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Siemens SPC3 Timing Characteristics, SYS Bus Interface, Clock pulse 48 Mhz, Clock Pulse Timing

Models: SPC3

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PROFIBUS Interface Center	SPC3

8.5 Timing Characteristics

The following is generally applicable: All signals beginning with ‘X’ are ‘low active’. All signal runtimes are based on the capacitive loads specified in the table above.

8.5.1 SYS Bus Interface

Clock Pulse:

No.	Parameter	MIN	MAX	Unit


	Clock pulse 48 Mhz :
1	Clock High Time	6.25	14.6	ns
2	Clock Low Time	6.25	14.6	ns
3	Rise Time		4	ns
4	Fall Time		4	ns

Clock Pulse Timing:

	TCLH
	1
CLK	2,4V
	0,6V
	3

TCLL

2

4

Distortions in the clock pulse signal are permitted up to a ratio of 40:60. At a threshold of 1.5 or 3.5 V:

Interrupts:

No.	Parameter	MIN	MAX	Unit


1	Interrupt Inactive Time (for EOI_Timebase = 0)	1	1	μs

	Interrupt Inactive Time	1	1	ms

X/INT

EOI

1

After acknowledging an interrupt with EO1, a min. of 1 us or 1 ms is expected in SPC3 before a new interrupt is output.

Page 46	V1.3	SPC3 Hardware Description
2003/04		Copyright (C) Siemens AG 2003. All rights reserved.

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Siemens SPC3 manual Timing Characteristics, SYS Bus Interface, Clock pulse 48 Mhz, Clock Pulse Timing, Interrupts

Contents

Simatic NET Page SIM Atic NET Profibus Interface Center SPC3 Hardware DescriptionVersions Release Date ChangesMode Register Status Register Interrupt Controller Watchdog TimerDPBuffer Structure Description of the DP Services Directory11.3 Diagnostics Processing from the System View Asic TestPin Assignment Example for the RS 485 Interface SPC3 Introduction Function Overview Pin Description CmosCPD Cmos with pull down TTLt Schmitt trigger V1.3 Memory Allocation Memory Area Distribution in the SPC35FFH Segment Processor Parameters Latches/Register Significance Write Access OCH 0DH0EH 0FH Organizational Parameters RAM 1AH 1BH1CH 1DHMode Register Asic InterfaceDisstartcontrol Mode Register 1 Mode-REG1, writable STARTSPC3Exiting the Offline state EOIStatus Register Fdlindst Status Register Bit15 . .readableInterrupt Controller SPC3 IRR IMRDxout IMR IARWatchdog Timer Automatic Baud Rate IdentificationBaud Rate Monitoring Response Time MonitoringPROFIBUS-DP Interface DPBuffer StructureUart RAM Aux-Buffer ManagementDescription of the DP Services SetSlaveAddress SAP55Sequence for the SetSlaveAddress Utility SetParam SAP61 Parameter Data StructureParameter Data Processing Sequence CheckConfig SAP62 SPC3Diagnostics Processing Sequence SlaveDiagnosis SAP60SPC3 Structure of the Diagnostics Buffer WriteReadData / DataExchange DefaultSAPWriting Outputs Profibus Interface Center Reading InputsUserWatchdogTimer GlobalControl SAP58GetConfig SAP59 ReadInputs SAP56ReadOutputs SAP57 Hardware Interface Universal Processor Bus InterfaceGeneral Description Bus Interface Unit BIUXINT/MO Mode Bus Interface V1.3Switching Diagram Principles Low Cost System with 80C32System X86-Mode SPC3 Application with the 80 CApplication with th 80 C Interface Signals UartAsic Test Technical Data Maximum Limit ValuesPermitted Operating Values DC-Specifikation of the I/O- DriversAC-Specification for the Output Drivers Tabel 8.3 DC-Specifikation of the I/O- DriversCurrent Tabelle 8.5 Leakage current of the output drivers Timing Characteristics SYS Bus InterfaceClock pulse 48 Mhz Clock Pulse TimingReset Timing in the Synchronous C32-ModeST-Vers Min Max Unit TBDSynchronous Intel-Mode, Processor-Read-Timing Synchronous Intel-Mode, Processor-Write-TimingTiming in the Asynchronous Intel Mode X86 Mode ST-VersParameter Min Max Asynchronous Intel-Mode, Processor-Read-Timing XRD XCS XreadyAsynchronous Intel-Mode, Processor-Write-Timing XWR XCS4.1 74.2 Synchronous Motorola-Mode, Processor-Read-TimingSynchronous Motorola-Mode, Processor-Write-Timing Timing in the Asynchronous Motorola-Mode for example, 68HC16Asynchronous Motorola-Mode, Processor-Read-Timing XCS XdsackAsynchronous Motorola-Mode, Processor-Write-Timing Serial Bus Interface Pulse 48 MHzHousing PQFP-44 Housing SPC3 Hardware Description Symbol Min Typ Max AMI-Vers 13.6513.90 14.15Profibus Interface Pin AssignmentRTS TXDExample for the RS 485 Interface SN65ALS1176Appendix AddressesProfibus User Organisation Technical contact person at ComDeC in GermanyGeneral Definition of Terms Ordering of ASICs10.3.1 SPC3 AMI 10.3.2 SPC3 STAppendix a Diagnostics Processing in Profibus DP Diagnostics Bits and Expanded DiagnosticsIntroduction StatdiagIdentifier Byte 7 has Etc Identifier Byte 0 has Diagnostics Processing from the System View Single DiagnosticsSimatic S5 / COM ET CombiAppendix B Useful Information Data format in the Siemens PLC SimaticPage Siemens Aktiengesellschaft