Altera 50G Interlaken MegaCore Function Instrukcja Użytkownika Pobierz pdf (Strona 32)

Figure 4-2: 50G Interlaken IP Core Transceiver Initialization Sequence

The internal initialization sequence implemented by the reset controller included in the 50G Interlaken IP

core. In Arria 10 devices, the pll_locked signal originates in the external PLL. In other devices, it

originates in the 50G Interlaken IP core itself.

reset_n

pll_pdn

pll_locked

tx_digital_rst

rx_analog_rst

rx_is_lockedtodata

rx_digital_rst

tx_usr_srst

rx_usr_srst

Following completion of the reset sequence internally, the 50G Interlaken IP core begins link initializa‐

tion. If your 50G Interlaken IP core and its Interlaken link partner initialize the link successfully, you can

observe the assertion of the lane and link status signals according to the Interlaken specification. For

example, you can monitor the tx_lanes_aligned, sync_locked, word_locked, and rx_lanes_aligned

output status signals.

By default, in Arria V GZ and Stratix V devices, after you assert the reset_n signal, you must wait 2

mm_clk cycles before you attempt to access the 50G Interlaken IP core registers using the IP core

management interface. You can modify the size of the reset counter with an RTL parameter. Altera

recommends that you set the value of the RTL parameter CNTR_BITS to six for simulation. If you set

CNTR_BITS to the value of six, you must wait 2

mm_clk cycles before you attempt to access the

50G Interlaken IP core registers using the IP core management interface.

In Arria 10 devices, the required wait time from asserting the reset_n signal to safely accessing the IP

core registers is a function of the internal reset controller.

Related Information

• IP Core Reset Sequence with the Reconfiguration Controller on page 4-7

You must wait until the required Altera Transceiver Reconfiguration Controller completes configura‐

tion of the transceivers before you assert the reset_n signal.

4-6

IP Core Reset

UG-01140

2015.05.04

Altera Corporation

Functional Description

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Altera 50G Interlaken MegaCore Function Instrukcja Użytkownika Strona 32