- The Datapath Including Jump and Branch Functions
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The datapath below includes jump (
j) and branch-on-equal (beq) / branch-on-not-equal (bne) functions and additional control signals include:
J,Beq, andBneare for jump and branch instructions.Zerocondition of the ALU is examined for a comparison result.PCSrc=‘1’is for jump and taken branch, where
is from the “PCSrc = J + (Beq·Zero) + [Bne·(¬Zero)]Next PC” as shown in the figure below. The “Next PC” is used to choose between the jump or branch target and the sequential instruction following the current one, where
Imm16is sign-extended to 30 bits and- jump target address is upper 4 bits of PC concatenated with
Imm26.
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