UFC911B108 3BHE037864R0108控制處理卡件,ABB使用方法
系統重置功能（SYSRESET*）即使SYSRESET*不是VMEbus系統控制器功能，MVME147啟用/禁用其SYSRESET*功能同時啟用/禁用其系統控制器功能。當MVME147是系統控制器時，它驅動每當生成板載重置時，SYSRESET*信號線（它未完全實現VMEbus的SYSRESET*定時功率監視器）。VMEbus斷續器VMEchip包含一個靈活的多級總線中斷器單元該模塊可以在以下時間激活VMEbus上的中斷：七種中斷級別中的任何一種。
UFC911B108 3BHE037864R0108控制處理卡件VMEchip中斷器還監視VMEbus以確定當中斷確認周期正在進行時。當VMEchip接收來自VMEbus，目前正在確認級別中斷，它用狀態/ID向量進行響應。否則，它會生成一個中斷VMEbus的確認輸出信號。VMEchip是一個8位中斷器，因此響應所有大小的中斷確認周期。本地總線超時VMEchip為MC68030本地提供超時功能公共汽車當計時器超時時，總線錯誤信號被發送到MC68030。可在軟件中選擇102μs的超時值，205μs、410μs或無窮大。注：本地總線計時器在VMEbus期間不工作綁定周期。VMEbus綁定周期由VMEbus訪問計時器和全局計時器（非必須在模塊上）。VMEbus訪問超時VMEchip提供VMEbus訪問超時計時器。如果MVME147在所選時間內未被授予VMEbus期間，MC68030接收總線錯誤信號（除非周期為寫入已發布）。時間段可在軟件中選擇102μs，1.6 ms、51 ms或無窮大。
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.
