how to increase the RAM address?

[digitalman]

Hi,

I am trying to simulate a logic circuit which has a pair of 128k x 8-bit ram chip. The problem is that the LogicCircuit program supports only up to 15 addr bit just short of 1-bit for my need. Instead of modifying the source code, is there simpler way of combine two ram chip to accomplish the task?

After some searching in the source code. I found and changed the variable 'MaxAddressBitWidth' from 16 to 17 in "Memory.cs," I'll try to recompile the code and see that will do it. Thanks!

V/r,
Long

[admin]

It is actually supports 16 bits address which is 1 bit shorter for 128k indeed.
You can build bigger memory from 2 chunks of 64K.

[digitalman]

I recompile the code after changing the max from 16 to 17, and it seems to work properly. I'll try to combine 2-64k x 8 bit ram to emulate 128k x 8 bit ram.

[digitalman]

it looks like implementing larger ram with smaller ram modules would take some work. it's doable, but the stock ram module needs to be added with chip enable control along with a decoder to select the ram modules. Also, in order to tie the ram modules output together, tri-state buffers will need to be added for each output bits. I'll settle with changing the source code from maximum addressable bit of 16 to 17 for now.