Interfacing (RAM) Onboard M4K memory blocks of Cyclone II Altera De1 board

This code shows how to store or interface the SRAM with any of your code. You can integrate this code in your projects for storing data. I will upload the interface of RAM with RTC code I designed for storing Date.

In this code I used the on-board M4K memory blocks on Altera DE1 board as RAM in 32 words i.e. 32 address locations of 4-bit. The RAM is initialized through Altera's MegaFunction IP Library. Comment if you don't know how to initialize RAM on any Altera board. I stored some variables like 2,4,6,8 on some starting locations to check if its working. I also added feature of manual address incrementation and data i/p.

For manual data entry you have to use four switches on Altera De1 board viz.

• SW0 --LSB
• SW1
• SW2
• SW3 --MSB

To write data press KEY3 and to increment address location press KEY0.

Read operation will be done Automatically, as I have interfaced the BCD to 7SEG (modified seg7.vhd in my previous posts) decoder directly to data out of RAM. You will get to see the stored digit on 7Seg display no.1.

You can directly interface the write enable, I/P and O/P of data and address in your code with only some minor changes.

If you have any qurries feel free to Comment directly on post instead of mailing me so other people will also get some help from it. You still can mail me your querries and Ideas at prasadp4009@gmail.com.

Download liks:

• Main Entity sram_test.vhd     : sram_test.vhd
• Altera DE1 Quartus .sof file  : sram.sof
• Megafunction file                  : srm.vhd
• Seg7 modified                      : seg7.vhd

Video:

RTC on FPGA with manual set synthesizeble VHDL code.

Hey there, cheers to VHDL. I successfully added manual set feature in my previous RTC project. I am not going to copy whole code here. I am just adding the links of .vhd files. I also added the pre-compiled .sof file only for DE1 boards. There is a very small bug that while clicking the set button to enable min and hr set, it increments the hr or min value unintentionally. Else everything is working great.

(Input freq 24MHz., top-level entity DigiClock)

Video will be uploaded soon.

On DE1 board: Push button functions.

• Key0: Reset
• Key1: Hour set (Key3 kept pressed)
• Key2: Minute set (Key3 kept pressed)
• Key3: Set enable.

Download links:

• DigiClock.sof   --DE1 board .sof file
• DigiClock.vhd
• manu_clk.vhd
• sec_clk.vhd
• min_clk.vhd
• seg7.vhd
• DigicClock.pof --DE1 board only (ActiveSerial Prog. file with EPCS4 device selected)

Video : 

Do test the codes. If you have any querries do comment or mail me at prasadp4009@gmail.com.

Enjoy Programming..!!