Re: final cartridge for vic 20

From: Greg King <>
Date: Thu, 10 Sep 2015 10:28:31 -0400
Message-id: <>
On 2015-09-10 1:24 AM, Jim Brain wrote:
> On 9/10/2015 12:11 AM, Nate Lawson wrote:
>> I think the problem is here:
>> ###
>> assign reset_in =                (reset_en ? 0 : !reset); //if soft
>> reset, 0, otherwise !reset
>> register #(.WIDTH(6))                cart_config1_reg(clock, reset_in,
>> cart_config1_reg_ce, data[5:0], cart_config1);  // active high reset.
>> ###
>> If the external reset line goes low (which it does when you set
>> reset_en to do a soft reset), reset_in goes high and the config
>> register is reset. Just stop passing reset_in to the config register
>> and get it from a different source.
> If external reset lines goes low, but I did so with the soft reset
> functionality, then reset_in will be 0, according to the above.  It will
> be that way until the next falling clock, given the always block.

When is the reset line released?  Does it happen _before_ that falling 
clock?  Maybe, you have a race condition on the release:  reset_in sees 
the release before reset does; therefore, it gets a pulse from !reset.

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Received on 2015-09-10 16:00:07

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