DS200SLCCG3A燃机卡工控卡件PLC/DCS备件系统

产品标题: DS200SLCCG3A燃机卡工控卡件PLC/DCS备件系统

型号：DS200SLCCG3A

品牌：GE

                                                       产品详情资料：

除了前面描述的地址转换方法之外，MVME162LX上使用的VMEchip2版本1还包括一个可用于地址转换的加法器。当启用加法器时，通过将偏移值添加到VMEbus地址线VA<31..16>来生***地总线地址。偏移是地址转换/偏移寄存器中的值。如果VMEbus传输是A24，则VMEbus地址线VA＜31…24＞在加法运算之前强制为0。加法器通过在寄存器$FFF40010中设置映射解码器1的位11和映射解码器2的位27来启用。加法器允许将任何大小的电路板映射到任何64KB的边界上。加法器被禁用，重置后使用地址替换方法。通过在属性寄存器中设置写后启用位，为段启用写后。通过设置属性寄存器中的窥探位来启用段的本地总线窥探。当VMEbus到本地总线接口是本地总线主机时，属性寄存器中的窥探位被驱动到本地总线。

                                                        产品英文详情料:

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.