On-Chip Communication Architectures

260 CHAPTER 7 Encoding Techniques for On-Chip CA

Gray and T0 schemes, it relies heavily on certain assumptions of the patterns in

the stream. If the data access policy is not array based, or if the number of working

zones is too large, the scheme loses its effectiveness. Like the T0 code, the scheme

also requires an additional wire for communicating a working zone change.

The Pyramid code proposed by Cheng and pedram [16, 17] reduces switch-

ing activity on Dynamic RAM (DRAM) address buses. DRAM is often laid out in a

2-D array. To identify a cell in the array, two addresses are needed—row and column.

These addresses are usually multiplexed—the ...