Timing Closure Recommendations - Intel Arria 10 User Manual

3. PLLs and Clock Networks
UG-01143 | 2018.06.15
Connection Guidelines for PLL and Clock Networks
• For 12.5 Gbps Interlaken with a bonded group of 10 channels, connect the
tx_bonding_clocks
Make this connection for all 10 bonded channels. This connection uses a master
CGB and the x6 / xN clock line to reach all the channels in the bonded group.
•
Connect the
PHY IP to the
connection uses the x1 clock line within the transceiver bank.
•
Connect the
10GBASE-KR PHY IP to the
5.1625 GHz). This connection uses the x1 clock line within the transceiver bank.
•
Connect the three
follows:
— Connect
(fPLL at 5.1625 GHz). This PLL instance is shared with the two 10GBASE-KR
PHY IP channels and also uses the x1 clock line within the transceiver bank.
• Connect the 1.25 Gbps Gigabit Ethernet non-bonded PHY IP instance to the
tx_serial_clk
each channel. This connection uses the x1 clock line within the transceiver bank.
• Connect the PCIe Gen3 bonded group of 8 channels as follows:
— Connect the
port of the Transceiver PLL Instance 6. Make this connection for each of the 8
bonded channels.
— Connect the
transceiver PLL instance 6.
— Connect the
pipe_hclk_in
— Connect
port of the PLL instance 6. This connection is required as a part of the PCIe
speed negotiation protocol.

3.11.5. Timing Closure Recommendations

Register mode is harder to close timing in Arria 10 devices. Intel recommends using
negative edge capture on the RX side for periphery to core transfers greater than 240
MHz. To be specific, capture on a negative edge clock in the core and then
immediately transfer to a positive edge clock.
• Use PCLK clock network for frequencies up to 250 MHz.
• Local routing is recommended for higher frequencies.
For core to periphery transfers on TX targeting higher frequencies (beyond 250 MHz),
Intel recommends using TX Fast Register mode as the PCS FIFO mode. This is the
mode with PCLK that should be used by default for most 10GbE 1588 modes and 9.8
Gbps/10.1376 Gbps CPRI mode.
• You can use local routing to get up to 320 MHz in Register mode for the highest
speed grade.
to the transceiver PLL's
port of the first two instances of the 10GBASE-KR
tx_serial_clk
port of PLL instance 1 (fPLL at 5.1625 GHz). This
tx_serial_clk
port of the remaining two instances of the
tx_serial_clk
tx_serial_clk
tx_serial_clk
port to the
tx_serial_clk0
port of the PLL instance 5. Make this connection twice, one for
tx_bonding_clocks
of the PHY IP to the
pipe_sw_done
port of the PLL instance 5 to the PHY IP's
pll_pcie_clk
port.
port of the PLL instance 5 to the
tx_serial_clk
tx_bonding_clocks
port of the PLL instance 2 (fPLL at
ports for the custom multi-data rate PHY IP as
tx_serial_clk
of the PHY IP to the
pipe_sw
® ®
Intel Arria 10 Transceiver PHY User Guide
output port.
port of PLL instance 2
tx_bonding_clocks
port of the
mcgb_aux_clk0
413