width = (PWn/40.95) %

Note
Data is maintained by an independent source and accuracy is not guaranteed. Check with the manufacturer's datasheet for up-to-date information.

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