Start on request mode, Disable on Silence mode | Atmel SpW-10X

	SpW-10X	Ref.:	UoD_SpW-10X_
	SpaceWire Router		UserManual
	SpaceWire Router	Issue:	3.4
	User Manual	Issue:	3.4
	User Manual	Date:	11th July 2008

8.2.1 Start on request mode

The Start on Request mode is enabled by setting the CFG_START_ON_REQ bit in the router control register. The input signal POR_START_ON_REQ_N determines the power on or reset state of the

CFG_START_ON_REQ bit.

When a SpaceWire packet is received which is to be routed out of a SpaceWire port that is not running it would normally be discarded. If the Start on Request mode is enabled instead of discarding the packet the SpaceWire port will attempt to make a connection with the other end of the link. If a connection can be made then the packet is forwarded on towards its destination. This is illustrated in Figure 8-4. This mode allows the SpaceWire ports to be started automatically when there is data to send. This can be used together with output deactivate to save power.

1
				1	R1	2			1	R2	2
				1	R1	2			1	R2	2
							Auto-Start default mode
							and Start on Request
							enabled in both routers
2
				1	R1	2			1	R2	2
		2	2
		2	2
	Packet with						Connection Attempt
	Packet with
	address 2
3
				1	R1	2			1	R2	2
								2
								2
							Link Started and
							Data Transfer

Figure 8-4 Start on Request mode

8.2.2 Disable on Silence mode

The Disable on Silence mode is enabled by setting the CFG_DISABLE_ON_SILENCE bit in the router control register. The input signal POR_DISABLE_ON_SILENCE_N determines the power on or reset state of the CFG_DISABLE_ON_SILENCE bit.

Figure 8-5 illustrates operation in the Disable on Silence mode.

Preliminary

85

Image 85

Atmel SpW-10X user manual Start on request mode, Disable on Silence mode, Cfgstartonreq bit

