Altera Stratix GX Transceiver - Manual (Page 283)

Altera Corporation 9–57
January 2005 Stratix GX Transceiver User Guide
Reset Control & Power Down
else if (pll_locked)
begin
state <= IDLE;
txdigitalreset <= 1'b0;
pll_areset <= 1'b0;
end
else
begin
state <= STROBE_TXPLL_LOCKED;
txdigitalreset <= 1'b1;
pll_areset <= 1'b0;
end
default: state = IDLE;
endcase
end
endmodule
Power Down The Quartus II software automatically selects the power-down feature
when you configure the Stratix GX device. All unused transceiver
channels and transceiver blocks in a design are powered down to reduce
the overall power consumption. The power-down feature cannot be used
on the fly to turn the transceiver channels/transceiver blocks on/off
without reconfiguration.
Table 9–2 details the state of the transceiver I/O pins during power-
down.
Table 9–2. I/O Pin States During Power-Down (Part 1 of 2)
Operation Transmitter Pins Receiver Pins REFCLKB Pins Rref Pin
Normal operation Transmitter Receiver Clk input Ext. reference R
Power down Tri-state (1) Tri-state (1) Tri-state (2) Low (3)