Re: Sequential Circuits power up Reset
- From: "john" <conphiloso@xxxxxxxxxxx>
- Date: 30 Jun 2005 10:56:44 -0700
Hi,
The problem is that USB_CLK is not present at the time of the power up.
The USBCLK activates when the user wishes it to activate. So, I was
relying on the power up reset option on the CPLD, but I think its not
working for me!
Thanks
Regards
john
john wrote:
> Hello,
>
> I am having a problem with the power up "Reset" of the 19-bit counter..
> I want it to be "0000 hex", whenever, I power up my system.
> It initializes it self to "0000hex" sometimes and sometimes it does not
> do that. I have attached the code too. Please advice!
>
> Thanks
> Regards
> John.
>
>
> Address_bus<= sec_counter;
> sec_counter<= "0000000000000000000" When Reset_A ='1' Else sec_counter
> + 1 When inc 'Event And inc= '1' And sec_stop ='0';
>
> sec_stop <= '1' When sec_counter(18)='0'and sec_counter(17)='0'and
> sec_counter(16)='0' and
> sec_counter(15)='0'and sec_counter(14)='0'and sec_counter(13)='1' and
> sec_counter(12)='0'and sec_counter(11)='0'and sec_counter(10)='1' and
>
> sec_counter(9)= '0'and sec_counter(8)= '0'and sec_counter(7)='0' and
>
> sec_counter(6) ='0'and sec_counter(5)= '1'and sec_counter(4)='0' and
>
> sec_counter(3)= '0'and sec_counter(2)= '0'and sec_counter(1)='0' and
> sec_counter(0)= '0'
> Else
> '0';
> Process(State)
>
> Begin
>
> Case State is
>
> When E0 =>
> Reset_A <= '1';
> nextstate<= E1;
>
> When E1 =>
> Reset_A <= '0';
> nextstate<= E1;
>
> When Others =>
> Reset_A <= '1';
> nextstate<= E0;
>
>
> End Case;
> End Process;
> ----
>
> Process (State2)
> Begin
>
> Case State2 is
>
>
> When G0=>
> inc<='0';
> Data_Bus ( 13 downto 8) <= USB_Data ( 5 downto 0 );
> UBL <='0';
> LBL <='0';
> nextstate2 <=G1;
>
> When G1 =>
> inc <='0';
> Data_Bus ( 7 downto 0) <= USB_Data ( 7 downto 0 );
> UBL <='0';
> LBL <='0';
>
> nextstate2<=G2;
>
> When G2 =>
> inc <='1';
> Data_Bus ( 13 downto 8) <= USB_Data ( 5 downto 0 );
> UBL <='0';
> LBL <='0';
>
> nextstate2 <=G3;
>
> When G3 =>
> inc <='0';
> Data_Bus ( 7 downto 0) <= USB_Data ( 7 downto 0 );
> UBL <='0';
> LBL <='0';
>
> nextstate2 <=G2;
> When others =>
> nextstate2 <=G0;
>
> End case;
> End Process;
>
> ----
>
> Process (USB_CLK )
> Begin
>
> If (USB_CLK 'Event And USB_CLK = '0')Then
>
> If ( sec_stop= '0') Then
>
> State2 <= nextstate2;
> State <= nextstate;
>
> Else
> State2 <= G0;
> State <= E0;
>
> End If;
>
> End If;
>
> End Process;
.
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