[En-Nut-Discussion] IDE interface

[Jesper Hansen]

Looking at the Intersil documentation for the HFA3842 (used in D-Link 
DCF-660 and Netgear MA701),  they state a max WAIT of 12.000 nS !!
In my port I/O based version, I've been using 6 nops (at 7.37 MHz), which 
seems to be enough. A bit difficult to say for sure though, but I've transferred 
a number of files forth and back without problems.

I tried using the XDIV, but that upset the UART so it got completely confused
and sent (and received) erroneous data. It would also upset any other timing 
of course.

I find the port I/O solution quite okay. It uses about 18-20 cycles (2.6uS), which 
is not too bad. But interrupts needs to be disabled as I'm disabling the external
memory interface during the card access.

My April's fool is working pretty well, although not exactly as shown ;-) 
Just wait until you see this years version !!

/Jesper

----- Original Message ----- 
From: "Michael Fischer" <fischermi at t-online.de>
To: <en-nut-discussion at egnite.de>
Sent: Thursday, February 12, 2004 10:12 PM
Subject: [En-Nut-Discussion] IDE interface


> Richard,
> 
> WLAN: This is the problem. The WLAN card use the WAIT signal, for both, IORD
> and IOWR.
> In the moment I work with a "bus emulation". Some latch to emulate the bus
> access, but this takes
> about 1.5us .. 2us.
> 
> I have measured the WAIT, on my notebook, and found waits up to 300ns. A
> full access CE was up to 600ns.
> The atmega is to fast. Without the emulation, it is possible to use the XDIV
> functionality of the CPU,
> and divide the clock to a lower access. I think this is not a good solution.
> 
> Take a look in the Ethernut CF (WLAN) Interface thread.
> 
> WRITE function:
> In the moment on hold, I am waiting on a PCB, Harald?
> You will find the source by Ethernut.
> 
> Jesper:
> 
> How is your "April Fool" working?
> 
> Michael
> 
> 
> 
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