User guide

Figure 4-3: Transmitter Reset Sequence After Power-Up
Device Power Up
pll_cal_busy
tx_cal_busy
pll_powerdown
tx_analogreset
pll_locked
tx_digitalreset
1
1
2
3
Device in User Mode
t
pll_lock
max 10 μs
min 20 ns
t
tx_digitalreset
Resetting the Transmitter During Device Operation
Follow this reset sequence to reset the PLL or the analog or digital blocks of the transmitter at any point
during the device operation. Use this reset to reestablish a link or after dynamic reconfiguration. The
following steps detail the transmitter reset sequence during device operation. The step numbers
correspond to the numbers in the following waveform.
1. Perform the following steps:
a. Assert pll_powerdown, tx_analogreset, and tx_digitalreset while pll_cal_busy and
tx_cal_busy are low.
b. Deassert pll_powerdown after a minimum duration of t
pll_powerdown
.
c. Deassert tx_analogreset. This step can be done at the same time or after you deassert
pll_powerdown.
2. The pll_locked status signal goes high after the TX PLL acquires lock.
3. Deassert tx_digitalreset after pll_locked goes high.
Note:
You must reset the PCS blocks by asserting tx_digitalreset, every time you assert
pll_powerdown and tx_analogreset.
4-4
Resetting the Transmitter During Device Operation
UG-01143
2015.05.11
Altera Corporation
Resetting Transceiver Channels
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