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 Device Offset problem - logical v physical address		  Forum Locked
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marsh

4 Posts
Posted - 12/26/2009 :  19:54:35  Show Profile
system: True USB Pro GQ-4X with GQ USB programmer v5 software

Hello,

I have written some code for a motorola 6808 processor which must reside in a 2716 (2k) eeprom starting at logical address 7800 (hex).

To do this I have used the org 7800 pseudo-op. When I load the assembled S file into memory of the GQ USB programmer v5 software and look at address 7800, I see my code. However, if I first select a 2716 eeprom as the device and then load the code, I see only the first 2k of registers (0-07FF).

My problem is that I need to load the code at logical memory address 7800-78FF into physical address 0000-00FF of the eeprom. I assume that device offset should be used for doing this but when I enter 7800 into the devce offset... nothing seems to change.

Please help me understand how I can load a program with one logical address range into an eeprom with a smaller physical address range.

Thanks!
Tim
Reply #1

marsh

4 Posts
Posted - 12/28/2009 :  09:29:22  Show Profile
okay... so I guess I can cut and paste the code from the logical address to the correct physical address but then what is "Device Offset" for? Anyone know? Thanks!
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Reply #2

ZLM

2945 Posts
Posted - 12/28/2009 :  14:21:25  Show Profile
The Device Offset is used when writting the code into a device. The first data in buffer will start to write from the Device Offset address specified.
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Reply #3

marsh

4 Posts
Posted - 01/01/2010 :  10:14:29  Show Profile
Okay... I get it now. It would be great to have an option where you can select the starting address in the buffer to start dumping to the device. This way I could dump logical address 7800 (in the buffer) to physical address 0000 in the eeprom without having to cut and paste everything. Just a suggestion that would be welcomed.
Thanks.
Tim
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