Altera ALTDLL Instrukcja Użytkownika Pobierz pdf (Strona 46)

Chapter 4: Functional Description 4–10

ALTDQ_DQS Megafunction

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

1 2 ... 41 42 43 44 45 46 47 48 49 50 51 ... 116 117

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