PNEUTRONICS 990-004763-015模擬計(jì)算機(jī) PCB 卡
1.產(chǎn) 品 資 料 介 紹：
中文資料：
這個(gè)問(wèn)題不能通過(guò)簡(jiǎn)單地將PNEUTRONICS 990-004763-015連接到與其字節(jié)通道交叉的VME總線來(lái)解決。例如，PNEUTRONICS 990-004763-015使用D0-D7將一個(gè)字節(jié)傳輸?shù)降刂?00，而VME總線需要使用D8-D15。出于這個(gè)原因，PNEUTRONICS 990-004763-015 PCI到VMEbus接口中加入了特殊的硬件，以便于在不同的情況下進(jìn)行不同類型的字節(jié)交換。
Endian轉(zhuǎn)換硬件Universe II芯片在PCI和VMEbus接口之間執(zhí)行地址不變轉(zhuǎn)換。地址不變映射或“非端點(diǎn)轉(zhuǎn)換”模式保持兩個(gè)接口之間的字節(jié)順序（即，源自PCI側(cè)的小端點(diǎn)模式的數(shù)據(jù)將保持在接口的VMEbus側(cè)的小端模式）。然而，PNEUTRONICS 990-004763-015 PCI到VMEbus接口具有外部端序轉(zhuǎn)換邏輯，該邏輯允許應(yīng)用程序執(zhí)行獨(dú)立的主/從硬件端序轉(zhuǎn)換。
英文資料：
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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3.主 營(yíng) 品 牌
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