Overview
The 2K8RAM is a memory component that lets you write and read 8 bit data; it has 4096 memory addresses where you to store your data. This component is a core model as part of the XSPICE simulation engine and this example shows how to write and read data to this component.
Description
The pin out for this component is as follow:
D0 -D7 - Digital inputs
A0 - A11 - Addresses
WE - Write when high and read when low
CS - Address select
Q0-Q7 - Digital outputs
In this example, two bits data will be written to D0 and D1 and address A0 and A1 are used, the remaining digital inputs and address pins are set to low constant. The data in the table below was entered into the Word Generator. Since this part does not have a clock, between each state you should add set all inputs to 0.
| CS | WE | A0
| A1 | D1 | D0
| Description
|
|---|
| 1 | 1 | 0 | 0 | 0 | 1 | Write 01 to address 00 |
| 0 | 0 | 0 | 0 | 0 | 0 | Next clock cycle |
| 1 | 1 | 1 | 0 | 1 | 0 | Write 10 to address 01 |
| 0 | 0 | 0 | 0 | 0 | 0 | Next clock cycle |
| 1 | 1 | 1 | 1 | 1 | 1 | Write 11 to address 11 |
| 1 | 0 | 0 | 0 | 0 | 0 | Next clock cycle |
| 1 | 0 | 0 | 0 | 0 | 0 | Read data from address00 |
| 0 | 0 | 0 | 0 | 0 | 0 | Next clock cycle |
| 1 | 0 | 1 | 0 | 0 | 0 | Read data from address 01 |
| 0 | 0 | 0 | 0 | 0 | 0 | Next clock cycle |
| 1 | 0 | 1 | 1 | 0 | 0 | Read data from address 11 |
Steps to Implement or Execute Code
To run the attached example circuit do the following:
- Double-click the Word Generator to expand the interface
- Right-click on the first row of binary data and select Set Cursor in the context menu
- Click the Step
- Select Simulate»Run or click the Run icon
- Click the Step button to step through the data, wait for the probes connecting to WE and CS pin to change state before you click Step again
Requirements
Software
NI Multisim 13
Hardware
Additional Images or Video
Tien P.
National Instruments
