Page 514 - DSP Integrated Circuits
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11.10 Bit-Serial Squarers 499
Figure 11.36 Squarer for unsigned or signed-magnitude numbers
The squarer in Figure 11.36 can further be modified to compute the square of
a two's-complement number. An n-bit two's-complement number x can be written
as
To adapt the squarer to this case, we sign-extend a two's-complement number
to at least 2n-l bits and do not clear the SR flip-flops until the next computation is
about to take place. Then, the squarer computes
