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Simulate Data Bus Width of 16-bit for External Memory

Is it possible to simulate external memory with a DBW of 16-bit? My external memory is setup so that 2 chips with 8-bit memory are sharing the same memory location. I would like to be able to simulate this with the uVision debugger. I enabled the memory region for the debugger with the statement

MAP  0x10000000,0x1000FFFF  READ WRITE  // allow R/W access to external

However, a float still takes up 4 address locations rather than the desired 2.

Any ideas?

Parents

0 Richard Nigro over 19 years ago in reply to Keil Software Support Intl.

Sorry, I'm simulating an ADuC7026. I configure it in the following manner.

 GP2CON = 0x02222000; // WS, RS, AE, MS0
 GP3CON = 0x22222222; // AD0 - AD7
 GP4CON = 0x22222222; // AD8 - AD15

 XMCFG = 1;       // Enable external memory access
 XM0CON = 3;      // 16-bit DBW, Enable memory region 0
 XM0PAR = 0xA722; // Enable byte write strobe

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0 Richard Nigro over 19 years ago in reply to Keil Software Support Intl.

Sorry, I'm simulating an ADuC7026. I configure it in the following manner.

 GP2CON = 0x02222000; // WS, RS, AE, MS0
 GP3CON = 0x22222222; // AD0 - AD7
 GP4CON = 0x22222222; // AD8 - AD15

 XMCFG = 1;       // Enable external memory access
 XM0CON = 3;      // 16-bit DBW, Enable memory region 0
 XM0PAR = 0xA722; // Enable byte write strobe

Children

0 Richard Nigro over 19 years ago in reply to Richard Nigro

Ok, forgetting data bus width, I don't think data bus width is my problem. I have 32k worth of addresses (0x000 - 0x7FFF) and each addresses can hold 2 bytes (16 bits) worth of data. That's 64kBytes worth of data from 0x1000000 to 0x10007FFF. How can I get the simulator to reflect that?
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