User manual AOPEN AP53-AMI

[. . . ] Chapter 3 AMI BIOS Utility This chapter tells how to configure the system by setting the BIOS parameters. 3. 1 Entering the AMI BIOS Setup To enter the AMI BIOS Setup, press c. The AMI BIOS Setup Main Menu appears as shown below. The AMI BIOS is in Windows form. You can use either the keyboard or a mouse to move between the items. To select among the Setup menu groups, use v to highlight the selected group or simply click on the icon of the selected Setup menu. 3-1 AMI BIOS Utility To select among the options, you can either use the arrow keys to move the highlight bar or simply click on the icon of the desired option. [. . . ] If you do not know this information, enable all the ROM shadow settings. This ensures shadowing of any present ROMs and reduces the available memory . Select Cached if the data in the chosen addresses are already copied into RAM. The default setting is Disabled. The F000 and E000 addresses are exclusively shadowed for BIOS. 3-11 AMI BIOS Utility 3. 2. 3 Chipset Features Setup The Chipset Features Setup controls the board chipset settings. The controls for this menu are the same as for the previous screens. The Chipset Features Setup screen appears as follows. To scroll down the rest of the parameters, press }. Use w or y to highlight the desired parameter. 3-12 AMI BIOS Utility Memory Hole This option lets you assign the system memory area to avoid memory conflicts. The settings are 512~640K, 15~16M and Disabled. 8-bit I/O Recovery Time (Sysclk) This parameter allows you to set the response time of the 8-bit I/O devices connected to your system. The settings range from 1-7 SYSCLK and Disabled. 16-bit I/O Recovery Time (Sysclk) This parameter allows you to set the response time of the 16-bit I/O devices connected to your system. The settings range from 1-4 SYSCLK and Disabled. DRAM Timing The selections for this parameter are 60 ns, 70 ns, and Manual. If you select either 60 ns or 70 ns, the DRAM Timing subparameters become nonconfigurable since BIOS automatically sets the values. Select Manual if you want to specify your own parameter settings. DRAM REFRESH RATE This option lets you specify the DRAM refresh rate. The selections are 50 MHz, 60 MHz, 66 MHz, and Reserved. ISA CLOCK DIVISOR This option specifies the system bus clock divisor. The selections are PCICLK/4 and PCICLK/3. TURBO READ LEAD OFF When enabled, the BIOS skips the first input register in the DRAM when reading data and therefore, speeds up the data read timings. Disable the option to bypass the feature. DRAM READ BURST TIMING This parameter adjusts the read wait state between L2 and DRAM cache. Everytime the CPU reads L2 cache miss, it reads four continuous memory 3-13 AMI BIOS Utility cycles on four continues addresses from the DRAM cache. Therefore, it has four settings to adjust. The parameter settings are X-4-4-4, X-3-3-3, and X-2-2-2. Faster DRAMs require shorter wait states. The value of X depends on the DRAM Lead-off Timing parameter setting. The default is X-4-4-4. DRAM WRITE BURST TIMING This parameter adjusts the write wait state between L2 and DRAM cache. [. . . ] Click on e. 2. 3-25 AMI BIOS Utility 3. Enter the password when a confirmation box appears. 3. 3. 2 User Password If you enabled the User password, it is impossible to boot the computer and enter Setup without entering the correct password. To set a User password, select User from the Security window. The following screen appears: For instructions on how to enter a password, follow the procedures listed in section 3. 3. 1. 3. 3. 3 Anti-virus Select Anti-Virus from the Security window to display the following option box. The virus protection options allow you to enable or disable the virus protection feature. [. . . ]