How use sram?

baghiero83:

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I must use the sram on fpga Cyclone ii with quartus ii.

How can i use it?

I have used the megafunction but i don't see in the istantion the chip enable, read enable and other signals.

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I suppose you are trying to use the Cyclone II on-chip memory.

The MegaWizard is an efficient tool to generate a specific RAM for you. The RAM block at least has both an input port AND an output port. You only need a signal wren for writing. Reading is always done on every clock cycle.

The signals you are refering to are signals that occur when you are sharing the input- and output lines of your RAM. By making a wrapper arround the MegaWizard RAM block you can constrain yourself to only using one port for both reading and writing that you can then interface via an external tri-state bus. Internally on the FPGA I do not see the usage of this.

Thanks, so i can't use the chip enable because the ram is always enabled?

Are you sure that when i use megawizard ram , i use sram and not sdram on-chip?

How can i constraint myself to using one port?

Thank you very very much!

baghiero83:

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Thanks, so i can't use the chip enable because the ram is always enabled?

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The Ram is always enabled. If you want a chip enable, you have to add it yourself.

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Are you sure that when i use megawizard ram , i use sram and not sdram on-chip?

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On a normal CMOS chip you normally only have SRAM blocks. The Block RAMs on FPGAs are SRAM. DRAM requires a special technology that is not compatible with normal CMOS technology. So there are no DRAMs on FPGAs up to now. DRAMs are separate chips.

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How can i constraint myself to using one port?

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I do not understand why you would like to do this on-chip of the FPGA?

1) Do you want to access the FPGA on-chip memory from outside?

2) Do you want to access of-chip memory from your FPGA