just 8ns

search for floppy drive at startup DRAM ECC Checking Disabled, do not perform ECC detection Chipset Features Setup DIMM 1DRAM Timing 8NS, memory speed to the fastest 8ns (such as your memory is not supported to reduce the corresponding grade) SDRAM CAS Latency 2, the memory speed is set to the fastest-2 (if your memory is not supported then reduce the cor

First, the BIOS optimization settings On the first page of the BIOS setup we go to the "Advanced BIOS features" option, move the cursor to the "Frist Boot Device" option, press "PageUp" and "PageDown" to choose, the default value is "floppy", This means that the system will first read the boot information from the floppy drive, which will increase the startup time of the machine and shorten the life of the floppy drive. So we're going to choose "hdd-0" to boot directly from the hard drive, so i

FPGA2IC, FPGA_CLK is the source register clock, however EXT_CLK is the purpose register clock.Data delay = 2nsData delay ' = = 2ns-2ns= 0nsData delayData delay after the clock difference actionIndicates: Data delay 2ns, that is, 2ns data to reach the destination register, that is, the settling time 8ns, but because the clock offset 2ns effect to the data offset, the equivalent of data no delay. The settling time is 10ns.Clock offset: 2-1 = 1ns, data

. Moreover, this system is a network communication system that will be used for network transmission of a large number of images in the future. Therefore, RAM is also required to store image files. Figure 2 Reset Circuit RAM uses IS61LV51216 of ISSI, which has a storage capacity of KB × 16 bits, and a power supply voltage of V. The access speeds include 8ns, 10ns, 12ns, and 15ns. When the CPU runs at MHz, the minimum effective time of the address and

"advanced chipset features" item have a great impact on the acceleration of the host. Please pay attention to them. Change "Bank 0/1 DRAM timing" from "8ns/10ns" to "fast" or "Turbo ". "Turbo" is faster than "fast", but not stable. We recommend that you select "fast ". If the memory quality is good, you can select "Turbo". If the memory quality is unstable, you can change it back to "fast ". 　　 For memory-quality memory, we recommend that you set it

constraints are mainly used in the following situations:1. Frequent data exchange Due to the IO time series constraints, the computing values are generally several nanoseconds. When FPGA and external data exchange frequency is low, such as FPGA operating 640*480 tft LCD screen flushing, the data transmission frequency is only 24 MHz, each data clock has a 41.666ns, which can meet the timing requirements without any constraints. However, when the operation of SDRAM runs to M, because a data tran

shutdown speed is significantly faster. I. BIOS optimization settings On the home page of the BIOS settings, go to the "advanced BIOS features" option, move the cursor to the "frist boot device" option, and press "Pageup" and "Pagedown". The default value is "Floppy ", this indicates that the system will first read the startup information from the soft drive when it is started. This will prolong the start time of the machine and reduce the service life of the soft drive. So we want to select

"advanced chipset features" item have a great impact on the acceleration of the host. Please pay attention to them. Change "Bank 0/1 DRAM timing" from "8ns/10ns" to "fast" or "Turbo ". "Turbo" is faster than "fast", but not stable. We recommend that you select "fast ". If the memory quality is good, you can select "Turbo". If the memory quality is unstable, you can change it back to "fast ". For memory-quality memory, we recommend that you set it t

-capacity and refresh rate, the same size of memory with different refresh rate, will also use a different number. 64, 62, 63, 65, 66, 67, 6a represent 64mbit capacity, 28, 27, 2a capacity for 128mbit, 56, 55, 57, 5a on behalf of 256mbit capacity, 51 for 512mbit capacity. 6th, 7 digits-the number of data line pins, 08 for 8-bit data, 16 for 16-bit data, 32 for 32-bit data, 64 for 64-bit data. 11th Place--wired "-". 14th, 15 bits-the rate of the chip, such as 60 for 6ns;70 for 7ns;7b 7.5ns (cl

