lpm_ram_dq Megafunction

Parameterized RAM with separate input and output ports megafunction. Altera recommends usinglpm_ram_dq toimplement asynchronous memory or memory with synchronous inputs and/or outputs. This megafunction is provided only for backward compatibility; instead, Altera recommends using the altsyncram megafunction. The lpm_ram_dq function uses DFFE primitives or latch arrays in MAX3000 and MAX7000 devices, or if the USE_EAB parameter is set to "OFF". Altera strongly recommends using synchronous rather than asynchronous RAM functions.

Note:
  • The Compiler automatically implements this function in logic cells in MAX3000 and MAX7000 devices.
  • You can use the lpm_ram_dq megafunction to read data from and write data to in-system memory in devices with the In-System Memory Content Editor . To use the lpm_ram_dq megafunction with the In-System Memory Content Editor, you must turn on the Allow In-System Memory Content Editor to capture and update content independently of the system clock option (that is, the ENABLE_RUNTIME_MOD and INSTANCE_NAME parameters must be enabled) when instantiating the lpm_ram_dq megafunction with the IP Catalog.
  • You can use the Assignment Editor to add, change, or delete assignments and assignment values for megafunctions.
Note: More information is available on the lpm_ram_dq megafunction on the Altera website.
Related reference

altsyncram Megafunction
DFFE Primitive
Related information

In-System Memory Content Editor
Assignment Editor

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