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20-channel counter/timer cards

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AVAILABLE from Interworld Electronics are the PCIDCC-P Series 5, 10, and 20-channel Counter/Timer Cards. Features include independent 16-bit counters that are cascadeable, interrupt handling, and measurement frequency to 7MHz. These cards are supported by major application software packages.

The PCIDCC5/10/20-P series consists of three different models: the PCIDCC5-P, PCIDCC10-P, and the PCIDCC20-P.

The PCIDCC20-P contains four AM9513 System Timing Controller LSI circuits. Each AM9513 consists of five independent 16 bit up/down counters.

The PCIDCC10-P contains two AM9513 circuits and the PCIDCC5-P contains one. The PCIDCC5-P does, however, contain an 8-bit input port and an 8-bit output port in addition to the 9513.

The PCIDCC10-P and PCIDCC20-P are physically the same board except for the difference in the number of counters. On the PCIDCC10-P and PCIDCC20-P, the signals for each counter are available on independent 26-pin headers; on the PCIDCC5-P, the signals are available on a DB37 male connector.

The counters can be programmed to count up or count down in either binary or BCD. A selection of various internal and external frequency sources and outputs may be chosen as inputs for individual counters with software selectable active-high or active-low polarities. Each counter may be gated by either software or hardware.

Each counter has associated with it a Load Register and a Hold Register.

Load Registers are used to automatically reload the counter to any predefined value, thus controlling the effective count period.

Each counter has a single dedicated output pin. Considerable versatility for configuring both the input and the gating of individual counters is provided. This not only permits dynamic re-assignment of inputs under software control, but also allows multiple counters to use a single input, allows a single gate input to control more than one counter, and allows for cascading.

Interrupts from counter outputs or external sources are supported. The Interrupt Request Level (IRQ) is selected by the PCI compatible BIOS.

Each slot on the PCI motherboard is assigned one IRQ. If a conflict arises from the IRQ selected by the BIOS, simply move the PCIDCC5/10/20-P to a different slot. On the PCIDCC5-P, if an Interrupt Enable input at I/O connector pin 2 is held high, the interrupt function is disabled.

Conversely, if the Interrupt Enable input is held low, a rising edge on the Interrupt Input, pin 1, will generate an interrupt on the selected level. Interworld Electronics 03 9563 5011.

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