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Figure 52.
PMA Direct 10G x 1
E-Tile Native PHY IP
TX PMA
10.3125Gbps
RX PMA
E-Tile FIFO
E-Tile FIFO
EMIB
Native PHY IP
Core Interface
tx_clkout
257.8125 MHz
TX Data
tx_coreclkin
rx_coreclkin
rx_clkout
257.8125 MHz
RX Data
XCVR
Interface
XCVR
Interface
/2
/2
TX Core
FIFO
RX Core
FIFO
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)
4.2.3. Four 25 Gbps PMA Direct Channel (with FEC) within a Single FEC
Block
Table 42.
Four 25 Gbps PMA Direct Channel (with FEC) within a Single FEC Block
Configuration
Data Rate per
Channel
Number of Channels
TX and RX Double
Width
PMA Interface
Core Interface
25.78125 Gbps
4
Enabled
32 bits
64 bits
Connect half rate
tx_clkout
(402.83MHz) to the
tx_coreclkin
and
rx_coreclkin
. If you use any other source for
tx_coreclkin
, make sure
tx_coreclkin
has 0 PPM difference with
tx_clkout
.
4.2.3.1. Master-Slave Configuration: Option 1
All four channels use a common FEC block, but FEC only uses one clock from the four
available channels. You can select the source channel of the FEC clock in the FEC tab
of Native PHY IP Parameter Editor through the RS-FEC Clocking Mode option. The
selected source channel is considered the master. The other three channels use that
same clock for clocking their TX and RX data paths, and are considered slave
channels. An interruption on the master channel PMA, a PMA reset, for example,
impacts the slave channels. This creates a dependency between the master and the
slave channels.
4. Clock Network
UG-20056 | 2019.02.04
Intel
®
Stratix
®
10 E-Tile Transceiver PHY User Guide
91