CSE 378 Spring 2007

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Wiring Units Module: extender This unit takes an input of one bit width and produces an output of a larger bit width. The intended use is to perform extension task on the immediate portion of instructions. The CTL signal determines how the extension is performed.  The module performs the following operations: zero extension - fills in required bits with 0's sign extension - maintain the sign of the number left alignment - make the msb of the input the msb of the output ( equivalent to left-shift by O_WIDTH - I_WIDTH bits) shift amount extraction - shift the input right 6 bits and mask with 0x1F (extracts the shamt field from R-Format instructions ) Parameters:   Name Default Description ALIGN_L 2'b10 Value to input to CTL for left alignment DIFF 16 Difference in width between input and output ports GET_SHIFT 2'b11 Value to input to CTL for getting shift amount SIGN_EX 2'b01 Value to input to CTL for sign extension ZERO_EX 2'b0 Value to input to CTL for zero extension Port Description:   Name Dir Width Description IN In 16 input bits CTL In 2 controls the type of transformation OUT Out 32 shifted output bits Symbols:

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