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