Dqs output/oe path, Dqs output/oe path –12 – Altera ALTDLL User Manual

Page 48

Chapter 4: Functional Description

4–12

ALTDQ_DQS Megafunction

Altera Corporation

ALTDLL and ALTDQ_DQS Megafunctions User Guide

DQS Output/OE Path

This path sends the DQS strobe signal to the external memory for writing operations.

Figure 4–6

shows the available blocks in the DQS output and OE path and the

connections with the ALTDQ_DQS ports.

Figure 4–6. DQS Output and OE Path

Notes to

(1) The

dqs_output_data_out

port must be connected to the input port of the output buffer.

(2) The

dqs_oe_out

port must be connected to the output enable port of the output buffer.

(3) The

DQS_OE_HR_DDIO_OUT

DQS_OUTPUT_HR_DDIO_OUT_HIGH

and

DQS_OUTPUT_HR_DDIO_OUT_LOW

blocks are half-rate

components.

DQS_OUTPUT_DELAY_CHAIN2 (D6)

IO_CONFIG

dqs_output_data_out

DQS_OUTPUT_DELAY_CHAIN1 (D5)

DQS_OUTPUT_FF

DQS_OUTPUT_DDIO_OUT

DQS_OUTPUT_HR_DDIO_OUT_HIGH

dqs_hr_output_data_in

dqs_output_reg_clk

dqs_areset

and

DQS_OUTPUT_HR_DDIO_OUT_LOW

dqs_sreset
dqs_areset
dqs_output_reg_clkena
dqs_output_reg_clk

DQS_OE_DELAY_CHAIN2 (D6)

IO_CONFIG

dqs_oe_out

DQS_OE_DELAY_CHAIN1 (D5)

DQS_OE_FF

DQS_OE_DDIO_OE

DQS_OE_HR_DDIO_OUT

dqs_hr_oe_in

dqs_hr_output_reg_clk

dqs_areset

dqs_sreset
dqs_areset
dqs_output_reg_clkena
dqs_output_reg_clk

dqs_output_data_in

dqs_output_data_in_high

dqs_output_data_in_low

and

DQS OUTPUT PATH

dqs_oe_in

DQS OE PATH

This manual is related to the following products:

ALTDQ_DQS IP