Electrical computers and digital processing systems: processing – Instruction decoding – Decoding instruction to accommodate variable length...
Reexamination Certificate
2005-05-31
2005-05-31
Pan, Daniel H. (Department: 2183)
Electrical computers and digital processing systems: processing
Instruction decoding
Decoding instruction to accommodate variable length...
C712S223000, C712S221000, C712S036000, C711S212000, C710S307000, C713S323000, C708S205000, C708S209000, C708S503000, C708S504000
Reexamination Certificate
active
06901503
ABSTRACT:
An integrated circuit contains a microprocessor core, program memory and separate data storage, together with analog and digital signal processing circuitry. The ALU is 16 bits wide, but a 32-bit shift unit is provided, using a pair of 16-bit registers. The processor has a fixed length instruction format, with an instruction set including multiply and divide operations which use the shift unit over several cycles. No interrupts are provided. external pins of the integrated circuit allow for single stepping and other debug operations, and a serial interface (SIF) which allows external communication of test dat or working data as necessary. The serial interface has four wires (SERIN, SEROUT, SERCLK, SERLOADB), allowing handshaking with a master apparatus, and allowing direct access to the memory space of the processor core, without specific program control. Within each processor cycle, the processor circuitry is divided into plural stages, and latches are interposed between the stages to minimize power consumption.
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Barlow Stephen John
Collier James Digby
Morfey Alistair Guy
Cambridge Consultants Ltd.
Pan Daniel H.
Schwegman Lundberg Woessner & Kluth P.A.
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