Figure 53.
PMA Direct 25 Gbps x 4 (FEC On)
RX FEC is also clocked by the TX PMA generated clock.
E-Tile Native PHY IP
TX PMA
RX PMA
FEC
FEC
E-Tile FIFO
E-Tile FIFO
EMIB
rx_coreclkin
rx_clkout
402.83 MHz
XCVR
Interface
XCVR
Interface
/2
/2
CH3
Slave
tx_clkout
402.83MHz
tx_coreclkin
E-Tile Native PHY IP
TX PMA
RX PMA
FEC
FEC
E-Tile FIFO
E-Tile FIFO
EMIB
rx_coreclkin
rx_clkout
402.83 MHz
XCVR
Interface
XCVR
Interface
/2
/2
CH2
Slave
tx_clkout
402.83 MHz
tx_coreclkin
25.78125 Gbps
25.78125 Gbps
E-Tile Native PHY IP
TX PMA
RX PMA
FEC
E-Tile FIFO
E-Tile FIFO
EMIB
rx_coreclkin
rx_clkout
402.83 MHz
XCVR
Interface
XCVR
Interface
/2
/2
/2
CH0
Master
tx_clkout
402.83 MHz
tx_coreclkin
25.78125 Gbps
FEC
Legend:
TX PMA generated parallel clock (line rate / PMA interface width)
TX PMA generated parallel clock div by 2
RX PMA generated parallel clock div by 2
RX PMA generated parallel clock (line rate / PMA interface width)
TX Core
FIFO
RX Core
FIFO
TX Core
FIFO
RX Core
FIFO
TX Core
FIFO
RX Core
FIFO
E-Tile Native PHY IP
TX PMA
RX PMA
FEC
E-Tile FIFO
E-Tile FIFO
EMIB
rx_coreclkin
rx_clkout
402.83 MHz
XCVR
Interface
XCVR
Interface
/2
/2
CH1
Slave
tx_clkout
402.83 MHz
tx_coreclkin
25.78125 Gbps
FEC
TX Core
FIFO
RX Core
FIFO
4.2.3.2. Master-Slave Configuration: Option 2
In this configuration, you can select to import the TX and RX datapath clocks and
EMIB clock from an external source in the FPGA core. Enable this by selecting the
tx_coreclkin2
port in the Core Interface tab of Native PHY IP Parameter Editor.
Once
tx_coreclkin2
is enabled, an extra input port is exposed in the core to drive
the individual EMIB clock for each 25 Gbps channel. The FEC clock is still provided by
the Master channel. This method removes the dependency of a PMA reset between the
4. Clock Network
UG-20056 | 2019.02.04
Intel
®
Stratix
®
10 E-Tile Transceiver PHY User Guide
92