Profile:

Code name: maruCc42 Architect: Yoko Miyoshi (Cofabricator: Sanae Ichikawa and Akiko Fujii) Became operational:Friday, July 31, 1998 Type: pipelined RISC having 3 stages Instructions: two-operand format 16bit-instructions x 14

Special features:

Fully interlocked pipeline External interruption handling (console) Internal interruption handling (overflow) Two's complement arithmetic addition/subtraction

Machine organization:

Registers: 8bit General purpose registers x 3 Logic units: 8 bit ALU x 1 Internal bus: 8 bit x 3 External bus: 16 bit instruction bus x 1, 8 bit data bus x 1 Main Store: 256Byte x 2 (instruction) + 256Byte (data) Maximum CPU frequency: 32MHz(estimated) FPGA: Xilinx4010PG191(using 256 CLBs out of 400) TTL: TI 74 series IC x 25 I/O: 22 switches, 10 LEDs Application program: Euclidean algorithm, LED control

Days taken:

System design: 2 weeks (net: 5 days) CAD: 5 weeks (net: 20 days) Fabrication: 2 weeks (net: 6 man days) Debug: 2 weeks (net: 4 days)

Comments:

It was difficult to control LEDs. A thunderbolt struck our facility. Anyway I satisfied since we could complete.

+++ Please click here for the Japanese version +++

---

Computer Engineering Experiment City-1 in 1998 on Verilog HDL and FPGA

---

Microcomputer Design Educational Environment City-1

---