ModuleWare Reference Guide - Hornad

Arithmetic Parts181 ALU (alu181)ovfl= MSB= MSB XOR f(n)if parameter sign_type = unsignedif parameter sign_type = signedTruth TableFor positive polarities. (For negative polarities invert the signals, cin = 0; cin is added only inthe arithmetic mode).Table 6-1. 181 ALU Truth Tablesfs[3],s[2],s[1],s[0] logical (mode =1) arithmetic (mode = 0)0000 NOT(a) a - 10001 NOT(a AND b) a AND b - 10010 NOT(a) OR b a AND NOT(b)0011 1 -10100 NOT(a OR b) a + (a OR NOT(b))0101 NOT(b) (a AND b) + (a OR NOT(b))0110 NOT(a XOR b) a - b - 10111 a OR NOT(b) a + NOT(b)1000 NOT(a) AND b a + (a OR b)1001 a XOR b a + b1010 b (a AND NOT(b)) + (a OR b)1011 a OR b a + b1100 0 a + a1101 a AND NOT(b) (a AND b) + a1110 a AND b (a AND NOT(b)) + a1111 a a100ModuleWare Reference Manual, Library Version 1.9September 18, 2008