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22 www.xilinx.com 7 Series FPGAs SelectIO Resources User Guide
UG471 (v1.5) May 15, 2015
Chapter 1: SelectIO Resources
DCIRESET Primitive
DCIRESET is a Xilinx design primitive that provides the capability to perform a reset of the
DCI controller state machine during normal operation of the design. Unless
DCIUpdateMode is set to Quiet (see DCIUpdateMode Configuration Option) or for the
case outlined below related to the use of multi-function pins set to use DCI, for most
situations this primitive should not be required in a design. See UG768
: Xilinx 7 Series
FPGA Libraries Guide for HDL Designs for more details on the DCIRESET primitive.
Special DCI Requirements for Some Banks
If any of the multi-function pins in I/O banks 14 or 15 (any device), or banks 11, 12, 17, 18,
20, and 21 (SSI devices only) are assigned DCI I/O standards in the user design, the
DCIRESET primitive should also be included and used in the design. In that case, the
design should pulse the RST input of DCIRESET and then wait for the LOCKED signal to
be asserted prior to using any user input or outputs on these pins with DCI standards. This
is required because these I/O pins ignore the initial DCI calibration that happens during
the normal device initialization.
As a result, if the DCIRESET primitive had not been used and DCIUpdateMode was set to
AsRequired, after those pins become normal I/O pins there would be an indeterministic
delay between the end of configuration and when the DCI calibration algorithm updated
those pins DCI settings. If DCIRESET was not used and DCIUpdateMode was set to Quiet,
these pins would never have their DCI values set. In that case, the Controlled Impedance
DCI I/O standards (such as LVDCI_18) would behave as if in the high-Z state all the time,
and Split Termination DCI I/O standards (such as SSTL15_DCI) would behave as if there
was no internal termination. Including and using the DCIRESET primitive in the design
allows these pins to have DCI I/O standards and to perform without issue.
DCI Cascading
The 7 series FPGA HP I/O banks using DCI I/O standards have the option of deriving the
DCI impedance values from another HP I/O bank. As shown in Figure 1-6, a digital
control bus is internally distributed throughout the bank to control the impedance of each
I/O.
With DCI cascading, one I/O bank (the master bank) must have its VRN/VRP pins
connected to external reference resistors. Other I/O banks in the same HP I/O bank
column (slave banks) can use DCI standards with the same impedance as the master bank,
without connecting the VRN/VRP pins on these slave banks to external resistors. DCI
impedance control in cascaded banks is received from the I/O master bank.
X-Ref Target - Figure 1-6
Figure 1-6: DCI Use within a Bank
UG471_c1_08_101810
DCI VRN/VRP
From Bank Above
From Bank Below
To
Local
Bank
- 7 Series FPGAs 1
- SelectIO Resources 1
- Revision History 2
- Table of Contents 5
- UG471 (v1.5) May 15, 2015 10
- About This Guide 11
- Preface: About This Guide 12
- New Features 14
- 7 Series FPGA I/O Bank Rules 17
- Introduction 19
- Xilinx DCI 20
- DCIRESET Primitive 22
- DCI Cascading 22
- DCI and 3-state DCI (T_DCI) 28
- DCI Usage Examples 31
- IBUF and IBUFG 35
- IBUF_IBUFDISABLE 35
- IBUF_INTERMDISABLE 36
- IBUFDS and IBUFGDS 36
