Altera ALTDLL Instrukcja Użytkownika Pobierz pdf (Strona 68)

Chapter 4: Functional Description 4–32

ALTDLL Megafunction Ports

Table 4–10 lists the output ports of the ALTDLL megafunction.

Table 4–10. ALTDLL Megafunction Output Ports

Port Name

Optional/

Required Default Function

dll_delayctrlout

[5..0]

Required — This is the DLL's delay setting output. This is a

1-cycle-delayed value of the current delay chain setting of

the DLL. This signal is Gray-coded to minimize jitter due to

toggling.This signal can feed the dll_delayctrlin

input port of the ALTDQ_DQS megafunction or the core

logic. This output is available for SignalTap

II Embedded

Logic Analyzer.

dll_dqsupdate Optional — This is an update-enable signal for the delay-setting

latches of the DQS pins. This signal can feed the

dqsupdateen input port of the ALTDQ_DQS

megafunction. This output is not available for SignalTap II

Embedded Logic Analyzer.

dll_offset_ctrl_a_

offsetctrlout[5..0]

Optional — This is the

offsetctrlout output setting for

DLL_OFFSET_CTRL_A block. This is a registered

Gray-coded value of the delay-offset setting A. This output

can be adjusted based on the value of the

dll_offset_ctrl_a_use_offset parameter. This

signal can feed the offsetctrlin input port of the

ALTDQ_DQS megafunction. This signal is not available for

SignalTap II Embedded Logic Analyzer.

dll_offset_ctrl_b_

offsetctrlout[5..0]

Optional — This is the offsetctrlout output setting for

DLL_OFFSET_CTRL_B block. This is a registered

Gray-coded value of the delay-offset setting B. This output

can be adjusted based on the value of the

dll_offset_ctrl_b_use_offset parameter. This

signal can feed the offsetctrlin input port of the

ALTDQ_DQS megafunction. This signal is not available for

SignalTap II Embedded Logic Analyzer.

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