Altera ALTDLL Uživatelský manuál stáhnout pdf (Strana 105)

A–4 Appendix A: Clear Box Generator

Clear Box Generator Options

ALTDLL and ALTDQ_DQS Megafunctions User Guide © February 2012 Altera Corporation

DLL_OFFSET_CTRL_A_

USE_OFFSET

String No Available values are TRUE and FALSE. It determines the

output of the

dll_offset_ctrl_a_offsetctrlout[5..0]

output bus. If set to TRUE, then depending on whether the

dll_offset_ctrl_a_addnsub input is asserted or

not, the phase offset specified on the

dll_offset_ctrl_a_offset[5..0]input bus is

added or subtracted from the DLL delay setting output to get

the dll_offset_ctrl_a_offsetctrlout[5..0]

output. If set to FALSE, the phase offset specified by the

DLL delay setting to get the

dll_offset_ctrl_a_offsetctrlout[5..0]

output. If omitted, the default is FALSE.

DLL_OFFSET_CTRL_B_

STATIC_OFFSET

String No This is a Gray-coded signed integer expressed as a string

with a range from –63 to 63. If the

DLL_OFFSET_CTRL_B_USE_OFFSET parameter is set

to FALSE, the value is added to the DLL delay-setting value

and appears as output on the

dll_offset_ctrl_a_offsetctrlout[5..0]

output bus. If the DLL_OFFSET_CTRL_B_USE_OFFSET

parameter is set to TRUE, ignore this value. The default

value is 0.

DLL_OFFSET_CTRL_B_

USE_OFFSET

String No Available values are TRUE and FALSE. It determines the

output of the

dll_offset_ctrl_b_offsetctrlout[5..0]

output bus. If set to TRUE, then depending on whether the

dll_offset_ctrl_b_addnsub input is asserted or

not, the phase offset specified on the

dll_offset_ctrl_b_offset[5..0]input bus is

added or subtracted from the DLL delay setting output to get

the dll_offset_ctrl_b_offsetctrlout[5..0]

output. If set to FALSE, the phase offset specified by the

DLL delay setting to get the

dll_offset_ctrl_b_offsetctrlout[5..0]

output. If omitted, the default is FALSE

INPUT_FREQUENCY String Yes This is the frequency of the clock connected to the clk

input port. Check this parameter value to ensure that it falls

within a valid range. This field is required and defaults to 0.

You can specify a duration by placing a time unit after the

value (for example, 2.5 ns). The value is in floating-point

format with no decimal point limit.

JITTER_REDUCTION String No Available values are TRUE and FALSE. If set to TRUE, the

jitter reduction circuit is enabled on the

dll_delayctrlout[5..0], and

dll_offset_ctrl_a_offsetctrlout[5..0]or

dll_offset_ctrl_b_offsetctrlout[5..0]

outputs and the DLL may require up to 1,024 clock cycles to

lock. If set to FALSE, the jitter reduction circuit is disabled

and the DLL only requires up to 256 clock cycles to lock. If

omitted, the default is FALSE.

Table A–1. ALTDLL Megafunction Parameters (Part 2 of 3)

Parameter Name Type Required Description

1 2 ... 100 101 102 103 104 105 106 107 108 109 110 ... 116 117

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