Contents

UoDSpW-10X Issue Date Th JulyUserManual Ref. UoDSpW-10X Date Issue Comments Author11th July SpW-10X Contents Control Logic and Operational Modes 103 Global Spacewire Link Control 136 128138 150 143151 15.16 List of Figures 100 List of Tables Able 9-7 E Xternal P ORT C ONTROL/S Tatus F Ields TERMS, Acronyms and Abbreviations Introduction Ref. UoDSpW-10X UserManual DocumentsDate 11th July Applicable Documents Document Number Document Title STAND-ALONE Router User Applications Embedded Router Node Interface Expanding the Number of Router Ports Issue Date 11th July Expanding the number of SpaceWire Ports SpW-10X Functional Overview External Ports Spacewire Ports Routing Table Configuration PortRouting Control Logic and Crossbar CONTROL/STATUS Registers TIME-CODE Processing PIN Locations Pin Signal Type Description VSSA2 GND PFOLVDS33Z EXTOUTDATA90 PO44F EXTOUTDATA108 PO44F EXTTIMEOUT6 PO44F Device Interface Global Signals SpW-10X SpaceWire Signals Spacewire SignalsTestIOEn TestEn DOUTPlus2 DOUTMinus1DOUTMinus2 DOUTPlus3 DINMinus1 11th July DINPlus1DINPlus2 DINMinus2 Lvds Receiver Fail-Safe Resistors SpaceWire Input Fail Safe Resistors SpW-10X UserManual Issue Date 11th July External Port Data SignalsExternal Port Interface Signals PinNo Dir Description Type EXT9INDATA5 Time-Code Signals PinNo Dir Description Type TIME-CODE SignalsSelexttime and the EXTTIMEIN70 EXTTIMEIN70 input Exttickin the value on EXTTIMEIN70 isExttickout is asserted Link error indication Signals PinNo Dir Description Type Status Interface SignalsPower on Configuration Normal Operation Configuration interface timing specification Reset Configuration Signals Feedbdiv at reset 11th July Reset Configuration Signals Dir DescriptionMaps to PORTXRATE20 Maps to Porstartonreqn General POWER, GROUND, PLL and Lvds SignalsDecoupling Lvds Reference PLL with external components External Port Interface Operation Interface Operations TIME-CODE Interface Operation External port read timing specification Time-Code Output Interface Status Interface Operation Status Output Bits Reset configuration interface timing specification Reset Configuration Interface Operation Packet Addresses Spacewire Router Packet Types Packet Header Deletion Packet PriorityPacket Priority Mapping Packet Address Physical Port type Invalid Addresses Supported Commands Command PacketsData Packets Read Command Read Single Address Command Format Issue Date Th July Read Single Address Characteristics SpW-10X EOP Read Incrementing Command Issue Date Th July Read Incrementing Address Characteristics Data Length MS 11th July 00h 11 Read-Modify-Write Command Characteristics Read Modify Write Command Preliminary66 RMW Read-Modify-Write example operation FEh 00h 14 Write Command Characteristics Write Command FEh 01h CRC MSB Status Command Error ResponseCode SpW-10X Local Source Path Address Command Packet Cyclic Redundancy Check Source Path Address Field Date 11 th July Command Packet Fill Bytes Default operating mode Spacewire Link ControlControl Logic and Operational Modes Auto-Start Automatic deactivate driver mode Link-Disable Deactivate driver operating mode Txrate +1 Setting the SpaceWire port transmit data rate TX 10MbitDIV +1 Setting SpaceWire Transmit Data Rate Global Spacewire Link Control Disable on Silence mode Start on request modeCfgstartonreq bit Control Logic and Routing Packet address errorArbitration Arbitration of packets with matching priority Arbitration of three packets with matching priority Arbitration of packets with different priority SpW-10X SpW-10X 10 Normal group adaptive routing Group Adaptive Routing Loop-back with Self-Addressing 11 Group adaptive routing when other ports busy 13 Packet Self-Addressing mode Blocked destination Packet Blocking 14 Destination Node Blocked a Blocking Allowed Mode 16 Destination Node Blocked c Watchdog timer mode Blocking Allowed 19 Destination Node Blocked Watchdog Mode c 21 Source Node Stalled a 100 101 102 Internal Memory MAP Register Definitions Register Addresses Summary Group Adaptive Routing Table Registers 11th July Configuration Register Addresses 106 Bits Name Reset Description Read/Write Value Issue Date Th July GAR Table Register Description Port CONTROL/STATUS Registers Configuration Port Control/Status Register FieldsGeneric port control/status register fields 11th July Bits Name Reset Description Read/Write Value Configuration port control/status register fields 110 111 SpaceWire Port Control/Status Register Fields SpaceWire port control/status register bits 113 114 Router CONTROL/STATUS Registers External port control/status register bitsNetwork Discovery Register Router Identity Register Router Control Register Fields Router Control Register 118 119 Error Active Register Fields Error active Register Time-Code Register Fields Time-Code Register Device Manufacturer and Chip ID Register General Purpose Register Time-Code Enable Register Transmit Clock Control Register 125 126 Unused Registers and Register Bits Destination Key RegisterEmpty packets Writing to a READ-ONLY Register Clock and Reset Timing Parameters Switching CharacteristicsSerial Signals Timing Parameters External port input Fifo timing parameters External Port Timing Parameters TIME-CODE Interface Timing Parameters Time-code Timectrrst interface ERROR/STATUS Interface Timing Parameters 132 Latency and Jitter Switching LatencyClock Periods Router Latency SpaceWire port to External port Issue Date Th July SpaceWire port to SpaceWire portExternal port to SpaceWire port Time-code Latency 10.6.6 200M bits/s Input and Output Bit Rate Example Time-code Jitter DC Characteristics Electrical CharacteristicsOperating Conditions Symbol Description Value Units Absolute Maximum Ratings Absolute Maximum Ratings Symbol Description Value UnitsReliability Information Reliabilty Information Application Guidelines Example Circuit Diagram 139 PCB Design and Layout Guidelines External Ports Status / Power On Configuration InterfaceTime-code Interface PLL Layout Recommendations 12.2.10 PLL Anomalies Anomalies and Warnings 144 Data Strobe Reset Waveform Reset Anomaly 146 Reset Anomaly Workarounds Data Strobe Disable Waveform Parity Error Action Parity Error AnomalyParity Error Anomaly No error end of packet inserted after parity error Parity Error Workaround Technical Support Issue 3.2 to Issue Issue 3.3 to IssueIssue 3.1 to Issue Document Changes Issue 2.5 to Issue Issue 3.0 to Issue Issue 2.3 to Issue Issue 2.4 to IssueIssue 2.2 to Issue Issue 2.0 to Issue Issue 2.1 to IssueIssue 1.7 to Issue Issue 1.6 to Issue Issue 1.0 to Issue Issue 1.1 to Issue