PNEUTRONICS 990-004763-015模拟计算机 PCB 卡
1.产 品 资 料 介 绍：
中文资料：
这个问题不能通过简单地将PNEUTRONICS 990-004763-015连接到与其字节通道交叉的VME总线来解决。例如，PNEUTRONICS 990-004763-015使用D0-D7将一个字节传输到地址$00，而VME总线需要使用D8-D15。出于这个原因，PNEUTRONICS 990-004763-015 PCI到VMEbus接口中加入了特殊的硬件，以便于在不同的情况下进行不同类型的字节交换。
Endian转换硬件Universe II芯片在PCI和VMEbus接口之间执行地址不变转换。地址不变映射或“非端点转换”模式保持两个接口之间的字节顺序（即，源自PCI侧的小端点模式的数据将保持在接口的VMEbus侧的小端模式）。然而，PNEUTRONICS 990-004763-015 PCI到VMEbus接口具有外部端序转换逻辑，该逻辑允许应用程序执行独立的主/从硬件端序转换。
英文资料：
The problem cannot be solved by simply connecting the PNEUTRONICS 990-004763-015 to the VMEbus with its byte lanes crossed. For example, the PNEUTRONICS 990-004763-015 uses D0-D7 to transfer a byte to address $00, while the VMEbus requires D8-D15 be used. For this reason, special hardware has been incorporated into the PNEUTRONICS 990-004763-015 PCI-to-VMEbus interface to facilitate different kinds of byte swapping for varying circumstances.
Endian Conversion Hardware The Universe II chip performs Address Invariant translation between the PCI and VMEbus interfaces. Address Invariant mapping or “Non-endian conversion” mode maintains the byte ordering between the two interfaces (i.e. data originating in Little Endian mode on the PCI side will remain in Little Endian mode on the VMEbus side of the interface). However, the PNEUTRONICS 990-004763-015 PCI-to-VMEbus interface has external endian conversion logic which allows the application to perform independent master/slave hardware endian conversion.
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