IPV4 is 32bit (4 times 8bit) rgds
The term "active low" means that the input on an IC requires a logic low for it to be activated, i.e a low voltage (of course the voltage range is dependent on the technology, TTL, CMOS etc) Active high is the opposite... the input requires a logic high for it to be activated. A simple example to illustrate, an 8bit counter can count UP/DOWN this functionality is controlled with only one pin, an active high on that pin to count up or low to count down.
Basically, these are the memory units used to represent the memory of the computing devices. Bit Byte (Contains 8 bits) Kilo-byte (Contains 1024 bytes) Mega-Byte (Contains 1024 kilo-bytes) Giga-Byte (Contains 1024 Mega-bytes) Tera-Byte (Contains 1024 Giga-bytes) and so on....
Figure 1 IPv4 Header Figure 2 IPv6 Header One feature of IPv6 that immediately comes to our mind is huge address space. This refers to the fact that, among many elements shown in Figure 1 and 2, the Source Address and the Destination Address has each been expanded from 32 bits to 128 bits. If you just think in terms of pure combination of numbers, there used to be 232 possible ways to represent addresses, but now there are 2128 possible ways to represent them. However, if you compare Figures 1 and 2 again, you will realize that although IPv6 uses four times more digits to express the addresses of the source and the destination, length of the header has not increased much from that of IPv4. This is because header format has been simplified in IPv6. You can see that among many elements (called "field") shown in Figure 1, those shown in red do not exist in Figure 2. One of the important changes is that there is no Options field in Figure 2. In IPv4, Options field can be used to add information about various optional services. For example, information related to encryption can be added here. Because of this, the length of the IPv4 header changes according to the situations. Due to this difference in length, routers that control communications according to the information in the IP header can't judge the length of the header just by looking at the beginning of the packet. This makes it difficult to speed up packet processing with hardware assist. On the other hand, IPv6 moves information related to additional services to a section called extension header. The part shown in Figure 2 is called basic header. Therefore, for plain packets, IP header length is fixed to 40 bytes. In terms of making it easier to process packets with hardware, you can say that IPv6 can be accelerated much easier than IPv4. Another field that exists in Figure 1 but is absent from Figure 2 is the Header Checksum field. A Header Checksum is a number used to check for errors in header information, and is calculated using the numbers in the header. However, problem with this approach is that header contains a number called TTL (Time To Live), which changes every time the packet goes through a router. Because of this, Header Checksum must be recalculated every time the packet goes through a router. If we can free up routers from this type of calculations, we could reduce the delay. Actually, TCP layer that resides above IP layer checks errors of various information including sender address and destination address. Since performing same calculations at the IP layer is redundant and unnecessary, Header Checksum is removed from IPv6. Figure 1 contains 8bit field called "Service Type". This field is used to represent the priority of the packet, for example whether it should be delivered express or with normal speed, and allows communication devices to handle the packet accordingly. Service Type field is composed of TOS (Type of Service) field and Precedence field. TOS field specifies the type of service and contains cost, reliability, throughput, delay, or security. Precedence field specifies the level of priority using eight levels from 0 to 7. IPv6 provides the same function with a field called Traffic Class. Flow Label field has a 20 bits length, and is a field newly established for IPv6. By using this field, packet's sender or intermediate devices can specify a series of packets, such as Voice over IP, as a flow, and request particular service for this flow. Even in the world of IPv4, some communication devices are equipped with the ability to recognize traffic flow and assign particular priority to each flow. However, these devices not only need to check the IP layer information such as address of the sender and the destination, but also need to check the port number which is an information that belongs to a higher layer. Flow Label field attempts to put together all these necessary information and provide them at the IP layer. However, specifics on how to use it is still undecided. As we have seen in this article, IPv6 aims to provide intelligent transmission framework that is easy to handle for intermediate devices by keeping the basic header simple and fixed length.
use two of them for 8 bits.
He does Let's Plays of Old and Recent 8bit and 32bit games.
32 bit
IPV4 is 32bit (4 times 8bit) rgds
so they fit correctly into an 8bit or 16bit slot
One bit is 2 possible colors, black, 8bit has a possible of 256
8bit = 1 byte1024byte = 1kb1,024kb = 1mb1,024mb = 1gb1,024gb = 1tb
1 byte = 8 bits. Computers only know two things. On (1) and off (0). This is known as binary. Computers use an 8bit binary system (00000000). The American Standrad Code for Information Interchange (ASCII) is an international code that notices that an 8bit character ASCI covers everything that you can type on a keyboard. Therefore a 1byte letter is A to Z.
This is the data bus width, it defines the largest size numbers the hardware can handle directly (0 .. 255 unsigned, -128 .. 127 signed).
web resolution : 72 pixels/inch color mode : RGB 8bit
character is an 8bit word also known as 1 byte. where as bit is referred to single bit among those 8 bit in a 1 byte (or character).
Suppose you want to add 11 and 12.instruction are : mvi a,11h mvi b ,12h mov d,b add b