VMIVME-2540 24-Channel Intelligent Counter/Controller • Event counting - up to 4 giga events -3 • Frequency measurement —1.16 x 10 Hz to 2.5 MHz 6 • Period/pulse-width measurement—400 ns to 8.5899 x 10 s (32-bit floating point), 400 ns to 858 s (32-bit unsigned integer) • Square wave/pulse train generation - 0.0076 Hz to 2.5 MHz • Timer/periodic VMEbus interrupter - 0.0076 to 1,000 Hz • Quadrature position measurement - sin/cos up to 1 MHz, 32-bit counters, limit/modulo checking • Integer period/pulse-width measurement 16- and 32-bit, discrete or continuous; low data transport lags • Programmed output - up to 24 discrete outputs • Pulse sequence mode - train of N pulses with programmable duty cycle • Quadrature position control outputs - ±1/4 wave control resolution; up to 1.25 MHz step rate and ±32767 steps per command • Integer QPM group acquisition - captures two integer QPM measurements simultaneously • Event-triggered timer delay - generates VMEbus interrupt up to 131.1 seconds after event edge input; retriggerable • 24 control/measurement interfaces: 24 clocks, 24 gates, 24 outputs • RS-422 differential interface with support for single-ended TTL inputs • Options allow configurations of 4, 8, 16, and 24 interfaces • On-board 15 MHz 68HC000 CPU Once programmed by the VMEbus host, the • A32/A24/D32/D16/D8 (EO) VME slave interface, 64 Kbyte VMEbus VMIVME-2540 ICC performs these functions memory window automatically. The on-board CPU maintains data structures • Data exchange interface: ANSI/IEEE standard 754-1985 for 32-bit floating-point arithmetic in shared local memory for buffering measurements and • Continuous measurement modes queueing control commands. Measurement functions are • VMEbus compatible ANSI/IEEE 1014-1987 IEC 821 and 297 also supported by a Continuous Measurement Mode in which measurements are made repeatedly without host CPU APPLICATIONS involvement. I/O connections are routed through • Rotational shaft instrumentation: angular position, velocity, acceleration • Automotive industry testing: brakes, transmissions, tachometer high-density connectors located on the front panel with • Robotics support for differential and single-ended signal levels. The • Telescope/observatory user data exchange interface for measurement and • Medical/laboratory instruments • Linear position measurement: distance, velocity, acceleration generation modes complies with ANSI/IEEE Standard • Elevators 754-1985 for 32-bit floating-point arithmetic. Integer modes • Overhead cranes operate with two’s complement signed arithmetic and with • X-Y tables • Machine tools unsigned arithmetic. • Automatic storage retrieval TECHNICAL DESCRIPTION — The PRODUCT OVERVIEW — The VMIVME-2540 VMIVME-2540 ICC is comprised of three sections: the Intelligent Counter/Controller (ICC) is a VMEbus slave I/O VMEbus slave DTB interface which arbitrates for the local module designed to provide high-precision digital CPU resources, the CPU with firmware and support logic, measurement and function generation capability for and the circuitry which implements the measurement and VMEbus systems with a simple, consistent control functions. The block diagram of the VMIVME-2540 memory-mapped user interface. The following functions are ICC is shown in Figure 1. supported by the VMIVME-2540: Measurement Functions Event counting Ordering Options Frequency measurement January 24, 1999 800-002540-000 J ABC – D E F Period/pulse-width measurement VMIVME-2540 –00 – Quadrature position measurement A = Interface Options 0 = 4 Channels 1 = 8 Channels Generation Functions 2 = 16 Channels Pulse train/square wave generation 3 = 24 Channels BC = 00 (Options reserved for future use) Timer/periodic interrupt generation For Ordering Information, Call: Frequency division 1-800-322-3616 or 1-256-880-0444 • FAX (256) 882-0859 Quadrature position control E-mail: info@vmic.com Web Address: www.vmic.com Copyright © March 1992 by VMIC Specifications subject to change without notice. VMIC • 12090 South Memorial Parkway • Huntsville, Alabama 35803-3308 1 VMIVME-2540 The ICC counter circuitry consists of six FUNCTIONAL SPECIFICATIONS programmable System Timing Controllers (STCs). Each System Time Base: 5 MHz STC provides the ICC with four high-speed counter/waveform synthesis interfaces, giving the Accuracy/Stability: ±0.005 percent VMIVME-2540 twenty-four channels of digital EVENT COUNTING measurement and control. The STC counters may be configured individually or in groups of up to four to Input Frequency Range: Up to 2.5 MHz implement the various measurement and control functions. 