Texas Instruments Extensa 60x Series Maintenance Manual page 70

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