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Functions of GDI technique_
| Input | Output | Function | ||
|---|---|---|---|---|
| G | P | N | ||
| A | B | ‘1’ | A + B | OR |
| A | ‘0’ | B | A·B | AND |
| A | B | C |
| MUX |
| A | ‘1’ | ‘0’ | NOT | |
Truth table of DFFSR operation_
| RN | SN | D | CK | Q[n+1] | QN[n+1] |
|---|---|---|---|---|---|
| 0 | 0 | X | X | 0 | 1 |
| 1 | 0 | X | X | 1 | 0 |
| 0 | 0 | X | X | 1 | 0 |
| 1 | 1 | 0 | ↑ | 0 | 1 |
| 1 | 1 | 1 | ↑ | 1 | 0 |
| 1 | 1 | X | ↓ | Q[n] | QN[n] |
Summary of 64 bit counter P&R_
| DFFSR_C | DFFSR_G | |
|---|---|---|
| Number of I/O ports | 131 | |
| Number of nets | 390 | |
| Number of cells | 196 | |
| Combinational area (µm2) | 4301.0 | 4301.0 |
| Noncombinational area (µm2) | 5535.1 | 4317.4 |
| Total cell area (µm2) | 9836.2 | 8618.4 |
Summary of DFFSR performance comparison_
| Number of MOS TR. | clk_q_tplh (sec) | clk_q_tphl (sec) | average (sec) | power_avg (uW/MHz) | |
|---|---|---|---|---|---|
| DFFSR_C | 42 | 3.60E-10 | 3.17E-10 | 3.39E-10 | 0.211 |
| DFFSR_G | 28 | 5.97E-10 | 6.04E-10 | 6.00E-10 | 0.205 |
| Improvement | 33% | –77% | 3% |