在作计算器时,出现下列错误,清高手指点 ERROR:HDLParsers:1215 - "e:/xilinx/project4/computer/bcd_add_sub.vhd" Line 75. Prefix clock is type std_ulogic, which is not a record type but Enumeration ERROR:HDLParsers:1217 - "e:/xilinx/project4/computer/bcd_add_sub.vhd" Line 75. Symbol clock can't be used as a prefix in a selected name. ERROR:HDLParsers:1212 - "e:/xilinx/project4/computer/bcd_add_sub.vhd" Line 75. Invalid selected name clock. ERROR:HDLParsers:3324 - "e:/xilinx/project4/computer/bcd_add_sub.vhd" Line 74. IN mode Formal clock of regne with no default value must be associated with an actual value. ERROR:HDLParsers:1215 - "e:/xilinx/project4/computer/bcd_add_sub.vhd" Line 78. Prefix clock is type std_ulogic, which is not a record type but Enumeration ERROR:HDLParsers:1217 - "e:/xilinx/project4/computer/bcd_add_sub.vhd" Line 78. Symbol clock can't be used as a prefix in a selected name. ERROR:HDLParsers:1212 - "e:/xilinx/project4/computer/bcd_add_sub.vhd" Line 78. Invalid selected name clock. ERROR:HDLParsers:3324 - "e:/xilinx/project4/computer/bcd_add_sub.vhd" Line 77. IN mode Formal clock of regne with no default value must be associated with an actual value.
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