Basic FPGA Architectures in Spartan 6 and Virtex 6/7 Families

This module provides an overview of the basic slice and I/O resources available in Spartan 6 FPGAs, as well as dedicated hardware features and differences between the Spartan 6 and Virtex 6/7 families.

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About Basic FPGA Architectures in Spartan 6 and Virtex 6/7 Families

PowerPoint presentation about 'Basic FPGA Architectures in Spartan 6 and Virtex 6/7 Families'. This presentation describes the topic on This module provides an overview of the basic slice and I/O resources available in Spartan 6 FPGAs, as well as dedicated hardware features and differences between the Spartan 6 and Virtex 6/7 families.. The key topics included in this slideshow are FPGA, Spartan 6, Virtex 6, Virtex 7, slice resources, I/O resources, hardware features,. Download this presentation absolutely free.

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2. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Objectives After completing this module, you will be able to: Describe the basic slice resources available in Spartan-6 FPGAs Identify the basic I/O resources available in Spartan-6 FPGAs List some of the dedicated hardware features of Spartan-6 FPGAs Differentiate the Virtex-6 family of devices from the Spartan-6 family Identify latest members of Virtex-7 device family Basic Architecture 2

3. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Basic Architecture 3 Outline Overview Logic Resources I/O Resources Memory and DSP48 Clocking Resources Latest Families Virtex-6 Family Virtex-7 Family Summary

4. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Basic Architecture 4 Overview All Xilinx FPGAs contain the same basic resources Logic Resources Slices (grouped into CLBs) Contain combinatorial logic and register resources Memory Multipliers Interconnect Resources Programmable interconnect IOBs Interface between the FPGA and the outside world Other resources Global clock buffers Boundary scan logic

6. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Spartan-6 Lowest Total Power 45 nm technology Static power reductions Process & architectural innovations Dynamic power reduction Lower node capacitance & architectural innovations More hard IP functionality Integrated transceivers & other logic reduces power Hard IP uses less current & power than soft IP Lower IO power Low power option -1L reduces power even further Fewer supply rails reduces power Two families: LX and LXT Basic Architecture 6

7. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Spartan-6 LX / LXT FPGAs ** All memory controller support x16 interface, except in CS225 package where x8 only is supported Basic Architecture 7

8. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Basic Architecture 8 Outline Overview Logic Resources I/O Resources Memory and DSP48 Clocking Resources Latest Families Virtex-6 Family Virtex-7 Family Summary

9. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Spartan-6 FPGA CLB CLB contains two slices Connected to switch matrix for routing to other FPGA resources Carry chain runs vertically through Slice0 only Switch Matrix Slice0 Slice1 CIN COUT Basic Architecture 9

10. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Three Types of Slices in Spartan-6 FPGAs SLICEM: Full slice LUT can be used for logic and memory/SRL Has wide multiplexers and carry chain SLICEL: Logic and arithmetic only LUT can only be used for logic (not memory) Has wide multiplexers and carry chain SLICEX: Logic only LUT can only be used for logic (not memory) No wide multiplexers or carry chain SLICEX SLICEX SLICEM SLICEM SLICEX SLICEX SLICEL SLICEL or or Basic Architecture 10

11. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Spartan-6 CLB Logic Slices LUT6 8 Registers Carry Logic Wide Function Muxes Distributed RAM / SRL logic SliceM (25%) SliceM (25%) SliceL (25%) SliceL (25%) SliceX (50%) SliceX (50%) LUT6 8 Registers Carry Logic Wide Function Muxes LUT6 Optimized for Logic 8 Registers Slice mix chosen for the optimal balance of Cost, Power & Performance Basic Architecture 11

12. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Spartan-6 FPGA SLICE Four LUTs Eight storage elements Four flip-flop/latches Four flip-flops F7MUX and F8MUX Connects LUT outputs to create wide functions Output can drive the flip-flop/latches Carry chain (Slice0 only) Connected to the LUTs and the four flip-flop/latches Basic Architecture 12

13. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only 6-Input LUT with Dual Output 6-input LUT can be two 5-input LUTs with common inputs Minimal speed impact to a 6-input LUT One or two outputs Any function of six variables or two independent functions of five variables 5-LUT D A5 A4 A3 A2 A1 5-LUT D A5 A4 A3 A2 A1 A6 A5 A4 A3 A2 A1 O6 O5 6-LUT 6-LUT Basic Architecture 13

14. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Slice Flip-Flop and Flip- Flop/Latch Control All flip-flops and flip-flop/latches share the same CLK, SR, and CE signals This is referred to as the control set of the flip- flops CE and SR are active high CLK can be inverted at the slice boundary Set/Reset (SR) signal can be configured as synchronous or asynchronous All four flip-flop/latches are configured the same All four flip-flops are configured the same SR will cause the flip-flop to be set to the state specified by the SRINIT attribute D CE SR Q CK D CE SR Q CK D CE SR Q CK D CE SR Q CK DFF/LATCH AFF/LATCH AFF DFF D Basic Architecture 14

16. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Shift Register LUT Example Operation D - NOP must add 17 pipeline stages of 64 bits each 1,088 flip-flops (hence 136 slices) or 64 SRLs (hence 16 slices) 20 Cycles 64 Operation A 8 Cycles 8 Cycles 12 Cycles 12 Cycles Operation B 3 Cycles 3 Cycles Operation C 64 20 Cycles Paths are Statically Balanced 17 Cycles 17 Cycles Operation D - NOP Basic Architecture 16

17. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Basic Architecture 17 Outline Overview Logic Resources I/O Resources Memory and DSP48 Clocking Resources Latest Families Virtex-6 Family Virtex-7 Family Summary

18. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only I/O Block Diagram Electrical Resources N P LVDS Termination Logical Resources Interconnect to FPGA fabric Master IOSERDES IODELAY IOLOGIC Slave IOSERDES IODELAY IOLOGIC Basic Architecture 18

19. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Spartan-6 FPGA Supports 40+ Standards Each input can be 3.3 V compatible LVCMOS (3.3 V, 2.5 V, 1.8 V, 1.5 V, and 1.2 V) LVCMOS_JEDEC LVPECL (3.3 V, 2.5 V) PCI I2C* HSTL (1.8 V, 1.5 V; Classes I, II, III, IV) DIFF_HSTL_I, DIFF_HSTL_I_18 DIFF_HSTL_II* SSTL (2.5 V, 1.8 V; Classes I, II) DIFF_SSTL_I, DIFF_SSTL18_I DIFF_SSTL_II* LVDS, Bus LVDS RSDS_25 (point-to-point) Easier and More Flexible I/O Design! Easier and More Flexible I/O Design! * Newly added standards Basic Architecture 19

20. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Spartan-6 FPGA I/O Bank Structure All I/Os are on the edges of the chip I/Os are grouped into banks 30 ~ 83 I/O per banks Eight clock pins per edge Common VCCO, VREF Restricts mixture of standards in one bank The differential driver is only available in Bank0 and Bank2 Differential receiver is available in all banks On-chip termination is available in all banks BANK 0 BANK 2 BANK 4 BANK 5 BANK 3 BANK 1 BANK 0 BANK 2 BANK 3 BANK 1 Chip View (LX45/T and Smaller) Chip View (LX100/T and Larger) Basic Architecture 20

21. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only I/O Logical Resources Two IOLOGIC block per I/O pair Master and slave Can operate independently or concatenated Each IOLOGIC contains IOSERDES Parallel to serial converter (serializer) Serial to parallel converter (De-serializer) IODELAY Selectable fine-grained delay SDR and DDR resources Interconnect to FPGA Fabric Master IOSERDES IODELAY IOLOGIC Slave IOSERDES IODELAY IOLOGIC Basic Architecture 21

22. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Basic Architecture 22 Outline Overview Logic Resources I/O Resources Memory and DSP48 Clocking Resources Latest Families Virtex-6 Family Virtex-7 Family Summary

23. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only SLICEM Used as Distributed SelectRAM Memory Uses the same storage that is used for the look-up table function Synchronous write, asynchronous read Can be converted to synchronous read using the flip-flops available in the slice Various configurations Single port One LUT6 = 64x1 or 32x2 RAM Cascadable up to 256x1 RAM Dual port ( D ) 1 read / write port + 1 read-only port Simple dual port ( SDP ) 1 write-only port + 1 read-only port Quad-port ( Q ) 1 read / write port + 3 read-only ports Single Port Dual Port Simple Dual Port Quad Port 32x2 32x4 32x6 32x8 64x1 64x2 64x3 64x4 128x1 128x2 256x1 32x2 D 32x4 D 64x1 D 64x2 D 128x1 D 32x6 SDP 64x3 SDP 32x2 Q 64x1 Q Each port has independent address inputs Basic Architecture 23

24. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Spartan-6 FPGA Block RAM Features 18 kb size Can be split into two independent 9-kb memories Performance up to 300 MHz Multiple configuration options True dual-port, simple dual-port, single-port Two independent ports access common data Individual address, clock, write enable, clock enable Independent widths for each port Byte-write enable Dual-Port BRAM Dual-Port BRAM 18k Memory 18k Memory Basic Architecture 24

25. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Better, More BRAM More Block RAMs 2x higher BRAM to Logic Cell ratio than Spartan-3A platform More port flexibility 18K can be split into two 9K BRAM blocks and can be independently addressed Improves buffering, caching & data storage Excellent for embedded processing, communication protocols Enables DSP blocks to provide more efficient video and surveillance algorithms Lower Static Power Basic Architecture 25

26. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Memory Controller Only low cost FPGA with a hard memory controller Guaranteed memory interface performance providing Reduced engineering & board design time DDR, DDR2, DDR3 & LP DDR support Up to 12.8Mbps bandwidth for each memory controller Automatic calibration features Multiport structure for user interface Six 32-bit programmable ports from fabric Controller interface to 4, 8 or 16 bit memories devices Basic Architecture 26

27. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Spartan-6 Hard Memory Controller New Hard Block Memory Controller Up to 4 controllers per device Why a Hard Memory Block? Very common design component Multiple customer benefits Customer Requests Spartan-6 Hard Block Memory Controller Benefits Higher performance Up to 800 Mbps Lower cost Saves soft logic, smaller die Lower power Dedicated logic Easier designs Timing closure no longer an issue Configurable MultiPort user interface CoreGen/MIG wizard & EDK support Basic Architecture 27

29. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Basic Architecture 29 Outline Overview Logic Resources I/O Resources Memory and DSP48 Clock Resources Latest Families Virtex-6 Family Virtex-7 Family Summary

30. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Spartan-6 FPGA Global Clock Network 16 global clock buffers in the Spartan-6 FPGA allow clocks to be distributed to potentially every clocked element on the die 16 HCLK lines connect clock signals to logic resources in each row HCLK lines can be driven by Global clock buffers DCM outputs PLL outputs Basic Architecture 30

31. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Spartan-6 FPGA I/O Clock Network Special clock network dedicated to I/O logical resources Independent of global clock resources Speeds up to 1 GHz Multiple sources for clocking I/O logic BUFIO2: for high-speed dedicated I/O clock signals BUFPLL: for clocks driven by the PLL in the CMT P N CMT PLL IO bank IOLOGIC P N BUFIO2 BUFIO2 BUFPLL BUFPLL P N P N IOLOGIC IOLOGIC IOLOGIC Basic Architecture 31

32. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Spartan-6 FPGA Clock Management Tile (CMT) dcm1_clkout<9:0> dcm2_clkout<9:0> 10 PLL pll_clkout<5:0> 6 CLKIN CLKFB CLKOUT<5:0> DCM 10 CLKIN CLKFB CLKIN CLKFB DCM Clocks from BUFG CLKOUT<9:0> CLKOUT<9:0> GCLK Inputs Feedback clocks from BUFIO2FB Basic Architecture 32

33. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Basic Architecture 33 Outline Overview Slice Resources I/O Resources Memory and DSP48 Clocking Resources Latest Families Virtex-6 Family Virtex-7 Family Summary

34. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Designers Eccentrics Higher System Performance More design margin to simplify designs Higher integrated functionality Lower System Cost Reduce BOM Implement design in a smaller device & lower speed-grade Lower Power Help meet power budgets Eliminate heat sinks & fans Prevent thermal runaway Basic Architecture 34

35. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Architecture Alignment Virtex-6 FPGAs Spartan-6 FPGAs 150K Logic Cell Device 760K Logic Cell Device Common Resources *Optimized for target application in each family 3.3 Volt compatible I/O Hardened Memory Controllers LUT-6 CLB DSP Slices BlockRAM HSS Transceivers* Parallel I/O FIFO Logic System Monitor Tri-mode EMAC PCIe Interface Enables IP Portability, Protects Design Investments High-performance Clocking Basic Architecture 35

36. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Virtex-6 and Spartan-6 FPGA Sub-Families Spartan-6 LX FPGA Spartan-6 LXT FPGA Virtex-6 LXT FPGA Virtex-6 SXT FPGA Virtex-6 HXT FPGA Lowest Cost Logic Lowest Cost Logic Low-Cost Serial Connectivity High Logic Density High-Speed Serial Connectivity High Logic Density High-Speed Serial Connectivity Enhanced DSP High Logic Density Ultra High-Speed Serial Connectivity Logic Block RAM DSP Parallel I/O Serial I/O Virtex-6 CXT FPGA Upto 3.75Gbps serial connectivity and corresponding logic performance Basic Architecture 36

37. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Basic Architecture 37 Outline Overview Slice Resources I/O Resources Memory and DSP48 Clocking Resources Latest Families Virtex-6 Family Virtex-7 Family Summary

38. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Virtex-6 Base Platform 38 Virtex Product & Process Evolution Delivering Balanced Performance, Power, and Cost Virtex Virtex-E Virtex-II Virtex-II Pro Virtex-4 Virtex-5 1st Generation 1st Generation 2nd Generation 2nd Generation 3rd Generation 3rd Generation 4th Generation 4th Generation 5th Generation 5th Generation 6th Generation 6th Generation 220-nm 180-nm 150-nm 40-nm 65-nm 90-nm 130-nm Virtex-6 Basic Architecture 38

39. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Static Power Reduction Higher distribution of low leakage transistors Dynamic Power Reduction Reduced capacitance through device shrink Reduced Core Voltage Devices Lower Overall Power VCCINT = 0.9V option allows power / performance tradeoff I/O Power Improvements Dynamic termination System Monitor Allows sophisticated monitoring of temperature and voltage Strong Focus on Power Reduction Up to 50% Power Reduction vs. Previous Generation Basic Architecture 39

40. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Virtex-6 Logic Fabric Virtex-6 Configurable Logic Block (CLB) Each CLB contains two slices Each slice contains four 6-input Lookup Tables (6LUT) Slices implement logic functions (slice_l) Slices for memories and shift registers (slice_m) LUT6 implements All functions of up to 6 variables Two functions of up to 5 or less variables each Shift registers up to 32 stages long Memories of 64 bits Multiple configurations within a slice Power Consumption Benefits Performance Benefits Cost Benefits Shift register mode greatly reduces power consumption over FF implementation Increased ratio of slice_m memories available closer to the source or target logic Can pack logic and memory functions more efficiently Basic Architecture 40

41. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Higher DSP Performance Most advanced DSP architecture New optional pre-adder for symmetric filters 25x18 multiplier High resolution filters Efficient floating point support ALU-like second stage enables mapping of advanced operations Programmable op-code SIMD support Addition / Subtraction / Logic functions Pattern detector Lowest power consumption Highest DSP slice capacity Up to 2K DSP Slices Basic Architecture 41

42. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Basic Architecture 42 Outline Overview Slice Resources I/O Resources Memory and DSP48 Clocking Resources Latest Families Virtex-6 Family Virtex-7 Family Summary

43. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Power, Performance and Productivity Drive Market Trends Lower Power Legislation and Regulations Higher Performance System Capacity and Performance Improved Productivity Reduce Capital and Operating Expenses (OPEX, CAPEX) Flat panel/TV, Central Office, Server Farms, Portable Medical, Portable Consumer Wired Infrastructure, Wireless, Broadcast, 300G+ Networks, Aerospace and Defense, High Performance Computing All Market Segments #1 Customer Problem: Lower Power enables better Cost, Performance, and Capability Basic Architecture 43

44. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only The Unified Architecture Advantage Common elements enable easy IP reuse for quick design portability across all 7 series families Design scalability from low-cost to high-performance Expanded eco-system support Quickest TTM Precise, Low Jitter Clocking MMCMs Logic Fabric LUT-6 CLB DSP Engines DSP48E1 Slices On-Chip Memory 36Kbit/18Kbit Block RAM Enhanced Connectivity PCIe Interface Blocks Hi-perf. Parallel I/O Connectivity SelectIO Technology Artix-7 FPGA Kintex-7 FPGA Virtex -7 FPGA Hi-performance Serial I//O Connectivity Transceiver Technology Basic Architecture 44

45. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only The Xilinx 7 Series FPGAs Industrys First Unified Architecture Industrys Lowest Power and First Unified Architecture Spanning Low-Cost to Ultra High-End applications Three new device families with breakthrough innovations in power efficiency, performance-capacity and price-performance Page 45 Basic Architecture 45

46. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Virtex-7 Sub-Families The Virtex-7 family has several sub-families Virtex-7: General logic Virtex-7XT: Rich DSP and block RAM Virtex-7HT: Highest serial bandwidth Virtex-7 XT FPGA Virtex-7 FPGA Virtex-7 HT FPGA High Logic Density High-Speed Serial Connectivity High Logic Density Ultra High-Speed Serial Connectivity High Logic Density High-Speed Serial Connectivity Enhanced DSP Logic Block RAM DSP Parallel I/O Serial I/O Basic Architecture 46

47. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Basic Architecture 47 Outline Overview Logic Resources I/O Resources Memory and DSP48 Clocking Resources Latest Families Virtex-6 Family Virtex-7 Family Summary

48. 2011 Xilinx, Inc. All Rights Reserved For Academic Use Only Summary The Spartan-6 FPGA slices contain four 6-input LUTs, eight registers, and carry logic LUTs can perform any combinatorial function of up to six inputs LUTs are connected with dedicated multiplexers and carry logic Some LUTs can be configured as shift registers or memories The Spartan-6 FPGA IOBs contain DDR registers as well as SERDES resources The SelectIO interfaces enable direct connection to multiple I/O standards The Spartan-6 FPGA includes dedicated block RAM and DSP slice resources The Spartan-6 FPGA includes dedicated DCMs, PLLs, and routing resources to improve your system clock performance and generation capability Latest introduced families are architected for power efficiencies Consists of Artix, Kintex, and Virtex devices Basic Architecture 48