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4–35 Chapter 4: Functional Description

ALTDQ_DQS Megafunction Ports

ALTDLL and ALTDQ_DQS Megafunctions User Guide © February 2012 Altera Corporation

DQS Output Path Megafunction Ports

Table 4–12 summarizes all the ports on the megafunction that configure the DQS

output path.

Table 4–12. Megafunction Ports to Configure DQS Output Path

Port Name Type

Optional/

Required Default Description

dqs_areset Input Optional GND This port is connected to the DQS_OUTPUT_FF:clrn,

DQS_OUTPUT_DDIO_OUT:areset, and

DQS_OUTPUT_HR_DDIO_OUT_HIGH/_LOW:ares

et ports that is used to asynchronously reset all

registers in those blocks.

dqs_hr_output_data_

in[3..0]

Input Optional GND This port feeds the half-rate data to the

DQS_OUTPUT_HR_DDIO_OUT_HIGH:datainhi /

datainlo and

DQS_OUTPUT_HR_DDIO_OUT_LOW:datainhi /

datainlo ports.

dqs_hr_output_reg_clk Input Optional GND This port feeds the clock signal for the

DQS_OUTPUT_HR_DDIO_OUT_HIGH:clkh /

clklo / muxsel and

DQS_OUTPUT_HR_DDIO_OUT_LOW:clkhi /

clklo / muxsel ports.

dqs_output_data_in Input Optional GND This port feeds the DQS_OUTPUT_FF:d,

DQS_OUTPUT_DELAY_CHAIN1:datain,

DQS_OUTPUT_DELAY_CHAIN2:datain, or

dqs_output_data_out port.

dqs_output_data_in_

high

Input Optional GND This port feeds the

DQS_OUTPUT_DDIO_OUT:datainhi port that is

the full-rate data for the rising edge.

dqs_output_data_in_low Input Optional GND This port feeds the

DQS_OUTPUT_DDIO_OUT:datainlo port that is

the full-rate data for the falling edge.

dqs_output_data_out Output Optional — This port can be driven by the

DQS_OUTPUT_DELAY_CHAIN2:dataout,

DQS_OUTPUT_DELAY_CHAIN1:dataout,

DQS_OUTPUT_FF:q,

DQS_OUTPUT_DDIO_OUT:dataout, or

dqs_output_data_in port.

dqs_output_reg_clk Input Optional GND This port is connected to the DQS_OUTPUT_FF:clk

and the

DQS_OUTPUT_DDIO_OUT:clkhi/clklo/muxsel

ports that is used to clock the registers in those blocks.

dqs_output_reg_clkena Input Optional V

This port is connected to the DQS_OUTPUT_FF:ena

and the DQS_OUTPUT_DDIO_OUT:ena ports that is

used as output enable for the registers in those block.

dqs_sreset Input Optional GND This port is connected to the DQS_OUTPUT_FF:sclr

and DQS_OUTPUT_DDIO_OUT:sreset ports that is

used to synchronously reset all registers in those blocks.

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