Altera UG-01080 Guía de usuario Pagina 59

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Chapter 4: Backplane Ethernet 10GBASE-KR PHY IP Core 4–11
Clock and Reset Interfaces
November 2012 Altera CorporationAltera Transceiver PHY IP Core
User Guide
1 The block diagram shown in the GUI labels the external pins with the interface type
and places the interface name inside the box. The interface type and name are used in
the _hw.tcl file. If you turn on Show signals, the block diagram displays all top-level
signal names.
f For more information about _hw.tcl files, refer to refer to the Component Interface Tcl
Reference chapter in volume 1 of the Quartus II Handbook.
Clock and Reset Interfaces
Use the Transceiver PHY Reset Controller IP Core to automatically control the
transceiver reset sequence. This reset controller also has manual overrides for the TX
and RX analog and digital circuits to allow you to reset individual channels upon
reconfiguration.
If you instantiate multiple channels within a transceiver bank they share TX PLLs. If a
reset is applied to this PLL, it will affect all channels. Altera recommends leaving the
TX PLL free-running after the start-up reset sequence is completed. After a channel is
reconfigured you can simply reset the digital portions of that specific channel instead
of going through the entire reset sequence. For more information about reset, refer to
the Transceiver Reconfiguration Controller IP Core.
Figure 4–4 provides an overview of the clocking for this core when you disable1588.
Figure 4–4. Clocks for Standard and 10G PCS and TX PLLs (1588 Disabled)
xgmii_rx_clk
156.25 MHz
xgmii_tx_clk
156.25 MHz
Native PHY
Stratix V STD
RX PCS
Stratix V
TX PMA
tx_coreclkin_1g
125 MHz
Stratix V
RX PMA
TX PLL
TX PLL
40
rx_pld_clk rx_pma_clk
TX serial data
8
GMII TX Data
72
XGMII TX Data & Cntl
RX data
40
TX data
40
TX data
serial data
pll_ref_clk_10g
644.53125 MHz
or
322.265625 MHz
pll_ref_clk_1g
125 MHz
or
62.5 MHz
Stratix V STD
TX PCS
tx_pld_clk tx_pma_clk
8
GMII RX Data
pll_ref_clk_10g
72
XGMII RX Data & Cntl
recovered clk
257.8125 MHz
rx_coreclkin_1g
125 MHz
Stratix V 10G
RX PCS
rx_pld_clk rx_pma_clk
Stratix V 10G
TX PCS
tx_pld_clk tx_pma_clk
fractional
PLL
(instantiate
separately)
GIGE
PCS
GIGE
PCS
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