Altera ALTDLL - Manual (Page 46)

Chapter 4: Functional Description 4–10
ALTDQ_DQS Megafunction
© February 2012 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.
1 The value for <IO> 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 (Note 1) , (2) , (3)
Notes to Figure 4–5 :
(1) The <IO> _output_data_out port must be connected to the input port of the output buffer.
(2) The <IO> _oe_out port must be connected to the output enable port of the output buffer.
(3) The <IO> _OE_HR_DDIO_OUT , <IO> _OUTPUT_HR_DDIO_OUT_HIGH and <IO> _OUTPUT_HR_DDIO_OUT_LOW blocks are half-rate
components.
<IO>_OUTPUT_DELAY_CHAIN2 (D6)
IO_CONFIG
<io>_output_data_out
<IO>_OUTPUT_DELAY_CHAIN1 (D5)
<IO>_OUTPUT_FF
<IO>_OUTPUT_DDIO_OUT
<IO>_OUTPUT_HR_DDIO_OUT_HIGH
<io>_hr_output_data_in
dq_output_reg_clk
<io>_areset
and
<IO>_OUTPUT_HR_DDIO_OUT_LOW
<io>_sreset
<io>_areset
dq_output_reg_clkena
dq_output_reg_clk
<IO>_OE_DELAY_CHAIN2 (D6)
IO_CONFIG
<io>_oe_out
<IO>_OE_DELAY_CHAIN1 (D5)
<IO>_OE_FF
<IO>_OE_DDIO_OE
<IO>_OE_HR_DDIO_OUT
<io>_hr_oe_in
dq_hr_output_reg_clk
<io>_areset
<io>_sreset
<io>_areset
dq_output_reg_clkena
dq_output_reg_clk
<io>_output_data_in
<io>_output_data_in_high
<io>_output_data_in_low
and
DQ OUTPUT PATH
<io>_oe_in
DQ OE PATH