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4–31 Chapter 4: Functional Description
ALTDLL Megafunction Ports
ALTDLL and ALTDQ_DQS Megafunctions User Guide © February 2012 Altera Corporation
ALTDLL Megafunction Ports
This section describes the ports of the ALTDLL megafunction.
Table 4–9 lists the input ports for the ALTDLL megafunction.
Table 4–9. ALTDLL Megafunction Input Ports
Port Name
Optional/
Required Default Description
dll_aload Optional GND Asynchronous load signal for the DLL counter. When dll_aload is
HIGH, the counter is asynchronously loaded with the initial delay setting
of 16 in low-frequency mode (when the parameter
DELAY_BUFFER_MODE is set to LOW), or 32 in high-frequency mode
(when the parameter DELAY_BUFFER_MODE is set to HIGH).
dll_clk Required GND DLL reference clock that matches the frequency of the DQS clock used to
determine the delay for the phase shift. Feed this input by an input pin or
a PLL output. This input must match the polarity of its source and cannot
be inverted.
dll_offset_ctrl
_a_addnsub
Optional V
CC
Addition/subtraction control port for DLL_OFFSET_CTRL_A block.
This port controls whether the delay-offset setting A is added or
subtracted. Ignore this input if the
DLL_OFFSET_CTRL_A_USE_OFFSET parameter is set to FALSE.
If the input is V
CC
, the offset is added; if it is GND, the offset is
subtracted.
dll_offset_ctrl
_a_offset[5..0]
Optional 0 This is the offset input setting for DLL_OFFSET_CTRL_A block. This
is a Gray-coded offset added or subtracted from the current value of the
DLL's delay setting to get the
dll_offset_ctrl_a_offsetctrlout result. Ignore this input
if the DLL_OFFSET_CTRL_A_USE_OFFSET parameter is set to
FALSE. The offset is limited to a minimum value of 0 and a maximum
value of 63 in low-frequency mode, and a maximum value of 31 in
high-frequency mode.
dll_offset_ctrl
_b_addnsub
Optional V
CC
This is the addition/subtraction control port for
DLL_OFFSET_CTRL_B block. This port controls whether the
delay-offset setting B is added or subtracted. Ignore this input if the
DLL_OFFSET_CTRL_B_USE_OFFSET parameter is set to FALSE.
If the input is V
CC
, the offset is added; if it is GND, the offset is
subtracted. This input defaults to V
CC
.
dll_offset_ctrl
_b_offset[5..0]
Optional 0 This is the offset input setting for DLL_OFFSET_CTRL_B block. This
is a Gray-coded offset added or subtracted from the current value of the
DLL's delay setting to get the
dll_offset_ctrl_b_offsetctrlout result. Ignore this input
if the DLL_OFFSET_CTRL_B_USE_OFFSET parameter is set to
FALSE. The offset is limited to a minimum value of 0 and a maximum
value of 63 in low-frequency mode, and a maximum value of 31 in
high-frequency mode.
- ALTDLL and ALTDQ_DQS 1
- Megafunctions User Guide 1
- UG-01032-5.0 2
- Contents 3
- 1. About these Megafunctions 5
- Features 6
- 2. Getting Started 7
- ALTOCT Megafunction 8
- Customized Controller Logic 8
- Simulate the Design 9
- Create Timing Constraints 9
- Adjust Constraints 10
- Generate the Megafunctions 11
- Settings Value 13
- Turned off 14
- Enable DQS delay chain 14
- 3. Parameter Settings 19
- [5..0] output port 20
- ALTDLL Parameter Editor 21
- ALTDQ_DQS Parameter Editor 23
- Reset/Config Ports 26
- ports on the megafunction 27
- — DQS_OFFSETCTRL_ 27
- inputs to be registered by 28
- signals of 28
- “DQ Input Path” on page 4–8 29
- 4. Functional Description 37
- ■ DQS Input Path 38
- ■ DQ Input Path 38
- ■ DQ Output/OE Path 38
- ■ DQS Output/OE Path 38
- ■ DQ/DQS OCT Path 38
- ALTDLL Megafunction 39
- ALTDQ_DQS Megafunction 40
- DQS Input Path 42
- DQ Input Path 44
- DQ Output/OE Path 46
- DQS Output/OE Path 48
- DQ/DQS OCT Path 50
- Delay Chains 51
- Deskew Delay Chains 52
- Note to Figure 4–13: 55
- Note to Figure 4–14: 55
- Note to Figure 4–15: 56
- Note to Figure 4–16: 56
- Note to Figure 4–17: 57
- DQS_CONFIG / IO_CONFIG Block 58
- ALTDLL Megafunction Ports 67
- ALTDQ_DQS Megafunction Ports 69
- DQ OE Path Megafunction Ports 78
- DQSn I/O Path Ports 79
- DQS_CONFIG/IO_CONFIG path 81
- RLDRAM interfaces 84
- Procedure 85
- 00 FF 00 FF 99
- ■ bidir_dq_io[0] 100
- A. Clear Box Generator 102
- Clear Box Generator Options 103
- Clear Box Parameters 104
- inputs are 108
- OUTPUT_DQ 114
- Additional Information 116
- Typographic Conventions 117
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