仅对英特尔可见 — GUID: sam1438859359241
Ixiasoft
2.3.8. 可编程电流强度
使用可编程电流强度以减缓远距离传输线路或传统背板造成的高信号衰减影响。
注:
要使用可编程电流强度,必须在 Intel® Quartus® Prime软件中指定电流强度约束。如果没有明确的约束, Intel® Quartus® Prime软件就会使用这些预定义的默认值:
- 所有HSTL和SSTL Class I以及所有非电压参考I/O标准 — 50 Ω无校准的RS OCT
- 所有HSTL和SSTL Class II I/O标准 — 25 Ω无校准的RS OCT
- POD12 I/O标准 — 34 Ω无校准的RS OCT
I/O标准 | IOH / IOL电流强度设置(mA) |
|||
---|---|---|---|---|
支持用于FPGA | 支持用于HPS 6 (仅SoC器件) |
|||
可用 | 默认 | 可用 | 默认 | |
3.0 V LVTTL 7 | 24, 20, 16, 12, 8, 4 | 12 | — | — |
3.0 V LVCMOS7 | 16, 12, 8, 4 | 12 | — | — |
2.5 V LVCMOS | 16, 12, 8, 4 | 12 | — | — |
1.8 V LVCMOS | 16, 12, 10, 8, 6, 4, 2 | 12 | 12, 10, 8 | 12 |
1.5 V LVCMOS | 12, 10, 8, 6, 4, 2 | 12 | — | — |
1.2 V LVCMOS | 8, 6, 4, 2 | 8 | — | — |
SSTL-18 Class I | 8, 6, 4 | 8 | — | — |
SSTL-18 Class II | 8 | 8 | — | — |
SSTL-15 Class I | 8, 6, 4 | 8 | — | — |
SSTL-15 Class II | 8 | 8 | — | — |
SSTL-135 | 8, 6, 4 | 8 | — | — |
SSTL-125 | 8, 6, 4 | 8 | — | — |
SSTL-12 | 8, 6, 4 | 8 | — | — |
POD12 | 8, 6, 4 | 8 | — | — |
1.8 V HSTL Class I | 12, 10, 8, 6, 4 | 8 | — | — |
1.8 V HSTL Class II | 14 | 14 | — | — |
1.5 V HSTL Class I | 12, 10, 8, 6, 4 | 8 | — | — |
1.5 V HSTL Class II | 14 | 14 | — | — |
1.2 V HSTL Class I | 8, 6, 4 | 8 | — | — |
Differential SSTL-18 Class I | 8, 6, 4 | 8 | — | — |
Differential SSTL-18 Class II | 8 | 8 | — | — |
Differential SSTL-15 Class I | 8, 6, 4 | 8 | — | — |
Differential SSTL-15 Class II | 8 | 8 | — | — |
Differential SSTL-135 | 12, 10, 8, 6, 4 | 8 | — | — |
Differential SSTL-125 | 12, 10, 8, 6, 4 | 8 | — | — |
Differential SSTL-12 Class I | 12, 10, 8, 6, 4 | 8 | — | — |
Differential POD12 | 8, 6, 4 | 8 | — | — |
Differential 1.8 V HSTL Class I | 12, 10, 8, 6, 4 | 8 | — | — |
Differential 1.8 V HSTL Class II | 14 | 14 | — | — |
Differential 1.5 V HSTL Class I | 12, 10, 8, 6, 4 | 8 | — | — |
Differential 1.5 V HSTL Class II | 14 | 14 | — | — |
Differential 1.2 V HSTL Class I | 8, 6, 4 | 8 | — | — |
注: Intel建议通过执行IBIS或者SPICE仿真来确定用于特定应用的最佳电流强度设置。
6 用于HPS的可编程电流强度信息是初步信息。
7 可编程摆率仅适用于16 mA及以上的电流强度设置。