I have problem with ArriaGX alt2gxb megafunction. The megafunction is
configured as PIPE, non-bonding mode. A port consists of 2 channels
(tx0, rx0 and tx1, rx1), each has 16-bit/125MHz interface to the PLD
side. A reference clock is supplied from an external pin to tx0, and
its tx_clkout is distributed to both tx_coreclk(1 downto 0) and
rx_coreclk(1 downto 0).
The problem is that the pipeelecidle port outputs '1' forever for both
channels, and rx_syncstatus never goes to high. I guess this means
that the transmitter is in idle state for some unknown reason.
When the device is powered on, both pll_locked and rx_pll_locked are
asserted, and the core clock seems to be running. As for CRU locking,
first I tried auto locking mode. But in that mode the resceiver cannot
switch from locktorefclk to locktodata state. So I am now using manual
locking mode.
The following sequence goes on as power-up sequence:
1. gxb_powerdown is asserted for 1ms, and then deasserted.
tx_digitalreset, rx_analogreset and rx_digitalreset
are also asserted.
2. tx_digitalreset and rx_analogreset are deasserted 1 clk after
pll_locked is asserted.
3. rx_digitalreset is deasserted 1 clk after rx_pll_locked is asserted.
4. send K28.5 until rx_syncstatus is asserted (but actually it never get
asserted, and pipeelecidle never get deasserted).
Am I forgetting something critical, may be?
