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Konami K053260

Summary

4 voice DPCM or PCM
- 8 bit signed PCM or 4 bit DPCM (unique type)
- total accessible memory: 2 MByte, 64 KByte per sample
CPU to CPU Communication
CPU can be accessible k053260 memory through voice register
2 Stereo sound input, 1 Stereo output (YM3012 DAC compatible)

Source code

k053260.hpp: Base header
- k053260.cpp: Source emulation core

Description

It's one of Konami's custom PCM playback chip with CPU to CPU communication feature, and built in timer.

It's architecture is successed from K007232, but it features various enhancements:

it's expanded to 4 channels, Supports more memory space, 4 bit DPCM, Built in volume and stereo panning support, and Dual chip configurations.

There's 2 stereo inputs and single stereo output, Both format is YM3012 compatible.

Register layout

Address Bits      R/W Description
        7654 3210

00...03 Communication Registers

00      xxxx xxxx R   Answer from host CPU LSB
01      xxxx xxxx R   Answer from host CPU MSB

02      xxxx xxxx   W Reply to host CPU LSB
03      xxxx xxxx   W Reply to host CPU MSB

08...0f Voice 0 Register

08      xxxx xxxx   W Pitch bit 0-7
09      ---- xxxx   W Pitch bit 8-11

0a      xxxx xxxx   W Source length bit 0-7 (byte wide)
0b      xxxx xxxx   W Source length bit 8-15 (byte wide)

0c      xxxx xxxx   W Start address/ROM readback base bit 0-7
0d      xxxx xxxx   W Start address/ROM readback base bit 8-15
0e      ---x xxxx   W Start address/ROM readback base bit 16-20

0f      -xxx xxxx   W Volume

10...17 Voice 1 Register
18...1f Voice 2 Register
20...27 Voice 3 Register

28      ---- x---   W Voice 3 Key on/off trigger
        ---- -x--   W Voice 2 Key on/off trigger
        ---- --x-   W Voice 1 Key on/off trigger
        ---- ---x   W Voice 0 Key on/off trigger

29      ---- x--- R   Voice 3 busy
        ---- -x-- R   Voice 2 busy
        ---- --x- R   Voice 1 busy
        ---- ---x R   Voice 0 busy

2a      x--- ----   W Voice 3 source format
        0--- ----     8 bit signed PCM
        1--- ----     4 bit ADPCM
        -x-- ----   W Voice 2 source format
        --x- ----   W Voice 1 source format
        ---x ----   W Voice 0 source format

        ---- x---   W Voice 3 Loop enable
        ---- -x--   W Voice 2 Loop enable
        ---- --x-   W Voice 1 Loop enable
        ---- ---x   W Voice 0 Loop enable

2c      --xx x---   W Voice 1 Pan angle in degrees*1
        --00 0---     Mute
        --00 1---     0 degrees
        --01 0---     24 degrees
        --01 1---     35 degrees
        --10 0---     45 degrees
        --10 1---     55 degrees
        --11 0---     66 degrees
        --11 1---     90 degrees
        ---- -xxx   W Voice 0 Pan angle in degrees*1

2d      --xx x---   W Voice 3 Pan angle in degrees*1
        ---- -xxx   W Voice 2 Pan angle in degrees*1

2e      xxxx xxxx R   ROM readback (use Voice 0 register)

2f      ---- x---   W AUX2 input enable
        ---- -x--   W AUX1 input enable
        ---- --x-   W Sound enable
        ---- ---x   W ROM readbank enable

*1 Actually fomula unknown, Use floating point type until explained that.

Frequency calculation

 Frequency: Input clock / (4096 - Pitch)

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