Dq output/oe path, Dq output/oe path –10 – Altera ALTDLL User Manual

Page 46

Chapter 4: Functional Description

4–10

ALTDQ_DQS Megafunction

Altera Corporation

ALTDLL and ALTDQ_DQS Megafunctions User Guide

DQ Output/OE Path

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

Figure 4–5

shows the available blocks in the DQ Output and OE path and the

connections with the ALTDQ_DQS ports.

The value for depends on your selection in the parameter editor. The possible
values are

BIDIR_DQ

and

OUTPUT_DQ

Figure 4–5. DQ Output and OE Path

Notes to

(1) The

_output_data_out

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

(2) The

_oe_out

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

(3) The

_OE_HR_DDIO_OUT

_OUTPUT_HR_DDIO_OUT_HIGH

and

_OUTPUT_HR_DDIO_OUT_LOW

blocks are half-rate

components.

_OUTPUT_DELAY_CHAIN2 (D6)

IO_CONFIG

_output_data_out

_OUTPUT_DELAY_CHAIN1 (D5)

_OUTPUT_FF

_OUTPUT_DDIO_OUT

_OUTPUT_HR_DDIO_OUT_HIGH

_hr_output_data_in

dq_output_reg_clk

_areset

and

_OUTPUT_HR_DDIO_OUT_LOW

_sreset
_areset
dq_output_reg_clkena
dq_output_reg_clk

_OE_DELAY_CHAIN2 (D6)

IO_CONFIG

_oe_out

_OE_DELAY_CHAIN1 (D5)

_OE_FF

_OE_DDIO_OE

_OE_HR_DDIO_OUT

_hr_oe_in

dq_hr_output_reg_clk

_areset

_sreset
_areset
dq_output_reg_clkena
dq_output_reg_clk

_output_data_in

_output_data_in_high

_output_data_in_low

and

DQ OUTPUT PATH

_oe_in

DQ OE PATH

This manual is related to the following products:

ALTDQ_DQS IP