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7 Series FPGAs SelectIO Resources User Guide www.xilinx.com 175
UG471 (v1.5) May 15, 2015
IO_FIFO Overview
OUT_FIFO
The OUT_FIFO is co-located with the IN_FIFO and is also physically aligned to an I/O
byte group for optimized performance. The 8-entry deep OUT_FIFO supports data
transfer using two modes of operation:
• 4 x 4 mode – This mode configures the FIFO to have 12 4-bit wide data inputs (D) and
12 4-bit wide data outputs (Q). The D0[3:0] – D9[3:0] ports map to the Q0[3:0] –
Q9[3:0] ports. D5[7:4] and D6[7:4] are the two extra data input ports that serve as D10
and D11 and map to the Q5[7:4] and Q6[7:4] output ports. The other D[7:4] ports are
not used. Table 3-16 shows the 4 x 4 mode mapping in detail.
• 8 x 4 mode – This mode configures the FIFO to have 10 8-bit wide data inputs (D) and
10 4-bit wide data outputs (Q). In 8 x 4 mode, a 2:1 multiplexer in the output datapath
serializes the 8-bit input data to the 4-bit output data width. 4 x 8 mode is generally
Q5[7:4], Q6[7:4]
O
Supplemental data out ports Q10 and Q11. Used only in 4x4
mode. Data on these ports is sourced from corresponding
input ports D5[7:4] and D6[7:4].
EMPTY
O
Empty flag. Synchronized to RDCLK.
FULL
O
Full flag. Synchronized to WRCLK.
ALMOSTEMPTY
(1)
O
Programmable level empty flag. Synchronized to RDCLK.
ALMOSTFULL
(1)
O
Programmable level full flag. Synchronized to WRCLK.
Notes:
1. The corresponding attribute can be set to a value of 1 or 2 (see Table 3-19, page 179). Accordingly, at
least one or two reads or writes occur after the flag asserts. Due to the asynchronous nature of the FIFO,
there can be one or two additional reads or writes increasing the total reads or writes to three or four.
Table 3-15: IN_FIFO Ports (Cont’d)
Port Name Input/output Description
Table 3-16: OUT_FIFO Input to Output Data Mapping in 4 x 4 Mode
Mapping Not Used
D0[3:0] → Q0[3:0] Q0[7:4]
D1[3:0] → Q1[3:0] Q1[7:4]
D2[3:0] → Q2[3:0] Q2[7:4]
D3[3:0] → Q3[3:0] Q3[7:4]
D4[3:0] → Q4[3:0] Q4[7:4]
D5[3:0] → Q4[3:0]
D6[3:0] → Q6[3:0]
D7[3:0] → Q7[3:0] Q7[7:4]
D8[3:0] → Q8[3:0] Q8[7:4]
D9[3:0] → Q9[3:0] Q9[7:4]
D10[7:4] is D5[7:4] → Q5[7:4]
D11[7:4] is D6[7:4] → Q6[7:4]
- 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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