First, I'm mostly an analog engineer just now getting into microcontroller design. I'll be using the XC167 and am have trouble finding external memory. I have 12MB of external memory area and am therefore looking for 12MB of memory. Ive been looking for synchronous DRAM but can only find 64MB and greater. Does anybody have recommendations for external memory?
I refer to my earlier post about managing software engineers... The original question was about memory ICs for a 16 bit controller? I recently used a 128kx32 SRAM from IDT(can be used as x16), you might check their catalog. I too have a hat that says hardware on it and I follow the general rule of laying out the PCB to provide all the memory the CPU can use and then populating during assembly as desired. That is unless the application specifically calls for less than the maximum( say rev3 going to production..) Good luck.
Thanks William, I'll check it out..........That's all I was looking for.........And yes, I have been asked to provide a design for the maximum amount of memory in the case that we need it. Right now software is only using 2M. Mike
well, it seems that your request for SRAM manufacturers got lost in the fray, ISSI has up to 512k*16 see http://www.issi.com/index.html >product search >sram >asynch. You will need an awful lot of chips to populate 12M with 512k chips, but that may be what you have to do. Do remember that the code in this type of application "typically" reside in flash, there you can get much more on a chip for less money (I use SST, they have a 1000 times faster erase than most). Ask those programmers, that evidently do not tell you much, how they want the memory to be divided RAM/Flash Erik
Thanks........that 512kb x 16 is fast too.........this helps
Eric, The memory you refered me to is 3.3V and this processor is 5.0V.........Did you use this memory with the xc167?
The memory you refered me to is 3.3V and this processor is 5.0V.........Did you use this memory with the xc167? Nope, with a 3V3 processor - my oversight, sorry. Erik
Is there anyway to still use 3.3V mem on a 5v uP? The data bus should be fine, I just have to worry about the other inputs........Is there anything wrong with using a resister array to lower the voltage? Would it be better to use a 3V3 buffer with 5v Input? There's not much of a selection of memory at 5v.
3V3 and 5V mixing is an issue with many answers. I would be very hesitant to use anything but something like 74LVC4245 for a memory bus. Erik
Yeah, thats exactly what I was thinking of..........