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请教 一下下面的警告:非常感谢!
1.Warning (10272): Verilog HDL Case Statement warning at usb.v(86): case item expression covers a value already covered by a previous case item
2.Warning (10235): Verilog HDL Always Construct warning at usb.v(72): variable "readMem" is read inside the Always Construct but isn't in the Always Construct's Event Control
3.Warning: Using design file fifo1.v, which is not specified as a design file for the current project, but contains definitions for 1 design units and 1 entities in project(fifo1是文中的一相FIFO模块,fifo1.v应该是自动产生的)
4.Warning: The following nodes have both tri-state and non-tri-state drivers
Warning: TRI or OPNDRN buffers permanently enabled
Warning: Following 16 pins have no output enable or a GND or VCC output enable - later changes to this connectivity may change fitting results(这三个都是关于FD[15:0],这个数据线reg型,inout型。) |
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