IS200DTAIH1ABB IS210DTAOH1AA燃機卡件，GE實驗數據
EEPROM通電/斷電注意事項MVME147不提供對意外寫入的保護可能在通電或斷電時發生的EEPROM。大多數設備提供一定程度的內部保護。獲得帶有附加“軟件”的“絕對保護”裝置建議使用“保護”。中斷處理程序MC68030可能會被多個電源中斷。所有中斷源是軟件啟用/禁用的。有些人有軟件可編程電平和所有中斷源提供一個矢量在中斷確認周期內。PCC芯片解碼MC68030地址總線和功能確定中斷周期何時進行的代碼。
IS200DTAIH1ABB IS210DTAOH1AA燃機卡件當PCC在其水平上檢測中斷確認周期中斷，它傳遞狀態/ID向量。否則向VMEchip生成中斷確認輸出信號。
當VMEchip在信號中檢測到中斷確認時從PCC，它在該級別中斷，它通過一個狀態/ID向量。否則，它將請求VMEbus的主控權（如果沒有主控權），并驅動VMEbus信號啟動中斷確認周期的線路。打斷從機返回狀態/ID向量。在一個級別內，來自PCC的中斷具有最高的VMEchip和VMEbus中斷后的優先級最低優先級。前面板開關和指示燈MVME147的前面板上有兩個開關。這個開關復位并中止。重置開關重置所有車載設備并驅動系統重置*如果MVME147是系統控制器。復位開關可能是被軟件禁用。請參閱復位和中止開關本章第節。啟用時，中止開關生成7級中斷。它是通常用于中止程序執行并返回到調試器。中止開關可以通過軟件禁用。提到
本章中的重置和中止開關部分。
MVME147的前面板上有四個LED指示燈。
指示器為RUN、STATUS、FAIL和SCON。
? 當MC68030地址選通（AS*）引腳低時，RUN點亮。
? 當MC68030狀態*引腳低時，狀態點亮。
? 當在中設置Board FAIL（BRDFAIL）位時，FAIL點亮
VMEchip或PCC中出現看門狗超時時。
? 當MVME147是VMEbus系統時，SCON點亮
控制器（由跳線J3選擇）。
EEPROM Power-Up/Power-Down Considerations
The MVME147 provides no protection against inadvertent writes to
EEPROM that might happen at power-up or power-down time.
Most devices provide some level of internal protection. To gain
“absolute protection” devices with additional “software
protection” are recommended.
Interrupt Handler
The MC68030 may be interrupted by many sources. All interrupt
sources are software enabled/disabled. Some have software
programmable levels and all interrupt sources supply a vector
during an interrupt acknowledge cycle.
The PCC chip decodes the MC68030 address bus and function
codes to determine when an interrupt cycle is in progress. When the
PCC detects an interrupt acknowledge cycle at the level it is
interrupting on, it passes a status/ID vector. Otherwise, it
generates an interrupt acknowledge out signal to the VMEchip.
When the VMEchip detects an interrupt acknowledge in signal
from the PCC and it is interrupting at that level, it passes a
status/ID vector. Otherwise, it requests mastership of the VMEbus
(if it does not have mastership), and it drives the VMEbus signal
lines to initiate an interrupt acknowledge cycle. The interrupting
slave returns a status/ID vector.
Within a level, the interrupts from the PCC have the highest
priority followed by the VMEchip and the VMEbus interrupts have
the lowest priority. Front Panel Switches and Indicators
There are two switches on the front panel of the MVME147. The
switches are RESET and ABORT.
The RESET switch resets all onboard devices and drives SYSRESET*
if the MVME147 is the system controller. The RESET switch may be
disabled by software. Refer to the RESET and ABORT Switches
section in this chapter.
The ABORT switch generates a Level 7 interrupt when enabled. It is
normally used to abort program execution and return to the
debugger. The ABORT switch may be disabled by software. Refer to
the RESET and ABORT Switches section in this chapter.
There are four LED indicators on the front panel of the MVME147.
The indicators are RUN, STATUS, FAIL, and SCON.
? RUN is lit when the MC68030 Address Strobe (AS*) pin is low.
? STATUS is lit when the MC68030 STATUS* pin is low.
? FAIL is lit when the Board Fail (BRDFAIL) bit is set in the
VMEchip or when watchdog time-out occurs in the PCC.
? SCON is lit when the MVME147 is the VMEbus system
controller (selected by jumper J3).
