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ramachandiran.v@s... 15-01-2005 11:45:01 >>>

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Hi
Have you also seen that you only read data once from the fifo?
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Søren Ingemann Petersen

DELTA Danish Electronics, Light & Acoustics   Tel:      72 19 40 00
DELTA Microelectronics                                    Direct: 72 19 42 38
Venlighedsvej 4                                                 Fax:     72 19 40 01
DK-2970 Hørsholm

>>> ramachandiran.v@s... 15-01-2005 11:45:01 >>>
Dear USB People,

I have a Question regarding USB 1.1 Endpoint .

First Let me describe what I'm doing using USB Core.

I developed PS2 Keyboard to USB application using USB 1.1 core. I wrote PS2 
Interface logic and gluelogic to store ASCII value of the Pressed Key in Endpoint 5.
[ Endpoint 5 is configured as IN , INTERRUPT with max of 64 Byte transfer. I use 
Windriver USB software to read USB Port.

ep5_cfg = `INT |  `IN | 14'd0001 

Device Enumeration is taking place properly and i could see all the endpoints with the
same setup mentioned in usb1_rom.v file.

The Problem i'm facing is like , what ever the data i type in Keyboard , It is read and 
displayed TWICE. I checked the behavioral simulation and saw that the data is stored 
in Endpoint FIFO only once with WE for FIFO is kept asserted for 1 Clock Pulse.

I even tried to store the data into Endpoint FIFO continuously and then Invoked 
Windriver software. Then also each character is displayed TWICE [ i.e., . i Typed 
rama ..But i received as ..rraammaa ].

Is this the Problem with INTERRUPT Transfer Mechanism the way i configred.
or
Could it be the Problem of Windriver Software ?..

Can anyone clarify me where exactly the Problem and how can i overcome this ?

It would be grate Helpful for me.

Thanks in Advance ,
Ramachandiran.V

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