. SSC050 i 2 c backplane controller product brief overview the SSC050 i 2 c backplane controller is a cmos integrated circuit, which enables a system designer to reduce system cost by integrating all of the digital logic typically required in a storage enclosure. the SSC050 may be used in any embedded control application including parallel scsi, fibre channel or any other application where the monitoring and control of a large number of digital i/o signals is required. programming the SSC050 is easy through a convenient programming model, which reduces the overall duration of the design-in cycle. data is read and written to the device over an addressable (3-bit) i 2 c serial interface, allowing multiple SSC050 devices on a single two-wire bus. device features i 2 c serial interface (dc to 400khz) 4 fan speed monitor inputs 40 programmable, bi-directional i/o pins flexible fc-al port bypass control logic bit programmable interrupt control seven led flash rates 64 pqfp package i 2 c serial interface the SSC050 uses an i 2 c serial interface to communicate with embedded controllers such as vitesse?s ssc100/200 and vsc205/210. the slave interface on the SSC050 uses a three-bit (a2 :0) addressing scheme for identification on the serial interface. the asel pin determines the four-bit device type identifier. up to sixteen, SSC050 or vcs055 devices may reside on a single i 2 c serial interface. i/o pins the SSC050 has forty bi-directional i/o pins. the functionality of these pins is configurable via programming of the SSC050. all i/o pins have a 12ma drive strength and support 3.3v ttl. to enable the designer to configure and program the SSC050, the forty i/os are arranged in registers of eight pins. certain groups of pins have additional functionality beyond simple input or output to support the integrated fan speed sensors and fc-al port bypass control. drive bay 1 drive bay 2 drive bay 3 drive bay 4 vsc7122 vitesse backplane controller (vsc050) local i/o (x8) vitesse embedded controller (ssc100) temperature sensor (lm75) flash (64k x 8) i 2 c serial interface pbc_en1 pbc_en2 pbc_en3 pbc_en4 power supplies leds (x8) pbc_en fans (x4) vsc7120 cu or optics x24c16 eeprom vsc7120 pbc_en application for a single loop, single controller with four drives
. led flash rate control the built-in flexibility of the SSC050 allows all forty of the i/o pins to drive leds through a pull-up resistor. each pin is independently programmed to flash an led at one of seven predefined flash rates. fan speed sensors the SSC050 includes four pins (p2.4 to p2.7), which may be configured as fan speed sensors. this feature enables the designer to provide high value monitoring features at significantly reduced costs. embedded controllers may access the SSC050 to determine the rotational speed (rpm) of fans attached to each of the four inputs. the SSC050 may also be programmed to signal an interrupt if any one of the speed sensors fall below the designer?s predefined level. fc-al port bypass control up to sixteen of the forty i/os may be configured to monitor and manage fc-al port bypass control devices. eight pairs of i/os include special logic to monitor enable bypass signals, which may be generated by fc-al disk drives, and control port bypass control enable ( pbc_enx) signals on port bypass devices such as vitesse?s vsc7122. the unique functionality of the SSC050 provides the system designer with additional flexibility and control over the port bypass function in a fc-al enclosure. this allows system designers to differentiate and add value by controlling when and how a drive is removed or inserted into a fc-al enclosure. this feature may also be used for non-fc-al applications. it is useful wherever system designers require flexible monitoring and control of backplane signals. interrupt support there are up to forty interrupt sources within the SSC050. i/o pin signal transitions, fan speed sensor threshold levels and transitions on port bypass inputs may be configured to generate interrupts. advanced interrupt priority and management logic provides the system designer with maximum flexibility and a simple and convenient programming method for handling interrupts. related documents vsc050 data manual ssc100/200/vsc205/210 data manual any sdk specification for more information : www.vitesse.com email: prodinfo@vitesse.com tel: 1-800- vitesse fax: 805/987-5896 vitesse semiconductor corporation reserves the right to make changes in its products, specifications or other information at any time without prior notice. therefore the reader is cautioned to confirm that this datasheet is current prior to placing any orders. the company assumes no responsibility for any circuitry described other than circuitry entirely embodied in a vitesse product. (version 1.0) ? 2000 vitesse semiconductor corporation, all rights reserved. p0.0 - p0.7 p1.0 - p1.7 p2.0 - p2.7 p3.0 - p3.7 i/o control and led flash fan speed sensors port bypass control p4.0 - p4.7 interrupt priority and control two-wire slave i/f power on reset clock int# a2-a0 asel scl sda osci osco i/o ports SSC050 block diagram
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