NI SCXI-1124模擬輸出模塊用于SCXI的6通道模擬輸出模塊 - SCXI?1124是用于DC（低帶寬）電壓或電流信號的隔離源。 您可以針對電壓或電流輸出配置每個獨立隔離的數模轉換器(DAC)通道。 對于電壓，可選擇三個單極或三個雙極范圍中的任一個。 軟件可配置的SCXI?1124具有板載EEPROM，用于存儲校準常數。 它是需要通過隔離電壓或電流輸出來控制過程的應用的理想選擇。
NI SCXI-1124模擬輸出模塊MEbus中斷確認映射VMEbus將中斷確認周期與通過激活IACK*信號線進行其他循環。它還指定了使用A03-A01確認的液位。VMEchip監控這些線路，并在收到IACKIN*后，通過如果IACKOUT*在已確認的級別，或者通過返回狀態/ID向量（如果是）。MVME147可以處理由其擁有VMEchip。介紹本章提供了編程所需的信息外圍通道控制器（PCC）和VMEchip。編程外圍通道控制器這些部分包含PCC內部寄存器的說明以及每個寄存器內的位分配。所有寄存器可能是作為字節寫入或讀取。某些限制適用于位集和清除如有指示，則不應使用說明。一PCC的整體視圖如表4-1所示。請注意，在8位PCC寄存器定義的表中下面，底線中的字符定義寄存器位上可能的操作如下：R該位是只讀狀態位。該位可讀寫。C將1寫入該位將其清除。該位讀數為0。R/C該位可讀。將1寫入該位會將其清除。
VMEbus Interrupt Acknowledge Map
The VMEbus distinguishes interrupt acknowledge cycles from
other cycles by activating the IACK* signal line. It also specifies the
level that is being acknowledged using A03-A01. The VMEchip
monitors these lines and after receiving IACKIN*, it responds by
asserting IACKOUT* if it was not generating an interrupt at the
acknowledged level, or by returning a status/ID vector if it was.
The MVME147 may handle a VMEbus interrupt generated by its
own VMEchip.Introduction
This chapter provides the information needed to program the
Peripheral Channel Controller (PCC) and the VMEchip.
Programming the Peripheral Channel
Controller
These sections contain a description of the PCC internal registers
and the bit assignments within each register. All registers may be
written or read as bytes. Some restrictions apply to bit set and clear
instructions and they should not be used, where indicated. An
overall view of the PCC is shown in Table 4-1.
Note In the tables for the 8-bit PCC register definitions that
follow, the characters in the bottom line define the
operations possible on the register bits, as follows:
R This bit is a read-only status bit.
R/W This bit is readable and writable.
C Writing a 1 to this bit clears it. This bit reads 0.
R/C This bit is readable. Writing a 1 to this bit clears it.