- IBUFDS_DIFF_OUT_IBUFDISABLE 37
- IBUFDS_IBUFDISABLE 37
- IBUFDS_INTERMDISABLE 38
- IBUFDS_DIFF_OUT_INTERMDISABLE 38
- IOBUF_DCIEN 39
- IOBUF_INTERMDISABLE 40
- IOBUFDS_DCIEN 41
- IOBUFDS_DIFF_OUT 42
- IOBUFDS_DIFF_OUT_DCIEN 43
- IOBUFDS_INTERMDISABLE 44
- DCI_CASCADE Constraint 46
- Location Constraints 47
- IOSTANDARD Attribute 47
- IBUF_LOW_PWR Attribute 47
- Output Slew Rate Attributes 48
- VCCAUX_IO Constraint 50
- LVTTL (Low Voltage TTL) 51
- LVCMOS (Low Voltage CMOS) 54
- LVDCI _ DV2 57
- HSLVDCI (High-Speed LVDCI) 59
- HSTL_ I and HSTL_ I_18 60
- HSTL_I_12 60
- HSTL_ II and HSTL_ II_18 60
- N/A Available 62
- External Termination 63
- Differential HSTL Class I 64
- HSTL Class II 66
- Differential HSTL Class II 68
- Not 3-stated 72
- (T pin logic Low) 72
- 3-stated 72
- (T pin logic High) 72
- SSTL18_I, DIFF_SSTL18_I 76
- DIFF_SSTL135 76
- User Guide for details 77
- HSUL_12 and DIFF_HSUL_12 84
- Example Board Topology 85
- Differential HSUL_12 86
- MOBILE_DDR (Low Power DDR) 88
- Transmitter Termination 91
- Receiver Termination 91
- Differential Clock 93
- Input to the FPGA 93
- BLVDS (Bus LVDS) 96
- Table 1-55: V 99
- Chapter 1: SelectIO Resources 102
- SelectIO Logic Resources 105
- ILOGIC Resources 106
- ZHOLD_DELAY 108
- OPPOSITE_EDGE Mode 109
- SAME_EDGE Mode 110
- SAME_EDGE_PIPELINED Mode 110
- Input DDR Resources (IDDR) 111
- ILOGIC Timing Models 112
- Clock Event 4 113
- Clock Event 1 113
- Clock Event 9 114
- IDELAYE2 Primitive 115
- IDELAY Ports 116
- IDELAYRESOLUTION 117
- IDELAY Attributes 118
- IDELAY Modes 119
- IDELAY Timing 120
- Clock Event 2 121
- Clock Event 3 121
- Clock Event 0 122
- IDELAYCTRL 123
- IDELAYCTRL Timing 124
- IDELAYCTRL Locations 124
- OLOGIC Resources 125
- Output DDR Overview (ODDR) 126
- Clock Forwarding 127
- Output DDR Primitive (ODDR) 128
- OLOGIC Timing Models 128
- Timing Characteristics 129
- ODELAYE2 Primitive 133
- ODELAY Ports 134
- ODELAY Attributes 136
- ODELAY Modes 137
- ODELAY Timing 138
- Chapter 3 141
- ISERDESE2 143
- Primitive 143
- Registered Outputs – Q1 to Q8 144
- Combinatorial Output – O 145
- Bitslip Operation - BITSLIP 145
- High-Speed Clock Input - CLK 146
- High-Speed Clock Input - CLKB 146
- Divided Clock Input - CLKDIV 146
- Oversampling Mode - OCLK 147
- Reset Input - RST 147
- ISERDESE2 Attributes 148
- DATA_RATE Attribute 149
- DATA_WIDTH Attribute 149
- INTERFACE_TYPE Attribute 149
- ISERDESE2 Clocking Methods 150
- MEMORY Interface Type 151
- MEMORY_QDR Interface Type 151
- OVERSAMPLE Interface Type 151
- ISERDESE2 Width Expansion 153
- OSERDESE2 154
- BITSLIP Submodule 156
- After Clock Event 3 158
- OSERDESE2 Primitive 160
- Data Path Output - OQ 161
- DATA_RATE_OQ Attribute 163
- DATA_RATE_TQ Attribute 163
- SERDES_MODE Attribute 164
- TRISTATE_WIDTH Attribute 164
- OSERDESE2 Width Expansion 165
- Output Feedback 166
- OSERDESE2 Latencies 166
- IO_FIFO Overview 171
- FIFO Core 172
- 7 Entries Deep 172
- Register Register 172
- IN_FIFO Primitive 173
- Table 3-15: IN_FIFO Ports 174
- OUT_FIFO 175
- OUT_FIFO Primitive 176
- Table 3-18: OUT_FIFO Ports 177
- Resetting the IO_FIFO 178
- EMPTY and FULL Flags 178
- Termination Options for 181
- SSO Noise Analysis 181
- TMDS_33 Far 3.3V 50Ω 183
- IO Standard 183
- Default Termination 183
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