ISCAS High-Level Models


ISCAS-85 C880 8-Bit ALU

Statistics: 60 inputs; 26 outputs; 383 gates; bus translations

Function: c880 is an 8-bit ALU with the high-level model shown in above. Given the presence of a CLA module in the 74181 ALU, it is not surprising to find a similar module in c880. The core of this 8-bit ALU is an 8-bit 74283-style adder. The multiplexers M1 and M6 are both controlled by module M2 in a fashion reminiscent of horizontal microcode; i.e., an external source must ensure that no more than one function is activated at a time on C(25:0).