Z89340 datasheet(23/30 Pages) ZILOG

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Z89340

Digital Wavetable Engine

DS96DSP0201

P R E L I M I N A R Y

1-23

Wave Endpoint Lo/

AWS/Interleave Size

address 8

ATFP Flags

bits 0 and 1

These bits are active for the selected envelope types in

Frequency Lo. The bits have a separate meaning for

Tremolo from the other types.

Amplitude/Filter/Pan envelope flag bits:

00-Off

01-Wait

10-In process

11-Done

Tremolo envelope flag bits:

bit 0-Enable

bit 1-Polarity

Interleave Size

bits 2-3

(Wavetable Mode Oscillator only)

With wavetable synthesis, one or more complete periods

of a waveform are stored in a wavetable. Interleave is the

distance between wavetables. Normally Interleave Size

will equal Table Size so that the wavetable will be contigu-

ous. For compatibility with existing sound libraries, other

interleaves are available.

00-64 Samples

01-128 Samples

10-256 Samples

11-512 Samples

AWS

bit 4

(Wavetable Mode Oscillator only)

With wavetable synthesis, one or more complete periods

of a waveform are stored in a wavetable. We Change the

Wave Endpoint when we want to move to the next wavet-

able. How the sound moves from the current wavetable to

the next is controlled by AWS (Automatic Wave Select).

When AWS is 0, the sound loops on the current wavetable

as long as Wave Endpoint equals Wave Pointer. When

Wave Endpoint is changed, the Z89340 jumps to the

wavetable pointed to by Wave Endpoint as soon as it plays

the last sample of the current wavetable pointed to by

Wave Pointer. Wave Pointer is then set equal to Wave

Endpoint. When AWS is 1, all samples in the wavetables

between Wave Pointer and Wave Endpoint are also

played. The Z89340 the loops on the wavetable pointed to

by Wave Endpoint.

ROM5-ROM7

bits 5-7

(Wavetable Mode Oscillator only)

With wavetable synthesis, one or more complete periods

of a waveform are stored in a wavetable. The wavetable

can be played at any desired frequency.

ROM2-ROM7

bits 2-7

(Sample Loop Oscillator only)

For sample loop systems, Wave Endpoint is the last sam-

ple in the sample sequence. When this last sample is

played, the Z89340 subtracts Wave Loop Length from the

Wave Pointer. Note that since only six bits are available for

Wave Endpoint Lo, the sample sequence can only end on

every fourth address. Wave Loop Length does not have

this restriction.

Wave Endpoint Hi

address 9

ROM8-ROM15

bits 0-7

(Refer to Wave Endpoint Lo.)

Wave Loop Length Lo

address A

Table Size

bits 0 and 1

(Wavetable Mode Oscillator only)

With wavetable synthesis, one or more complete periods

of a waveform are stored in a wavetable. Table Size is the

size of the wavetable. Interleave is the distance between

wavetables. Normally Interleave Size will equal Table Size

so that the wavetable will be contiguous. For compatibility

with existing sound libraries, other interleaves are avail-

able.

00-64 Samples

01-128 Samples

10-256 Samples

11-512 Samples

ROM2-ROM7

bits 2-7

(Wavetable Mode Oscillator only)

For Wavetable Mode Oscillators, this should be 0.

ROM0-ROM7

bits 0-7

(Sample Loop Oscillator only)

A sample sequence is played by setting Wave Pointer to

the first sample in the sequence and Wave Endpoint to the

last sample in the sequence. For many sounds, we then

repeat or loop the last portion of the sequence. Wave Loop

Length is the length of the loop.

Wave Loop Length Hi

address B

ROM8-ROM15

bits 0-7

(Refer to Wave Loop Length Lo.)

For Wavetable Mode Oscillators, this should be 0.

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