3.2.2. Resetting the Transmitter with the User-Coded Reset Controller During Device Power-Up
The numbers in the figure correspond to the following numbered list, which guides you through the transmitter reset sequence during device power-up.
- To reset the transmitter, begin with:
- Assert mgmt_rst_reset at power-up to start the calibration IPs. Hold mgmt_rst_reset active for a minimum of two reset controller clock cycles.
- Assert and hold pll_powerdown, tx_analogreset, and tx_digitalreset at power-up to reset the transmitter. You can deassert tx_analogreset at the same time as pll_powerdown.
- Assert pll_powerdown for a minimum duration of 1 μs (tpll_powerdown). If you use ATX PLL calibration, deassert pll_powerdown before mgmt_rst_reset so that the ATX PLL is not powered down during calibration. Otherwise, pll_powerdown can be deasserted anytime after mgmt_rst_reset is deasserted.
- Make sure there is a stable reference clock to the PLL before deasserting pll_powerdown and mgmt_rst_reset.
- After the transmitter PLL locks, the pll_locked status gets asserted after tpll_lock.
- After the transmitter calibration completes, the tx_cal_busy status is deasserted. Depending on the transmitter calibrations, this could happen before or after the pll_locked is asserted.
- Deassert tx_digitalreset after the gating conditions occur for a minimum duration of ttx_digitalreset. The gating conditions are:
- pll_powerdown is deasserted
- pll_locked is asserted
- tx_cal_busy is deasserted
|To Reset||You Must Reset|
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