Implementing CAM, RAM & ROM
The Quartus® II software and AHDL support several library of parameterized modules (LPM) functions and other megafunctions that allow you to implement content-addressable memory (CAM), RAM, and ROM in Altera® devices. The generic, scalable nature of each of these functions ensures that you can use them to implement any supported type of CAM, RAM, or ROM.
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Altera recommends that you either use Altera-provided megafunctions to implement CAM, RAM, or ROM, or use the MegaWizard® Plug-In Manager (Tools menu) to edit Altera-provided CAM, RAM, or ROM megafunctions. You should not create a megafunction to implement memory or edit the text file for an Altera-provided megafunction. |
You can use the following megafunctions to implement CAM, RAM, and ROM in the Quartus II software:
| Name: |
Description: |
lpm_ram_dq |
Synchronous or asynchronous memory with separate input and output ports |
lpm_ram_io |
Synchronous or asynchronous memory with a single I/O port |
lpm_rom |
Synchronous or asynchronous read-only memory |
altsyncram |
True dual-port memory |
lpm_ram_dp
|
Dual-port memory
|
altdpram |
Dual-port memory |
altqpram |
Quad-port memory |
lpm_fifo_dc |
Dual-clock first-in first-out (FIFO) buffer |
lpm_fifo+ |
Single-clock (FIFO) buffer |
altcam
|
Content-addressable memory (CAM)
|
In these logic functions, parameters are used to determine the input and output data widths; the number of data words stored in memory; whether data inputs, address inputs, control inputs, and outputs are registered or unregistered; whether an initial memory content file should be included for a RAM block; and so on. You must declare parameter names and values for an instance of a CAM, RAM, or ROM logic function using a WITH clause, as described in Using Altera-Provided Parameterized Functions.
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