Texas Instruments 60X - Manual (Page 70)

4-24 Theory of Operation
Figure 4-11 ES1688 Sound Chip Block Diagram
FIFO
/DMA
Control
Mixer
Register
MPU
401
256-Byte
FIFO
ES1688
Processor
DSP Interface
A/D
& D/A
Control
Analog
Circuit
ISA
Bus
Interface.