Motorola MVME166D2 manual Connectors, Programmable Tick Timers, Watchdog Timer, Local Bus Timeout

Functional Description

Programmable Tick Timers

Four 32-bit programmable tick timers with 1 μs resolution are provided, two in the VMEchip2 and two in the PCCchip2. The tick timers can be programmed to generate periodic interrupts to the processor.

Watchdog Timer

1

A watchdog timer function is provided in the VMEchip2. When the watchdog timer is enabled, it must be reset by software within the programmed time or it times out. The watchdog timer can be programmed to generate a SYSRESET signal, local reset signal, or board fail signal if it times out.

Software-Programmable Hardware Interrupts

Eight software-programmable hardware interrupts are provided by the VMEchip2. These interrupts allow software to create a hardware interrupt.

Local Bus Timeout

The MVME166 provides a timeout function for the local bus. When the timer is enabled and a local bus access times out, a Transfer Error Acknowledge (TEA) signal is sent to the local bus master. The timeout value is selectable by software for 8 μsec, 64 μsec, 256 μsec, or infinite. The local bus timer does not operate during VMEbus or VSB bound cycles. VMEbus bound cycles are timed by the VMEbus access timer and the VMEbus global timer. VSB bound cycles are timed by the VSB access timer, the VSB transfer timer, and if its serial arbiter is enabled, by the VSB arbitration timer.

Connectors

The MVME166 has two 96-position DIN connectors: P1 and P2. P1 rows A, B, C, and P2 row B provide the VMEbus interconnection. P2 rows A and C, on the MVME166, provide the connection to the VSB. The MVME166 has a 20-pin connector mounted behind the front panel. When the MVME166 board is enclosed in a chassis and the front panel is not visible, this connector allows the reset, abort and LED functions to be extended to the control panel of the system, where they are visible. The MVME166 has a 68-pin mini D ribbon shielded connector for the SCSI bus interface. The MVME166 has a 100-pin mini D ribbon shielded connector for the serial ports, Ethernet, and printer.

MVME166IG/D2 1-17