soc ip core based for spacecraft application

SoC IP core based for spacecraft
applications

 INTRODUCTION
 WHY SYSTEM ON CHIP FOR SPACECRAFT
APPLICATIONS?
 SOC COMPONENTS
 DESIGN METHODOLOGY
 DESIGN ARCHITCTURE
 DESIGN OF ARM PROCESSOR
 CCSDS TELECOMMAND DECODER
 RESULTS AND DISCUSSIONS
2

 A system on a chip or system on chip (SoC or SOC) is an
Integrated Circuit (IC) that integrates all components of a
computer or other electronic system into a single chip.
 SoC is a collection of all components and subcomponents of a
system on to a single chip.
 System development based on the use of a core-based
architecture, where the reusable cores are interconnected by
means of a standard on-chip bus, which is the most common
way to integrate the cores into the SoC.
3

 In system-on-chip design, predesigned blocks called
Intellectual Property(IP) blocks, IP cores or virtual
components are obtained from internal sources or third parties
and combined into a single chip.
 The primary drivers for this SoC were the reduction of power,
smaller form factor and the lower overall cost.
 It is important to recognize that integrating more and more
functionality on a chip has always existed as a trend by virtue
of Moore' s Law.
4

5
 Less volume and mass – better
satellite bus-to-payload volume and
mass ratio
 Higher reliability - fewer
interconnects, solder joints, bond
wires, handling
 Easier to assemble and to shield
against radiation
 Easier to test using on-chip
techniques Figure : Eniac 1946 Performance 300
IPS

 The LEON2 core is a SPARC V8 compatible processor
developed for future space missions based on the AMBA AHB
and APB on-chip buses.
 It has been implemented as a highly configurable, synthesizable
VHDL model, which exists in two versions.
 A Single-Event-Upset (SEU) fault-tolerant version, called
LEON2-FT, involving complete TMR protection for all flip-
flops and EDAC protection for all memories is the base of the
AT697 microprocessor, on radiation hard 0.18 um technology.
 A non fault-tolerant version is freely available under the GLU
Lesser General Public License.
6

7
 Microprocessor IP Core
 Memory Error Detection and Correction Unit
 Bootstrap Loader
 HDLC Controller
 CAN Interface
 Network Interface
 True IDE Interface
 Cordic Co-Processor
 Peripheral Bus Interface

8
Figure 3: Block diagram of SoC design
 An On-Board System (OBS) of a small Satellite is implemented in
the form of a telecommand System-on-a-Chip (SoC).
 Soft intellectual property (IP) cores written in the hardware
description language VHDL are used to build the system on-a-
chip.

 The resulting subsystem is the integration of SRAM,
PROCESSOR and EDAC Unit was designed.
 The telecommand input data is send from ground station to
the space station it is given as input to the SRAM.
 In space applications it is well known that in Low Earth Orbit
(LEO) stored digital data suffers from SEUs.
 For the secure transaction of data between the CPU of the on
board computer and its local RAM the error detection and
correction unit so that the errors can be detected and corrected
and the resultant output will be a error free data.
9
Contd…

 Every technological improvements in the integrated circuit
industry is followed by the development of new design
technology.
(i)Area-Driven Design
(ii)Timing –Driven Design
(iii)Block-Based Design
(iv)IP- Core Based Design
(v) Platform –Based Design
10
Contd…

 The resulting subsystem is the integration of SRAM, ARM
PROCESSOR, EDAC Unit and CCSDS Decoder was
designed.
11
Figure: Block diagram of SoC design

 The telecommand input data is send from ground station to the
space station it is given as input to the SRAM.
 Bit-flips caused by SEUs are a well-known problem in
memory chips and error detection and correction techniques
have been an effective solution to this problem.
 The resultant error free data is fed to the processor, so that it
will process the error free data and also it will collect all the
on –board data signals and produce the resultant data output.
12
Contd…

 Static random-access memory (SRAM) is a type of
semiconductor memory that uses bistable latching circuitry to
store each bit.
 The Dynamic RAM memory can be deleted and refreshed
while running the program ,whereas Static RAM is not
possible to refresh the programs
 SRAM memory arrays are arranged in rows and columns of
memory cells called wordlines and bitlines, respectively. Each
memory cell has a unique location or address defined by the
intersection of a row and column, which is linked to a
particular data input/output pin.
13

 The total size of the memory, the speed at which the memory
must operate, layout and testing requirements and the number
of data inputs and outputs on the chip determines the number
of arrays on a memory chip.
 The size of an SRAM with m address lines and n data lines is
2^m words or 2^m x n bits.
14
Contd…

