EMERSON VE4036P2控制器
VMEbus橋除了其PC/AT功能之外，VMIVME-7750具有以下VMEbus功能：?完整的六行地址修改器（AM代碼）可編程性?VME數(shù)據(jù)接口，具有獨(dú)立的硬件字節(jié)/字交換，用于主和從訪問(wèn)?支持VME64多路MBLT 64位VMEbus塊傳輸?用戶配置中斷器?用戶配置的中斷處理器?系統(tǒng)控制器模式，具有可編程VMEbus仲裁器（支持PRI、SGL和RRS模式）?VMEbus BERR總線錯(cuò)誤計(jì)時(shí)器（軟件可編程）?從VMEbus到本地RAM和郵箱寄存器的從屬訪問(wèn)?全功能可編程VMEbus請(qǐng)求器（支持ROR、RWD和BCAP模式）?系統(tǒng)控制器自動(dòng)檢測(cè)?通過(guò)五個(gè)單獨(dú)的保護(hù)模式內(nèi)存窗口完成VMEbus主訪問(wèn)VMIVME-7750支持主配置和從配置中的字節(jié)、字和長(zhǎng)字的高吞吐量DMA傳輸。如果不需要Endian轉(zhuǎn)換，VMIC提供了一種特殊的“繞過(guò)”模式，可用于進(jìn)一步提高吞吐量（不適用于字節(jié)傳輸）。
VMEbus Bridge
In addition to its PC/AT functions, the VMIVME-7750 has the following VMEbus
features:
? Complete six-line Address Modifier (AM-Code) programmability
? VME data interface with separate hardware byte/word swapping for master
and slave accesses
? Support for VME64 multiplexed MBLT 64-bit VMEbus block transfers
? User-configured interrupter
? User-configured interrupt handler
? System Controller mode with programmable VMEbus arbiter
(PRI, SGL and RRS modes are supported)
? VMEbus BERR bus error timer (software programmable)
? Slave access from the VMEbus to local RAM and mailbox registers
? Full-featured programmable VMEbus requester
(ROR, RWD and BCAP modes are supported)
? System Controller auto detection
? Complete VMEbus master access through five separate Protected-mode
memory windows
The VMIVME-7750 supports High Throughput DMA transfers of bytes, words and
longwords in both Master and Slave configurations.
If Endian conversion is not needed, VMIC offers a special “Bypass” mode that can be
used to further enhance throughput (not available for byte transfers).