16 Count Range Returned: Up to 2 (word mode) The on-board 68HC000 CPU configures and manages each 32 Up to 2 (long mode) STC interface directly, allowing the VMEbus host interface to be elevated above the hardware level. Ordering options PERIOD/PULSE-WIDTH MEASUREMENT allow the VMIVME-2540 to be factory configured with 1, 2, 4, or 6 System Timing Controllers. The inputs and Input Period Range/Accuracy outputs of the System Timing Controllers are buffered at the 16-bit Counter: 131.07 s to 400 ns front panel connectors with RS-422 line receivers and line drivers. TTL input signal compatibility is supported by 131 s to 13.1 ms Accuracy: 0.015 percent connecting the inverting input of the RS-422 line receiver to maximum an on-board 1.4 V reference through the front panel, and the 13.1 ms to 200 ns Accuracy: Percent Error = TTL signal to the noninverting input. 100*(200 ns/Period) The user interface of the Intelligent Counter/Controller 16-bit Enhanced-Resolution Counter: 858.9 s to is implemented by a 15 MHz 68HC000 CPU supported by 800 ns 64 Kbyte of EPROM firmware, 128 Kbyte of Requires two 16-bit counters zero-wait-state static RAM, and highly-integrated control and interrupt logic. The VMEbus host programs the ICC by 32-bit Integer Operations: Requires two 16-bit queueing function control blocks in local memory and counters for pulse-width operation issuing commands. The CPU responds to the commands by Requires three 16-bit counters for period measurement interpreting the function control blocks, configuring the operation system timing controllers, and then acknowledging the host 16-bit Prescaler Range: ÷2-65536 with 400 ns command. Once configured, the CPU maintains data resolution structures of measurement data in local memory and interrupts the VMEbus host when a measurement or control process is complete. FREQUENCY MEASUREMENT The slave VMEbus interface of the VMIVME-2540 Input Frequency Range/Accuracy locates the 64 Kbyte VMEbus local memory window in A32 16-bit Counter: 0.0076 Hz to 2.5 MHz or A24 address space with DIP switches, with nonprivileged 0.007 to 76 Hz Accuracy: 0.015 percent maximum and/or Supervisory access. The VMEbus host must arbitrate with the 68HC000 CPU for local bus access since the RAM 76 Hz to 2.5 MHz Accuracy: Percent Error = 100* is shared. The data accesses may be D32, D24, D16, and (Frequency/5 MHz) D08, and unaligned transfers are supported. Because the 16-bit Enhanced-Resolution Counter: 0.001 Hz local CPU executes its code from RAM, the arbiter to 1.25 MHz relinquishes control of the local resources after a single VMEbus data transfer. Requires two 16-bit counters 16-bit Prescaler Range: ÷2-65536 with 2.5 MHz The Intelligent Counter/Controller supports two maximum clock rate VMEbus interrupter modules which may assert any of two IRQ levels simultaneously. When serviced, the interrupter PERIOD/PULSE TRAIN GENERATION modules respond with an 8-bit interrupt vector and Pulse Repetition Rate: 0.0038 Hz to 2.5 MHz automatically clear the pending IRQ. The CPU maintains a queue of pending interrupt events in memory, writing a new Period Range: 262.1 s to 400 ns IRQ to the interrupter modules when the previous event is Pulse-Width Range: 131 s to 200 ns cleared. 2 For Ordering Information, Call: 1-800-322-3616 or 1-256-880-0444 • FAX (256) 882-0859 VMIVME-2540 Pulse-Width Resolution (for Nonsquare Wave): The AM26LS33A differential receivers used on the VMIVME-2540 are capable of accepting inputs that vary 131 s to 13.1 ms: 0.015 percent maximum greatly on voltage and time domain. Care must be taken to 13.1 ms to 200 ns: Percent Error = 100* ensure that the input voltages are stable around V when TTL (200 ns/Pulse Width) in single-ended mode or spurious data will be produced. Similarly, when using differential inputs, care must be taken PERIODIC VMEbus INTERRUPT GENERATION to ensure that the inputs, are not allowed to float with voltage values within 100 mV of each other or data VMEbus IRQ Levels/Vectors: IRQ1 to IRQ7, 8-bit transitions may be generated. vector OUTPUT BUFFER SPECIFICATIONS IRQ Repetition Rate: 0.0076 to 1,000 Hz AM26LS31 