產(chǎn)品標題: DS200SLCCG3A燃機卡工控卡件PLC/DCS備件系統(tǒng)

型號：DS200SLCCG3A

品牌：GE

? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?產(chǎn)品詳情資料：

除了前面描述的地址轉(zhuǎn)換方法之外，MVME162LX上使用的VMEchip2版本1還包括一個可用于地址轉(zhuǎn)換的加法器。當啟用加法器時，通過將偏移值添加到VMEbus地址線VA<31..16>來生***地總線地址。偏移是地址轉(zhuǎn)換/偏移寄存器中的值。如果VMEbus傳輸是A24，則VMEbus地址線VA＜31…24＞在加法運算之前強制為0。加法器通過在寄存器$FFF40010中設置映射解碼器1的位11和映射解碼器2的位27來啟用。加法器允許將任何大小的電路板映射到任何64KB的邊界上。加法器被禁用，重置后使用地址替換方法。通過在屬性寄存器中設置寫后啟用位，為段啟用寫后。通過設置屬性寄存器中的窺探位來啟用段的本地總線窺探。當VMEbus到本地總線接口是本地總線主機時，屬性寄存器中的窺探位被驅(qū)動到本地總線。

? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ??產(chǎn)品英文詳情料:

In addition to the address translation method previously described, the Revision 1 of the VMEchip2 used on the MVME162LX includes an adder which can be used for address translation. When the adder is enabled, the local bus address is generated by adding the offset value to the VMEbus address lines VA<31..16>. The offset is the value in the address translation/offset register. If the VMEbus transfer is A24, then the VMEbus address lines VA<31..24> are forced to 0 before the add. The adders are enable by setting bit 11 for map decoder 1 and bit 27 for map decoder 2 in register $FFF40010. The adders allow any size board to be mapped on any 64KB boundary. The adders are disabled and the address replacement method is used following reset.Write posting is enabled for the segment by setting the write post enable bit in the attribute register. Local bus snooping for the segment is enabled by setting the snoop bits in the attribute register. The snoop bits in the attribute register are driven on to the local bus when the VMEbus to local bus interface is local bus master.