I. BIOS optimization settingsOn the BIOS settings homepage, go to the "advanced BIOS features" option and move the cursor to the "frist boot device" option,Select by "Pageup" and "Pagedown". The default value is "Floppy". This indicates that the system will first read the startup information from the soft drive.Extend the start time of the machine and shorten the life of the soft drive. So we want to select "HDD-0" directly from the hard disk boot, so that the boot will be faster than several se

I. BIOS optimization settingsOn the home page of the BIOS settings, go to the "advanced BIOS features" option, move the cursor to the "frist boot device" option, and press "Pageup" and "Pagedown". The default value is "Floppy ", this indicates that the system will first read the startup information from the soft drive when it is started. This will prolong the start time of the machine and reduce the service life of the soft drive. So we want to select "hdd-0" directly from the hard disk boot, so

I. BIOS optimization settings On the home page of the BIOS settings, go to the "advanced BIOS features" option, move the cursor to the "frist boot device" option, and press "Pageup" and "Pagedown". The default value is "Floppy ", this indicates that the system will first read the startup information from the soft drive when it is started. This will prolong the start time of the machine and reduce the service life of the soft drive. So we want to select "hdd-0" directly from the hard disk boot, s

"-".14th or 15 bits: the chip speed. For example, 60 is 6ns, 70 is 7ns, 7B is 7.5ns (CL = 3), 7C is 7.5ns (CL = 2), and 80 is 8ns; 10 is 10ns (66 MHz ).Knowing the meaning of the main digits of the memory Particle Code, it is very easy to calculate its capacity after getting a memory stick. For example, a samsung ddr memory is encapsulated with 18 SAMSUNG K4H280838B-TCB0 particles. Particle numbers 4th and 5 "28" indicate that the particles are 128 M

(INCR * orun+interval) so much time, we can understand that, at this time, the kernel thinks you want to get the timing time for the interval given timing time of the integer times, Then you know how many times overrun, this idea is not bad, but we bring into the actual value, it will feel more fun.Assume:Delta=5ns,interval=4nsTheLine 833 calculation result: orrun=1Line 834 adds 4ns to the original expires.Well, because line 835 at this time the condition will not be true so in:Line 841,orrun b

17th Chapter Routing Switch ProgrammingMTU = 64KB After all, it is ideal, it is difficult to achieve at this stage, involving more problems, synchronization with large networks, flow balance, time slot switching. So, APO still decides MTU = 48E = 1536B, including Head 2E, frame synchronization head 8 B, tail CRC 4B, etc. the valid contents of the packet (without the head) are 45E = 1440B. Head 2E = 64B, where Mac head 14B, IP head 18B, tcp/udp/icmp head 32B.The second layer switch is mainly desi

is enabled.The setting in "Advanced chipset features" has a great impact on the speed of the machine, please pay attention to it. Change "bank 0/1 DRAM Timing" from "8ns/10ns" to "fast" or "Turbo". "Turbo" faster than "fast", but not too stable, it is recommended to choose "Fast". If the memory quality is good can choose "Turbo" to try, instability can be changed back to "fast."For memory-quality memory chips, it is recommended that you set the "SDRA

" option, press "PageUP" and "PageDOWN" to choose, the default value is "floppy", This means that the system will first read the boot information from the floppy drive, which will increase the startup time of the machine and shorten the life of the floppy drive. so we have to choose "HDD-0" to boot directly from the hard drive, which starts up for several seconds. In addition, for the "Above 1MbMemoryTest" recommended in the BIOS setup, select "Disabled" for the "Quickpoweronselftest" recommend

the impact of very large, please pay more attention. Change the "Bank 0/1 DRAM Timing" from "8ns/10ns" to "Fast" or "Turbo". "Turbo" Faster than "fast", but not too stable, recommended "fast". If the memory quality good can choose "Turbo" try, instability can be changed back to "Fast." It is recommended that the memory-quality memory bar be set to "2" in the SDRAM CAS latency option, which can speed up. Newer motherboards support agp4x, if your video