Short Circuit Current: I = -60 mA typical QUADRATURE POSITION MEASUREMENT SC Sin/Cos Input Range: DC to 1 MHz Differential Output Voltage: | V | = 2 V t minimum Accuracy: ±1/4 wave/5 MHz sample rate Requires two channels per Encoder TEMPERATURE PHYSICAL SPECIFICATIONS Operating: 0 to 65 ˚C Power Requirements: +5 V ± 5/-2.5 percent Nonoperating: -40 to 85 ˚C 4.25 A typical Humidity: 5 to 95 percent RH noncondensing 5 A maximum ANSI/IEEE 1014-1987 IEC 821 and 297 INPUT BUFFER SPECIFICATIONS VMEbus COMPLIANCE Common-Mode Voltage Limit: ±25 V A32/D32 DTB Slave Differential Mode Voltage Limit: ±5 V Base address selectable on 64 Kbyte boundaries The differential voltage range is limited to ±5 V due to Supervisory/Nonprivileged Address Modifier Codes a 1/4 W, 120 Ω termination resistor Dual Interrupter Modules assert any of IRQ1 to IRQ7 V V Differential Mode: RS-422-compliant Board size 160 x 233.4 mm IH/ IL differential input INTERFACE: DISCRETE WIRE CONNECTORS V : Occurs whenever the primary (positive) input IH AND TERMINAL BLOCKS — The VMIVME-2540 has voltage is 100 mV greater than the differential a large amount of front panel I/O which must be broken out (negative) input voltage within the common-mode by cabling and possibly rack-mounted terminal blocks. If voltage range of ±25 V. the user wishes to use discrete wire connectors and cables, V : Occurs whenever the primary (positive) input IL the suggested manufacturer is Harting Elektronik, Inc., voltage is 100 mV less than the differential (negative) 2155 Stonington Ave., Suite 212, P.O. Box 95710, Hoffman input voltage within the common-mode voltage range Estates, Illinois 60195-0710, (312) 519-7700. The of ±25 V. recommended connector components for cabling to P3 and P4 are given in the table below. V V Unipolar (Single-Ended) Mode IH/ IL (Differential Input Connected to V : TTL) Recommended Discrete Wire Connectors and Accessories V V + 100 mV IH = TTL Component Harting Catalog No. V V - 100 mV IL = TTL 96-pin Discrete Wire Connector 0903-096-3214 Female Crimp Contacts 0902-000-8484 Connector Shell Housing 0903-096-0501 Input Hysteresis: 50 mV Left Locking Lever 0902-000-9902 Right Locking Lever 0902-000--9903 Input Rise Time Recommendations: Minimum rise time - 5 ns Propagation delay - 25 ns typical Maximum rise time - 1 ms VMIC • 12090 South Memorial Parkway • Huntsville, Alabama 35803-3308 3 VMIVME-2540 The RS-422 differential signals should be connected by If the user wishes the I/O signals from the twisted pair insulated wires, 24 AWG solid or VMIVME-2540 front panel to be broken out at terminal stranded-copper conductors (R < 30 Ω/ blocks, the VMIACC-BT04 Dual 96-pin Transition Panel is 1,000 ft for other conductors), with a maximum cable length suggested. The VMIACC-BT04 is a 19-inch rack-mountable of 4,000 feet. Care should be taken to ensure that each signal panel which breaks all 192 signals out from two DIN 96-pin group is properly grounded for reliable operation. connectors to standard terminal blocks. Connection between the VMIACC-BT04 and the VMIVME-2540 front panel is TTL signals may be connected by flat 96-conductor made by 96-conductor ribbon cables, three foot length ribbon cable, 30 AWG insulated copper-stranded conductor. recommended. The corresponding female 96-pin DIN connector for flat-ribbon cable is ERNI 913.031 or similar. It is TRADEMARKS recommended that the total cable length be 50 feet or less for The VMIC logo is a registered trademark of VMIC. the TTL application with attention given to maximum signal Other registered trademarks are the property of their transition rate and signal degradation over distance. RS-422 respective owners. differential interface is clearly superior for longer cable lengths. DIN CONNECTOR DIN CONNECTOR IN GATE OUT IN GATE OUT IN GATE OUT IN GATE OUT GATE OUT IN GATE OUT IN 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 STC STC STC STC STC STC I/F NO. 2 I/F NO. 1 I/F NO. 3 I/F NO. 4 I/F NO. 5 I/F NO. 6 I/O DATA BUS 128 K 64K SRAM EPROM 5 MHz TRANSCEIVER STC STC CLOCK STATUS CPU LOCAL BUS 15 MHz 30 MHz CLOCK DIVIDER OSC STC LOCAL VMEbus 68000 INTERRUPTS VMEbus INTERRUPT INTERRUPT I/O PROCESSOR USER INTERFACE CONTROL MODULE INTERRUPTS VMEbus Figure 1. Intelligent Counter/Controller Block Diagram 4 For Ordering Information, Call: 1-800-322-3616 or 1-256-880-0444 • FAX (256) 882-0859