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4–3 Chapter 4: Functional Description
ALTDLL Megafunction
ALTDLL and ALTDQ_DQS Megafunctions User Guide © February 2012 Altera Corporation
ALTDLL Megafunction
This section describes the DLL block and the DLL offset control blocks associated with
the ALTDLL megafunction.
DLL block and DLL offset control block
The ALTDLL megafunction controls the DLL and its two associated phase-offset
control blocks. The ALTDLL megafunction also controls the delay-chain settings to
achieve a compensated delay for PVT. For example, a DQS read strobe/clock that is
edge-aligned to its associated read data can be used to clock the data into I/O
registers if the data is delayed before reaching the register.
The DLL consists of two phase-offset control blocks— one for each edge adjacent to
the DLL, which resides in the corner of the device. Both phase-offset control blocks
cannot feed the same edge.
The DLL block computes the necessary delay settings by comparing the period of an
input reference clock to the delay through an internal delay chain. You can then use
the DLL offset control block to fine-tune the delay setting.
At a minimum, the DLL has a single input that is connected to a dedicated PLL output
or input pin, and six gray-coded outputs that are connected to the DQS delay chain
block, which is part of the ALTDQ_DQS megafunction.
Figure 4–2 shows the components of the ALTDLL megafunction. The
DLL_OFFSET_CTRL_A block is the first phase-offset control block, and the
DLL_OFFSET_CTRL_B block is the second phase-offset control block. These two
phase-offset control blocks are connected together to form the ALTDLL megafunction.
Each offset control block can only control the DQS delay chains on one edge of the
device. To feed the same offset to the DQS delay chains on two edges, you must use
both phase-offset control blocks.
Figure 4–2. ALTDLL Megafunction
DLL
DLL_OFFSET_CTRL_A
DLL_OFFSET_CTRL_B
offsetdelayctrlin
clk
aload
aload
clk
offsetdelayctrlin
offsetdelayctrlclkout
offsetdelayctrlout
delayctrlout
dqsupdate
clk
aload
offset
dll_offset_ctrl_a_offset[ ]
addnsub
dll_offset_ctrl_a_addnsub
offsetctrlout
offsetctrlout
offset
dll_offset_ctrl_b_offset[ ]
addnsub
dll_offset_ctrl_b_addnsub
dll_clk
dll_aload
dll_offset_ctrl_a_offsetctrlout[ ]
dll_delayctrlout[ ]
dll_dqsupdate
dll_offset_ctrl_b_offsetctrlout[ ]
ALTDLL
- 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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