UFC911B108 3BHE037864R0108控制处理卡件,ABB使用方法

系统重置功能（SYSRESET*）即使SYSRESET*不是VMEbus系统控制器功能，MVME147启用/禁用其SYSRESET*功能同时启用/禁用其系统控制器功能。当MVME147是系统控制器时，它驱动每当生成板载重置时，SYSRESET*信号线（它未完全实现VMEbus的SYSRESET*定时功率监视器）。VMEbus断续器VMEchip包含一个灵活的多级总线中断器单元该模块可以在以下时间激活VMEbus上的中断：七种中断级别中的任何一种。

UFC911B108 3BHE037864R0108控制处理卡件VMEchip中断器还监视VMEbus以确定当中断确认周期正在进行时。当VMEchip接收来自VMEbus，目前正在确认级别中断，它用状态/ID向量进行响应。否则，它会生成一个中断VMEbus的确认输出信号。VMEchip是一个8位中断器，因此响应所有大小的中断确认周期。本地总线超时VMEchip为MC68030本地提供超时功能公共汽车当计时器超时时，总线错误信号被发送到MC68030。可在软件中选择102µs的超时值，205µs、410µs或无穷大。注：本地总线计时器在VMEbus期间不工作绑定周期。VMEbus绑定周期由VMEbus访问计时器和全局计时器（非必须在模块上）。VMEbus访问超时VMEchip提供VMEbus访问超时计时器。如果MVME147在所选时间内未被授予VMEbus期间，MC68030接收总线错误信号（除非周期为写入已发布）。时间段可在软件中选择102µs，1.6 ms、51 ms或无穷大。

System Reset Function (SYSRESET*)

Even though SYSRESET* is not a VMEbus system controller

function, the MVME147 enables/disables its SYSRESET* function

at the same time that it enables/disables its system controller

functions. When the MVME147 is system controller, it drives the

SYSRESET* signal line whenever an onboard reset is generated (it

does not fully implement the SYSRESET* timing of a VMEbus

power monitor).

VMEbus Interrupter

The VMEchip incorporates a flexible, multilevel bus interrupter

module. This module can activate an interrupt on the VMEbus at

any of the seven interrupt levels.

The VMEchip interrupter also monitors the VMEbus to determine

when an interrupt acknowledge cycle is in process. When the

VMEchip receives an interrupt-acknowledge-in signal from the

VMEbus and it is currently interrupting at the acknowledge level,

it responds with a status/ID vector. Otherwise, it generates an

interrupt-acknowledge-out signal to the VMEbus. The VMEchip is

a 8-bit interrupter and consequently responds to all sizes of

interrupt acknowledge cycles. Local Bus Time-Out

The VMEchip provides a time-out function for the MC68030 local

bus. When the timer times out, a bus error signal is sent to the

MC68030. The time-out value is selectable in software for 102 µs,

205 µs, 410 µs, or infinite.

Note The local bus timer does not operate during VMEbus

bound cycles. VMEbus bound cycles are timed by the

VMEbus access timer and by the global timer (not

necessarily on the module).

VMEbus Access Time-Out

The VMEchip provides a VMEbus access time-out timer. If the

MVME147 is not granted the VMEbus within the selected time

period, the MC68030 receives a bus error signal (unless the cycle is

write posted). The time period is selectable in software for 102 µs,

1.6 ms, 51 ms, or infinite.