15
Figure: Block diagram of 2K x32 bit SRAM
Contd…

 Error Correction Codes (ECC) and Error Detection And
Correction (EDAC) schemes have been implemented in
memory designs to tolerate faults and enhance reliability.
 The modified Hamming Code and Hsiao Code are the most
widely used Single-Error Correctable and Double-Error
Detectable (SEC-DED) codes.
16
Figure : ECC Code word format

 In space applications it is well known that in Low Earth Orbit
(LEO) stored digital data suffers from SEU' s caused by
radiations.
 The radiations may be Ultraviolet Radiation, Infrared
Radiation and Gamma Radiation.
 The change in data caused by SEUs are a well-known problem
in Memory Chip and Error Detection And Correction
Techniques have been an effective solution to this problem.
17

18
Figure : Integration of SRAM with EDAC unit
Contd….
In order to have the secure transmission of data between a
central processing unit (CPU) and its local Random Access
Memory (RAM) the traditional means of Error Detection And
Correction (EDAC) is a Hamming code.

 The Parity Generator generates the parity from the input data
word.
 The entire codeword, which includes the data word and parity
word is written into the memory when we perform the WRITE
operation.
 In a READ operation, the data word to be read is used to
generate the parity again.
 The Syndrome Generator compares the newly generated parity
with the read-out parity to produce the syndrome that contains
the information for error bits.
23
Contd….

 The high capacity, low cost FPGA devices train continues its
revolutionary journey through the electronics design.
 Soft core processors are processors that are defined as part of
the FPGA design that is programmed into the physical FPGA
device.
 This processors are typically 32-bit and have simple, RISC
architectures. The ARM (Advanced RISC Machine) processor
uses load-store architecture.
 The data register file consists of 32 registers, where of 16 are
accessible at one time (depending on the current operating
mode).
20

 The operand unit performs the operand fetch for the three
operand-slots. Also the data conflict detector and the
forwarding system are placed here.
 The Barrel Shifter unit performs the Arm-compatible barrel-
shifting of the data in ALU data path B.
 The shift value can either be an immediate from the opcode or
a register value which is loaded in the same cycle, no
additional data load cycle is needed.
 The sign extend hardware converts signed 8-bit and 16-bit
numbers to 32-bit values as they are read from memory and
placed in a register.
21
Contd…

 ARM instructions typically have two source registers, Rn and
Rm, and a single result or destination register, Rd Source
operands are read from the register file using the internal buses
A and B.
 The ALU (Arithmetic Logic Unit) or MAC (Multiply-
Accumulate Unit) takes the register values Rn and Rm from
the A and B buses and computes a result.
 Data processing instructions write the result in Rd directly to
the register file. Load and store instructions use the ALU to
generate an address to be held in the address register and
broadcast on the Address bus.

22
Figure : ARM core architecture flow
Contd..
Address

 A telecommand system must reliably and transperantly convey
control information from an the originating source to a remotely
located physical device or process.
 The Telecommand Channel enables an secure data path to be
established for the transfer of telecommand to the spacecraft. The
service contains two distinct layers of data handling operations.
(i) CODING LAYER
(ii) PHYSICAL LAYER
23

LOGIC
UTILIZATIO
N
AVAILABLE USED UTILIZATIO
N
(%)
Number of
Slice
Registers
301440 2232 1%
Number of
Slice LUT’S
150720 3962 2%
Number of
fully used
LUT-FF
pairs
4838 1356 28%
Number of
Bonded
IOB’S
600 318 53%
Number of
Block
RAM/FIFO
416 6 1%
24
Table : Xilinx device utilization summaries

 Decreased power consumption
 Increased reliability
 Smaller board space
 Can be cheaper when using ready to go components
25

 Extremely high design cost (for the actual chip)
 Large silicon space may be required
 Component testing may be difficult
 Prototyping may take longer
 Intellectual property (IP) issues
26

The primary focus in SoC verification is on checking the
integration between the various components. Rather than
implementing each of these components separately.
 The role of the SoC designer is to integrate them onto a chip to
implement complex functions in a relatively short time.
Designer can concentrate on the complete system without having to
worry about the correctness or performance of the individual
components.
 The conventional telecommand system is designed with
SRAM,EDAC unit and Processor and they are integrated to form a
SoC design.

soc ip core based for spacecraft application

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soc ip core based for spacecraft application