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Altera_Forum's avatar
Altera_Forum
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15 years ago

SOPC builder and DPRAM

High!

I need to implement a dpram with AVALON on 1 side and a free access for an IP I already have.

The avalon would be in a write only scheme and the IP in read only.

But when I put an on chip ram in dp it apparently puts a2nd avalon and not just the other port for free access. Actually I mean simple exported conduits on the port I wish to have non- avalon.

Any trick or should I put a dummy design that puts the avalon from one side to the other and use a wizzard generated dpram outside the sopc builder?

Thanks in advance for your suggestions.

K.r.

Thomas

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    If you don't need great performance, a simple solution could be this.

    Create dpram outside sopc system, with the wizard; then add a tristate bus in sopc builder and connect here one port of the ram.
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    You can also design a custom component with the dual port ram inside, one port connected to an Avalon Slave interface and the other one an export interface that directly exposes the signals.

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    Hi Cris72 and Daixiwen!

    Thanks for your fast reply.

    Actually I've started implementing Daixiwen's solution.

    This because I've decided to put the whole IP as a custom peripheral. So the DPRAM is only a section of that.

    By the ways it's an I2S interface with a 2K samples buffer.

    Samples are streamed in and out by Ethernet.

    The IP has been used before on an Excalibur EPXA4!

    That was a good one!

    Good day to all of you

    Thomas