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A6500-UM通用測量卡
按ENTER鍵打開系統(tǒng)控制器子菜單，其中VMEbus系統(tǒng)資源被配置。
VME字節(jié)交換此字段用于配置VMEbus主和從字節(jié)交換選項(xiàng)。這個選項(xiàng)包括字節(jié)交換全部（默認(rèn)）、字節(jié)交換從屬、字節(jié)交換主和禁用。
主界面按ENTER鍵打開主界面子菜單，其中VMEbus主界面接口已配置。
從屬接口這是標(biāo)題，不是字段。從機(jī)1和2運(yùn)行模式
此字段允許配置VMEbus從設(shè)備1和2。選項(xiàng)包括可編程（默認(rèn)）且兼容。選擇可編程允許您：配置和啟用VMEbus從站1和2，就像從站3、4、5、6、7和8一樣。選擇兼容時(shí)，BIOS會自動配置并啟用VMEbus
從設(shè)備1和2。兼容設(shè)置XVME-660從設(shè)備接口，以便與未使用的舊Xycom Automation VME PC處理器板兼容宇宙芯片。
sla這些字段確定的前12位的基本VMEbus地址前綴
VMEbus從接口將響應(yīng)的地址。這三個字段是這12位的高（H）、中（M）和低（L）半字節(jié)。地址為HML00000h。在默認(rèn)屏幕配置中，H為A，M為A，L為4，因此地址為AA400000h。
這些值根據(jù)大小和地址空間字段值而變化。當(dāng)?shù)刂房臻g值為VMEbus標(biāo)準(zhǔn)，必須定位雙訪問存儲器
在1 MB邊界上，上兩個半字節(jié)被忽略，因此高和中半字節(jié)變?yōu)?，并變?yōu)橹蛔x。當(dāng)?shù)刂房臻g值為VMEbus擴(kuò)展時(shí)，從屬地址必須是從屬內(nèi)存大小的倍數(shù)。當(dāng)大小大于1 MB時(shí)，低半字節(jié)被截?cái)酁榕紨?shù)。
注意：使用這些字段設(shè)置的地址是VMEbus處理器。XVME-660上的PC/AT處理器將看到翻譯的
住址此轉(zhuǎn)換（以及轉(zhuǎn)換量）由BIOS和計(jì)算在BIOS設(shè)置中不可由用戶配置。關(guān)于翻譯的討論見第67頁地址。進(jìn)行應(yīng)保存的更改后，始終選擇退出或保存更改或保存更改。這兩個過程都將更改存儲在電池支持的CMOS RAM中。
下次啟動計(jì)算機(jī)時(shí)，BIOS將根據(jù)設(shè)置選擇存儲在CMOS中。如果這些值導(dǎo)致系統(tǒng)引導(dǎo)失敗，重新啟動并進(jìn)入BIOS設(shè)置。在BIOS設(shè)置中，您可以加載默認(rèn)值（加載設(shè)置默認(rèn)值）或嘗試更改導(dǎo)致啟動失敗的選擇。
Press ENTER to open the System Controller submenu, where VMEbus system resources
are configured.
VME Byte Swaps This field is used to configure VMEbus Master and Slave byte-swapping options. The
choices are Byte Swap All (default), Byte Swap Slave, Byte Swap Master, and Disabled.
Master Interface Press ENTER to open the Master Interface submenu, where the VMEbus master
interface is configured.
Slave Interface This is a heading, not a field.
Slave 1 & 2 Operational
Mode
This field allows configuration of VMEbus Slaves 1 and 2. The choices are
Programmable (default) and Compatible. Selecting Programmable allows you to
configure and enable VMEbus slaves 1 and 2 just like slaves 3, 4, 5, 6, 7, and 8.
When Compatible is selected, the BIOS automatically configures and enables VMEbus
slaves 1 and 2. Compatible sets up the XVME-660 slave interface so that it is
compatible with older Xycom Automation VME PC processor boards which did not use
the Universe chip. SlaThese fields determine the base VMEbus address prefix for the first 12 bits of the
address to which the VMEbus slave interface will respond. The three fields are the
high (H), middle (M), and low (L) nibbles of these 12 bits. The address is HML00000h.
In the default screen configuration H is A, M is A, and L is 4, so the address is
AA400000h.
The values change depending on the Size and Address Space field values. When the
Address Space value is VMEbus Standard, the dual-access memory must be located
on a 1 MB boundary and the upper two nibbles are ignored, so the high and medium
nibbles are changed to 0 and are made read-only. When the Address Space value is
VMEbus Extended, the slave address must be a multiple of the slave memory size.
When the Size is greater than 1 MB, the low nibble is truncated to an even value.
Note: The address that is set with these fields is the address that is used by the
VMEbus processors. The PC/AT processor on the XVME-660 will see a translated
address. This translation (and the amount of translation) is calculated by the BIOS and
is not user-configurable in the BIOS setup. See p. 67 for a discussion of translation
addresses. After making changes that should be saved, always select either Exit Saving Changes
or Save Changes. Both procedures store the changes in battery-backed CMOS RAM.
The next time you boot your computer, the BIOS configures your system according to
the setup selections stored in CMOS. If those values cause the system boot to fail,
reboot and enter the BIOS setup. In the BIOS setup, you can load the default values
(Load Setup Defaults) or try to change the selections that caused the boot to fail.
