我的疑问是when的分支是否可以加上begin和end？
case key is
when ''11111110'' =>
begin
p <= 0 ;
q <= 1 ;
end
when ''11111101'' =>
begin
p <= 1 ;
q <= 2 ;
end
when ''11111011'' =>
begin
p <= 2 ;
q <= 3 ;
end
when ''11110111'' =>
begin
p <= 3 ;
q <= 4 ;
end
when ''11101111'' =>
begin
p <= 4 ;
q <= 5 ;
end
when ''11011111'' =>
begin
p <= 5 ;
q <= 6 ;
end
when ''10111111'' =>
begin
p <= 6 ;
q <= 7 ;
end
when ''01111111'' =>
begin
p <= 7 ;
q <= 0 ;
end
when others =>
spken <= '0';
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