RE: 6510 CPU extensions

From: Gideon Zweijtzer (
Date: 2002-04-22 10:58:03

  • Next message: John : "Re: 6510 CPU extensions"
    |I tried to post this e-question before, but my sender-address was wrong,
    |therefore the e-mail was bounced. This one should work...
    |What did you do with the two-phase clock ?
    Some documentation on the 6510 states that the chip needs two
    non-overlapping clocks. Ruud Baltissen pointed out that this is *NOT* true;
    the CPU just outputs its input clock (PHI1) with some delay to the output
    PHI2. [I found some other documentation that confirmed this.] I make this
    PHI2 clock by filtering (and thus delaying) PHI1 and feeding it into the
    FPGA. The FPGA outputs it to the PHI2 pin. Internally I use the inverse
    clock to run all the state machines (that is equivalent to the falling edge
    of PHI2.) So I don't use the other clock edge.
    I hope that this answers your question. :)
           Message was sent through the cbm-hackers mailing list

    Archive generated by hypermail 2.1.4.