GRSPW资料
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Copyright Aeroflex Gaisler ABDecember 2008, Version 1.0.2SpaceWire CODEC with RMAP
GRSPW / GRSPW-FT
CompanionCore Data Sheet
GAISLER
Features
•Full implementation of SpaceWire standardECSS-E-ST-50-12C
•Protocol ID extension ECSS-E-ST-50-11C
•RMAP protocol ECSS-E-ST-50-11C
•AMBA AHB back-end with DMA
•Descriptor-based autonomous multi-packettransfer
•SEU protection and fault-tolerance
•Low area and high transfer frequency
•100 Mbit/s data transfer on Actel RTAX
•Support for Fusion, IGLOO, RT-ProASIC3/E,Axcelerator and RTAX-S Product FamiliesDescription
The GRSPW core implements a SpaceWireCodec with RMAP support and AMBATM hostinterface. The core implements the SpaceWirestandard with the protocol identificationextension and RMAP protocol draft. Receive andtransmit data is autonomously transferredbetween the SpaceWire Codec and the AMBAAHB bus using DMA transfers.
Through the use of receive and transmitdescriptors, multiple SpaceWire packets can bereceived and transmitted without processorinvolvement. The GRSPW control registers areaccessed through an APB interface.
Applications
The fault tolerant design of the SpaceWire core incombination with the radiation tolerant ActelFPGA gives total immunity to radiation effectsand makes it well suited for space applications.Transmitter
ReceiverD
S
SD
RxClockRecoveryTxClk
RxClockAHB MasterInterfaceTransmitterFIFO
N-CharFIFOLinkInterfaceFSMAHB clock domain
Tx clock domain
Rx clock domain
Data ParallelizationReceiver AHB FIFOTransmitterDMA Engine
RegistersAPBInterfaceReceiverDMA EngineSendFSM
RMAPReceiverRMAPTransmitter元器件交易网www.cecb2b.com2GRSPW / GRSPW-FT
Copyright Aeroflex Gaisler ABDecember 2008, Version 1.0.2
GAISLER
1Introduction
1.1Overview
The GRSPW core implements a SpaceWire Codec with RMAP support and AMBA host interface.The core implements the ECSS SpaceWire standard with the protocol identification extension andRemote Memory Access Protocol (RMAP).
Receive and transmit data is autonomously transferred between the SpaceWire Codec and the AMBAAHB bus using DMA transfers. Through the use of receive and transmit descriptors, multipleSpaceWire packets can be received and transmitted without CPU involvement. The GRSPW control
registers are accessed through an APB interface.
1.2Example application
The GRSPW core has been designed to fit into an architecture from which a large variety of applica-
tions can be derived. The architecture is centered around the AMBA Advanced High-speed Bus(AHB), to which the GRSPW core and other high-bandwidth units are connected. Low-bandwidthunits connected to the AMBA Advanced Peripheral Bus (APB) which is accessed through an AHB to
APB bridge. The architecture is shown in figure 2.
Figure 1. GRSPW block diagramAMBA AHBGRSPW
SpaceWire
APB slaveAHB masterSpaceWire signals
AMBA APBRMAP CtrlCodec
Registers
Figure 2. Architectural block diagram of a typical system using the SpaceWire codecLEON3FT32-bit SPARCInteger Unit
I-cacheDebugSupportUnitD-cache
CAN2.0ControllerMemoryControllerwith EDACSDRAMControllerwith EDACSpaceWireCodecInterfaceMil-Std-1553BC/RT/MTInterface2 x UART16 x GPIO
Mil-Std-1553RTInterface32-bit AMBA AHBTimersInterrupt
AHB/APBUARTDebugLinkJTAGDebugLinkOn-ChipMemorywith EDACFPU
PROM/SRAMSDRAMLVDS I/F3232
CAN-2.0Dual-1553Dual-1553AHBCTRL元器件交易网www.cecb2b.com3GRSPW / GRSPW-FT
Copyright Aeroflex Gaisler ABDecember 2008, Version 1.0.2
GAISLER
1.3Signal overview
The GRSPW signals are shown in figure 3. Note that the AMBA AHB and APB signals are imple-mented VHDL records and are not shown in detail.
1.4Implementation characteristics
The GRSPW is inherently portable and can be implemented on most FPGA and ASIC technologies.Table 1 shows the approximate cell count and frequency for four different GRSPW configurations onActel RTAX.
The GRSPW core is available in VHDL source code or as a pre-synthesized netlist. It can be deliveredfor stand-alone operation or with a wrapper for GRLIB AMBA plug&play interface.Table 1.Implementation characteristics (Cells (comb. / seq.) / RAM blocks / AHB MHz / SPW MHz)Core configurationRTAX2000S-1ASIC
GRSPW3,100 (2,100 / 1,000) / 3 / 40 / 10010,000 gates
GRSPW + RMAP4,700 (3,450 / 1,250) / 4 / 40 / 10015,000 gates
GRSPW-FT3,100 (2,100 / 1,000) / 5 / 40 / 10011,000 gates
GRSPW-FT + RMAP4,800 (3,550 / 1,250) / 6 / 40 / 10016,000 gatesFigure 3. Signal overviewclkrsttxclk
swni.dswni.sswni.tickinswni.clkdiv10swno.dswno.sswno.tickoutSpaceWire LinkClock & Reset
swni.timerrstvalswni.dcrstval
swni.rmapen
ahbmoahbmiapboapbiAMBAConfiguration元器件交易网www.cecb2b.com
