Bus VESA

Occurrence of the local Bus was a first step to formation of architecture of the PC with the several Buss having different bandwidth. The local Bus did not replace with itself ISA or EISA, and supplemented them at the expense of several (no more than three) sockets of the local Bus. Originally these Buss were used for an exchange of the processor with the videoadapter for which any more there was no speed of job ISA (from here and the term — the local Bus, among present analogues to her is the closest AGP). And there were some various closed patented standards that constrained development of the local Bus. Therefore in August, 1992 association VESA (Video Electronics Standards Association), 100 companies representing more, has offered the specification of local Bus VLB (VESA Local Bus).

Bus VL-bus allows such peripheral devices as videoadapters and controllers of stores, to work with clock frequency up to 66 MHz. She represents the bidirectional 32-bit Bus of the data with theoretical bandwidth of 160 Mb per second (at frequency of the Bus of 50 MHz) and 107 Mb per second at frequency of 33 MHz.

VL-bus Is, as a matter of fact, expansion of the Bus of 80386 and 80486-th processor. As the devices connected to VL-bus, controllers of stores, videoadapters and network cards act. Structurally VL-bus represents a short socket such as MCA (112 contacts), established behind of sockets of expansion ISA or EISA. Thus 32 lines are used for data transfer and 30 — for transfer of the address. Standard VL-bus (version 2) provided use of the 64-digit Bus of the data and increase in quantity(amount) of sockets of expansion, however he and has not received distribution.

Epoch VL-bus has ended with leaving(care) from a stage of 486 processors. The matter is that VL-bus it is rigidly adhered to the Bus of the processor 80486 which differs from Buss Pentium and Pentium Pro (Pentium II), for which, basically, it is possible to construct Bus VL-bus with use of a microcircuit of the bridge (and such payments for first models Pentium really existed), however the overall performance of such payments was very low. Besides to quality of the signals transmitted on the Bus of the processor, rigid requirements, therefore instability of job of a VLB-payment easily are showed results in instability of all system. Besides the quantity(amount) of payments in system does not exceed two (a maximum, three) because of the limited loading ability of the local Bus of the processor { Pentium}

| הובלות | מחירון הובלות | לוח רכב | לוח רכב | לוח רכב | הובלות טיפים | הובלות דירות | טיפים הובלות | טיפים הובלות | הובלות הצעת מחיר | הובלות ולדימיר ירושלים | שיפוצים | חברת הובלות שינוע | חברת הובלות | גל הובלות הובלה | הובלות אינפו | הובלות ירושלים | מחירון הובלות דירות | חברות הובלה | לוח רכב יד שניה | מחירון הובלות | הובלות דירות | הובלות מחירון | הובלות - חברת הובלות | הובלות חיפה הובלות צפון | הובלות ירושלים