Altera Stratix GX Transceiver Manuel d'utilisateur Page 265

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Altera Corporation 9–39
January 2005 Stratix GX Transceiver User Guide
Reset Control & Power Down
/*synchronizing the rxdigitalreset to recovered clock domain
If rxdigitalreset is used for Receive GXB, then this
synchronization is needed because
internally the rxdigitalreset is synchronized to recovered clock
(rx_clkout).To reset the rx_coreclk domain logic in
PLD fabric following reset is useful
*/
always @(posedge rx_coreclk or posedge async_reset)
if(async_reset)
begin
rxdigitalreset_rx_coreclk_Q <= 1'b1;
rxdigitalreset <= 1'b1;
end
else
begin
if(receive_digitalreset)
begin
rxdigitalreset_rx_coreclk_Q <= 1'b1;
rxdigitalreset <= 1'b1;
end
else
begin
rxdigitalreset_rx_coreclk_Q <=
rxdigitalreset_inclk;
rxdigitalreset <=
rxdigitalreset_rx_coreclk_Q;
end
end
endmodule
Design Example 2
This design example shows a receive-only configuration where inclk is
the transmit PLL input reference clock, the output of transmit PLL trains
receive CRU, and rx_clkout is the receive parallel interface clock.
This design example has the following constraints:
If your design requirements are different from the examples, use the
flow charts and waveforms for each configuration as design
guidelines.
The design example requires a reset controller that generates a
sync_reset (synchronous reset) for the entire system.
The design example has an async_reset (a power down in GXB
terms) and digital resets for transmit and receive. All user input
digital resets must be at least four cycles long.
This design example does not cover all the digital reset scenarios in
a system that resets the digital logic of the GXB.
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