[Diy_efi] Re: looking for help with a prom N82S181

Steve Ravet Steve.Ravet at arm.com
Fri Nov 12 04:18:46 GMT 2004

> Pin 18 (/CE - chip enable on the 2716) held to 5v - I=20
> understand that one.
>  And yes it is at 5volts always.  So pull this to ground instead.=20
> Enabling the chip.


> Pin 19 (a10 on the 2716) which I was saying was noise - isn't=20
> is it?   Now
> from what Steve was saying, and please correct me if I am=20
> wrong, is that only half of the signal is usable?  When at=20
> Vcc ok, but when at Gnd I am going to have a problem when=20
> hooked to a 2716 eprom.  So only half of the time this signal=20
> would be usable.  Is that what was being said?  So this=20
> signal is of no use to me with the 2716.  Instead wire it to=20
> Vcc, or Gnd depending on which bank I want all my reading to=20
> be done from.

Looks like a clock to me, but I don't know why a clock would be =
connected to a chip enable.

> Pin 20 (/oe - output enable on the 2716) Pass through=20
> unchanged.  Here I have the correct signal to enable the=20
> output of data to the bus.  This is my true enable signal. =20
> It is good as it stands.  When pulled low, enables the output=20
> phase of the 2716.


> Pin 21 (Vpp - programming power on the 2716)  Shouldn't go to=20
> ground, or
> be toggled on the   2716.  Pull to 5v and that should be all that is
> necessary at this pin.  We're not programming.


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