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(hào)的隔離源。 您可以針對(duì)電壓或電流輸出配置每個(gè)獨(dú)立隔離的數(shù)模轉(zhuǎn)換器(DAC)通道。 對(duì)于電壓，可選擇三個(gè)單極或三個(gè)雙極范圍中的任一個(gè)。 軟件可配置的SCXI?1124具有板載EEPROM，用于存儲(chǔ)校準(zhǔn)常數(shù)。 它是需要通過(guò)隔離電壓或電流輸出來(lái)控制過(guò)程的應(yīng)用的理想選擇。
NI SCXI-1124模擬輸出模塊MEbus中斷確認(rèn)映射VMEbus將中斷確認(rèn)周期與通過(guò)激活I(lǐng)ACK*信號(hào)線進(jìn)行其他循環(huán)。它還指定了使用A03-A01確認(rèn)的液位。VMEchip監(jiān)控這些線路，并在收到IACKIN*后，通過(guò)如果IACKOUT*在已確認(rèn)的級(jí)別，或者通過(guò)返回狀態(tài)/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(nèi)部寄存器的說(shuō)明以及每個(gè)寄存器內(nèi)的位分配。所有寄存器可能是作為字節(jié)寫入或讀取。某些限制適用于位集和清除如有指示，則不應(yīng)使用說(shuō)明。一PCC的整體視圖如表4-1所示。請(qǐng)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(tài)位。該位可讀寫。C將1寫入該位將其清除。該位讀數(shù)為0。R/C該位可讀。將1寫入該位會(huì)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.
