Altera ALTDLL Manuel d'utilisateur télécharger pdf (Page 89)

4–53 Chapter 4: Functional Description

Design Example: Implementing Half-Rate DDR2 Interface in Stratix III

ALTDLL and ALTDQ_DQS Megafunctions User Guide © February 2012 Altera Corporation

8. On the DQ OUT/OE page, specify the parameters as shown in Table 4–30. These

parameters configure the DQ OUTPUT and DQ OE path of the ALTDQ_DQS

instance.

9. On the Half-rate page, specify the parameters as shown in Table 4–31. These

parameters configure the half-rate settings of the ALTDQ_DQS instance.

10. On the DQSn I/O page, specify the parameters as shown in Table 4–32. .

11. On the Reset/Config Ports page, specify the parameters as shown in Table 4–33.

Use DQ half rate ‘dataoutbypass’ port — Turned off

Use DQ input delay chain — Turned on

Table 4–30. Advance Options (DQ OUT/OE)

Parameter Value

Enable DQ output delay chain1 Turned on

Enable DQ output delay chain2 Turned on

DQ output register mode DDIO

Enable DQ output enable Turned on

Enable DQ output enable delay chain1 Turned on

Enable DQ output enable delay chain2 Turned on

DQ output enable register mode DDIO

Table 4–31. Advance Options (Half-Rate)

Parameter Value

IO Clock Divider Source Core

Create ‘io_clock_divider_masterin’ input port Turned off

Create ‘io_clock_divider_clkout’ output port Turned on

Create ‘io_clock_divider_slaveout’ output port Turned off

IO Clock Divider Invert Phase Never

Table 4–32. Advanced Options (DQS/DQSn IO)

Parameter Value

Use DQSn IO Turned on

DQS and DQSn IO Configuration mode Differential Pair

Table 4–33. Advanced Options (Reset and Config Ports) (Part 1 of 2)

Parameter Value

Create ‘dqs_areset’ input port Turned on

Create ‘dqs_sreset’ input port Turned on

Create ‘input_dq_areset’ input port Turned off

Create ‘input_dq_sreset’ input port Turned off

Create ‘output_dq_areset’ input port Turned off

Table 4–29. Advance Options (DQ IN) (Part 2 of 2)

Parameter Sub-options Value

1 2 ... 84 85 86 87 88 89 90 91 92 93 94 ... 116 117

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Altera ALTDLL Manuel d'utilisateur Page 89