PDF SY10 Data sheet ( Hoja de datos )

Número de pieza	SY10
Descripción	SYNCHRONOUS EQUIPMENT STRATUM 3/3E CLOCK UNIT
Fabricantes	Raltron Electronics
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No Preview Available ! SY10 • FEATURES SYNCHRONOUS EQUIPMENT STRATUM 3/3E CLOCK UNIT – SY10 Date: August 30, 2002 • INTRODUCTION The SY10 - an accurate time and frequency source that had been designed as a subsystem level module. The module is designed to work within ATM, SONET, SDH, and wireless systems where synchronization is vital. The SY10 is an excellent synchronization solution for timing, with jitter and wander compliance per the specified within ITU-T Recommendations G.812/G.813 and Bellcore GR- 1244-CORE. The SY10 is an enhanced version of SY01 and is designed for Stratum 3 and Stratum 3E, but also holds certain features that can make it useful for SONET Minimum Clock (SMC) or other kinds of system clocks. v A synchronization solution for timing, jitter and wander concerns in a single module. v Complies with ITU-T Recommendations G.812/813 and Bellcore GR-1244-CORE for Stratum 3 and Stratum 3E applications. v Supports modes of operation: Locked, Holdover and Free-run. v Accepts reference inputs from up to six independent sources from 8KHz to 77.76MHz v Provides up to 3 output from 8KHz to 77.76MHz (Two user select and one fixed at 8KHz) v Loop filtering utilizing specific software application in the digital signal processor (DSP). v Continuously monitors and evaluate input reference signals. v Phase build-out for output clock. v Creates a history buffer for Holdover mode operation. v Alarm and status signals and messages. v Host interface SPI for configuring and remote monitoring. v Supports Master/Slave configuration of two SY10 with minimum phase error between two clocks. v Provides “hit-less” switching during switching between the clocks. v Pin compatible with 18 pins SY01 module. v Small dimensions of 1.82 x 1.82 x 0.7 inch. (0.60 inch with no mechanical cover) • APPLICATION The SY10, a Synchronous Equipment Clock (SEC), fulfills clock regeneration function for STRATUM 3 and 3E equipment for: ATM, SDH, PDH, and SONET networks. It was designed for network system manufacturers such as: Access Switches, Core Switches, Cross Connects, Digital Multiplexers-Exchangers, and SDH/SONET equipment. The unit is also suitable for PCS, WLL, and Wireless Base Stations. Wherever a Timing unit with high performance specifications is required, the SY10 can be embedded within the network system and provide all necessary frequencies and interfaces. RALTRON ELECTRONICS CORP. § 10651 N.W.19th St § Florida 33172 § U.S.A. Tel: 305 593-6033 § Fax: 305-594-3973 § e-mail: [email protected] § Internet: http://www.raltron.com 1 1 page SYNCHRONOUS EQUIPMENT STRATUM 3/3E CLOCK UNIT – SY10 Control Several controls pins are available for the user to control the operation of the SY10 Primary PLL. The three external inputs CNT1, CNT2 and CNT3 provide the feature to change the state of operation. Below, the truth table shows behavior of the SY10 module according to the control inputs states. CNT3 0 0 0 0 1 1 1 1 CNT2 0 0 1 1 0 0 1 1 CNT1 0 1 0 1 0 1 0 1 MODE OF OPERATION Free-run Locked to REF1 Locked to REF2 Holdover Locked to REF3 Locked to REF4 Locked to REF5 Locked to REF6 To change the operation of Secondary PLL (Master-Slave) can be change using MS/FR control pin. MS/FR† MODE OF OPERATION 1 (or open) Master (default) 0 Slave †see explanation about MS/FR below. The state of operation can be set and changed also using serial communication port, please see below. The SY10 State Machine – Primary PLL The state machine of SY10 module can be controlled using one of two interfaces: 1) three external control pins CNT1, CNT2 and CNT3. 2) setting bits (CON0, CON1, CON2 and CON3) in CFG1 register using serial peripheral interface (SPI). After the reset the module is set to use three external control pins for control function but user can change it by setting bit UI in register CFG1. By setting the UI bit to 1 the module ignores states of the control pins and use bits in CFG1 register for state engine control. On the figure below is shown simplified stated diagram of SY10 module. 1 FREE RUN 2 4 3 5 REFERENCE SWITCHING 7 6 14 8 9 11 FREQ. and PHASE LOCKING 10 HOLDOVER 12 13 Figure 2 – The SY10 state diagram – Primary PLL. RALTRON ELECTRONICS CORP. § 10651 N.W.19th St § Florida 33172 § U.S.A. Tel: 305 593-6033 § Fax: 305-594-3973 § e-mail: [email protected] § Internet: http://www.raltron.com 5 5 Page SYNCHRONOUS EQUIPMENT STRATUM 3/3E CLOCK UNIT – SY10 7(MSB) D7 654321 D6 D5 D4 D3 D2 D1 0(LSB) D0 - D7-D0 – Content to be read from the module addressed by A5:A0 SPI Flowchart Entry point No of received bytes > 0? YES NO NO Received Address Valid? YES SPIStatus = ADDRESSERROR YES No of received bytes = 1? NO WRITE Command Read or Write? READ Fetch data from MMR to send out NO No of received bytes = 2? YES READ Command Read or Write? WRITE SPIStatus = OK SPIStatus = OVERFLOW Wait for the next byte Reset all NO SPIStatus = WRITEERROR Valid Data to write in MMR? YES Write Data in MMR SPIStatus = OK Figure 10. - The SPI flowchart. Timing diagrams RALTRON ELECTRONICS CORP. § 10651 N.W.19th St § Florida 33172 § U.S.A. Tel: 305 593-6033 § Fax: 305-594-3973 § e-mail: [email protected] § Internet: http://www.raltron.com 11 11 Page

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