如附图所示：
D[7..0]为数据总线低8位。
通过ALTERA自带的373扩展输出IO，A2、A1、A0译码后
提供片选，现在的问题是编译后没有错误，但有好多报警：
Warning: Removed always-enabled tri-state buffer 74373:inst17|67 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst17|68 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst17|69 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst17|70 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst17|71 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst17|72 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst17|73 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst17|74 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst18|67 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst18|68 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst18|69 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst18|70 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst18|71 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst18|72 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst18|73 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst18|74 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst19|67 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst19|68 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst19|69 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst19|70 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst19|71 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst19|72 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst19|73 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst19|74 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst20|67 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst20|68 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst20|69 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst20|70 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst20|71 feeding logic, open-drain buffer or output pin
Warning: Removed always-enabled tri-state buffer 74373:inst20|72 feeding logic, open-drain buffer or output pin
Warning: Node "D0" is assigned to location or region, but does not exist in design
Warning: Node "D1" is assigned to location or region, but does not exist in design
Warning: Node "D2" is assigned to location or region, but does not exist in design
Warning: Node "D3" is assigned to location or region, but does not exist in design
Warning: Node "D4" is assigned to location or region, but does not exist in design
Warning: Node "D5" is assigned to location or region, but does not exist in design
Warning: Node "D6" is assigned to location or region, but does not exist in design
Warning: Node "D7" is assigned to location or region, but does not exist in design
哪位帮忙看看是什么原因啊？
相关链接:https://bbs.21ic.com/upfiles/img/20079/20079211595238.pdf |
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