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Hercules™ Safety Microcontrollers Forum
16 bit data addressing
I am using the TMS470R1B1M chip currently( I know it will be discontinued soon). I have a question regarding adressing 16 bit data(word data) in external memory. I was told that this chip has a bug in that it cannot address 'even word' addresses in external memory if the data size is 16 bits. Therefore when I am using the external memory chip "IS61WV25616ALL/ALS " which is of size 256K words of memory space, I was told that I can use only 128K words of space - where only the odd address words are being written into. The address lines are 18 in number (256K words)and the resultant memory has dropped down to half(128K words).
Can you please confirm/correct the above statement. If the statement is indeed true please give me all the details as to what memory locations are actually being used, it is the 0th word, 2nd, 4th, 8th word and so on OR 1st word, 3rd word 5th word and so on???
Also how does pointer arithmetic perform if this is the case. When I increment a word pointer pointing to this memory, does it increment in 2 bytes or 4 bytes??
Please provide as much detail as possible because the keil debugger I have is showing me some misleading stuff - maybe because of the issue.
I was told that if the data size used is 8 bits then there is no issue.
We are taking a look into your questions.
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