Reading Data from DRAM - 128 Bit Memory Interface
- Updated2025-01-23
- 2 minute(s) read
Reading Data from DRAM - 128 Bit Memory Interface
Complete the following steps to read data from DRAM.
LabVIEW contains example VIs that read and write to the Random Access - 128 Bit memory interface. To access the NI Example Finder, open LabVIEW and select , then select . You can also access device-specific examples by selecting Add device from the Hardware pull-down menu in the NI Example Finder.
Note The Random Access - 128 Bit memory
interface queues read requests internally. Therefore, you may issue multiple read
requests for different addresses before you even receive the data back for your
first read request. As a result, if you are queuing up multiple read requests, it is
important that you properly track the order of the data that is returned when
Read_Strobe asserts. All data returned from the Random
Access - 128 Bit memory interface when Read_Strobe asserts is
properly ordered with respect to the original read request command ordering.
- Ensure that the Command_FIFO_Full Boolean is FALSE.
- Drive the Address signal with the DRAM memory address that you want to read from.
- Drive the Command signal with 1. This signal communicates to the Random Access - 128 Bit memory interface to perform a memory read command.
- Drive the Command_Write_Enable signal to TRUE for one clock cycle. You must only drive this signal for a single clock cycle if you want to only issue a single memory read command. Each clock cycle in which this signal is asserted causes a new read command to be issued to the Random Access - 128 Bit memory interface.
- Continually monitor the state of the Read_Strobe signal. When this signal reads as TRUE, latch the 128-bit data value on the Read_Data_Upper and Read_Data_Lower signals. This contains the data most recently read from the Random Access - 128 Bit memory interface.