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Designing SOCs with Configured Cores by Steve Leibson

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10.6. Direct Input and Output Ports

Two of the Diamond 570T CPU core’s unique features are its 32-bit direct input and output ports, which are the same I/O ports found on the Diamond 108Mini processor core. The input and output wires on these ports connect directly to special software-visible registers in the processor core and can be used for general-purpose signaling, interrupt generation, serial communications, pulse-width modulation, and other sorts of status and control functions on the SOC. Special instructions read and manipulate the contents of these port registers. Table 10.6 lists these port instructions.

Table 10.6. Input- and output-port register instructions
InstructionDefinition
CLRB_EXPSTATEClear any bit in the output-port register. ...

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