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Altera_Forum's avatar
Altera_Forum
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14 years ago

Stratix-II GXB Reconfiguration simulation trouble

Hello.

I am trying to simulate GXB transceiver reconfiguration for Stratix-II IC in Modelsim-Altera.

My Quartus version is 9.1sp1.

I am creating transceiver block that can be reconfigured in 2 states:

1) STM-16(OC-48)

2) Basiс mode

I am creating this transceiver according to Stratix-IIGX handbook, volume II section I.

When I simulate the GXB transceiver with reconfiguration possibility, I can see the following waveforms (see picture).

After the reset sequence, when tx_digitalreset = 0 (inactive), transmitted signal became consisting z-states (pink lines in GX_TX signal).

If I reconfigure the transceiver (uploading .mif file into it), the behavior is the same: after the reset sequence, when tx_digitalreset = 0 (inactive), transmitted signal became consisting z-states (pink lines in GX_TX signal).

When tx_digitalreset = 1 (active), there is no z-states in the output signal.

Did anybody try to simulate reconfiguration in Stratix-IIG?

What can lead to z-states in the output of the transmitter?

What is the problem and how it could be solved.

Thank you in advance.

2 Replies

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

    Nobody tryed to reconfigure Stratix-II transceivers?

    Or transceivers of any other Stratix/Cyclone/Arria?
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    14 years ago

    The problem is solved.

    My TX_Data[15:8] were not connected to the proper tx_datainfull input of the GXB, so Modelsim used "z-state" as a values of thу MSB of the transmitted data and it transmitted z-state to the output high-speed line.