差别
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supply1 [2018/09/14 16:11] group001 创建 |
supply1 [2018/09/17 08:41] (当前版本) group001 |
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| 行 2: | 行 2: | ||
| supply1 vdd; | supply1 vdd; | ||
| supply0 gnd; | supply0 gnd; | ||
| + | 强度值（Strengths）\\ | ||
| + | 有强度的网络可以使模块更加精确。\\ | ||
| + | \\ | ||
| + | 语法\\ | ||
| + | <code verilog> | ||
| + | ( strength0 [, strength1 ] ) | ( strength1 [, strength0 ] ) | cap_strength | ||
| + | strength0 = highz0 | pull0 | strong0 | supply0 | weak0 | ||
| + | strength1 = highz1 | pull1 | strong1 | supply1 | weak1 | ||
| + | cap_strength = large | medium | small | ||
| + | </code> | ||
| + | 强度表如下：\\ | ||
| + | Strength level\\ | ||
| + | ^ Strength level ^ Name ^ Keyword ^ | ||
| + | ^ 7 | Supply drive | supply0 , supply1 | | ||
| + | ^ 6 | Strong drive | strong0 , strong1 | | ||
| + | ^ 5 | Pull drive | pull0 , pull1 | | ||
| + | ^ 4 | Large capacitive | large | | ||
| + | ^ 3 | Weak drive | weak0 , weak1 | | ||
| + | ^ 2 |Medium capacitive |medium | | ||
| + | ^ 1 | Small capacitive | small | | ||
| + | ^ 0 | High impedance | highz0 , highz1 | | ||
| + | |||
| + | 例程\\ | ||
| + | <code verilog> | ||
| + | and (strong1, weak0) u1 (Q, A, B); | ||
| + | trireg (small) C1; | ||
| + | assign (weak1, strong0) Q = A + B; | ||
| + | </code> | ||