孕妇吃花生对胎儿有什么好处

71  --keep track of miso/mosi bit counts for data alignmnet
72  PROCESS(ss_n, clk)
73  BEGIN
74    IF(ss_n = '1' OR reset_n = '0') THEN                         --this slave is not selected or being reset
75  bit_cnt <= (conv_integer(NOT cpha) => '1', OTHERS => '0'); --reset miso/mosi bit count
76    ELSE                                                         --this slave is selected
77      IF(rising_edge(clk)) THEN                                  --new bit on miso/mosi
78        bit_cnt <= bit_cnt(d_width+8-1 DOWNTO 0) & '0';          --shift active bit indicator
79      END IF;
80    END IF;
81  END PROCESS;

ERROR:HDLParsers:3375 - "F:/***/src/spi_slave.vhd" Line 75. Choices for an array aggregate (result of operator) must be locally static unless there is only one choice. (LRM 7.3.2.2)