ASSIGNMENT------>DEVICE

在设计的配置里可以设置

看Alteara的例子

Table 10. MAX 3000A Device Recommended Operating Conditions

Symbol Parameter Conditions Min Max Unit

VCCINT Supply voltage for internal logic and

input buffers

(10) 3.0 3.6 V

VCCIO Supply voltage for output drivers,

3.3–V operation

3.0 3.6 V

Supply voltage for output drivers,

2.5–V operation

2.3 2.7 V

VCCISP Supply voltage during ISP 3.0 3.6 V

VI Input voltage (3) –0.5 5.75 V

VO Output voltage 0 VCCIO V

约束文件中也可以加的吧

约束中的选择的管脚有对应的电平吧

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