Sequential Circuits power up Reset

J

john

Guest
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;
 
Hello,
I am talking about real hardware behaviour.

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;
Click to expand...
 
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;
Click to expand...
 
john wrote:
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!
Click to expand...
What Jonathan said. Your code is a nightmare, and would never pass a
real code review.

-a
 
Hello,

Thank you very much for your reply! I tested most of the code with the
real hardware. The reason is that I use Prochip ( Atmel) software for
their chips and their simulation software sucks.
If I add additional clock to the circuitry and reset it on that clock,
will it solve the problem. Now, the CPLD is working on the USB_CLK
which is not activated when the CPLD gets powered up but a continuous
clock at the power up will reset the CPLD. Would you please advice 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;
Click to expand...
 
Hello,

yes, you are correct. I do not have an External Reset option or pin. I
can not have it and thats why I am trying to reset it with a state
machine running on the USB_CLK which coming from the computer and its
not there when I powerup my CPLD, there is no microprocessor or
anything else which provides my CPLD an external powerup RESET. So, I
was thinking that if I have another state machine working on a some
other continuous clock source which is present at the time of the
powerup of the CPLD can RESET the state machine working on USB_CLK.
Please advice me !
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;
Click to expand...
 
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