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Chapter 3 SCSP function

3.1 Interface

SCSP has two CPU interfaces (main CPU and sound CPU). Since the priority is higher for the main CPU interface, the processing speed of the sound CPU depends on the operation of the main CPU.

Sound CPU interface

The sound CPU interface is a block that specializes in functions so that the sound CPU can be connected. By providing this interface, it is possible to connect the sound CPU to SCSP without any external circuit.
The sound CPU program exists in the sound memory. For this reason, all CPU programs are placed in the address space of the sound CPU.

Main CPU interface

Figure 3.1 shows the access between the main CPU and the interface.

Figure 3.1 Access Overview

∙ The interface starts when the select signal (MCCSN) from the main CPU falls, and ends when the select signal rises. If "1" is output to the ready signal (MCRDYN) to the main CPU, the select signal (MCCSN) from the main CPU and the data bus (MCD [7: 0]) of the main CPU do not change.

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