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The PCI-X standard was developed jointly by IBM, HP, and Compaq and submitted for approval in 1998. It was an effort to codify proprietary server extensions to the PCI local bus to address several shortcomings in PCI, and increase performance of high bandwidth devices, such as Gigabit Ethernet, Fibre Channel, and Ultra3 SCSI cards, and allow processors to be interconnected in clusters.
ICH - 82801AA. The first version of the ICH was released in June 1999 along with the Intel 810 northbridge.While its predecessor, the PIIX, was connected to the northbridge through an internal PCI bus with a bandwidth of 133 MB/s, the ICH used a proprietary interface (called by Intel Hub Interface) that linked it to the northbridge through an 8-bit wide, 266 MB/s bus.
6U cards have an identical J1, a J2 that is always used for 64-bit PCI, as well as J3, J4, and J5 connectors for a variety of uses either as user-defined I/O or specified signaling such as Telephony and/or Ethernet signaling. Hot-plugging is a supported feature of CompactPCI.
Sbus 32-bit/25 MHz: 800 Mbit/s: 100 MB/s: 1989 DEC TURBOchannel 32-bit/25 MHz: 800 Mbit/s: 100 MB/s: Local Bus 98 32-bit/33 MHz: 1056 Mbit/s: 132 MB/s [35] VESA Local Bus (VLB) 32-bit/33 MHz: 1067 Mbit/s: 133.33 MB/s: 1992 PCI 32-bit/33 MHz: 1067 Mbit/s: 133.33 MB/s: 1993 HP GSC-1X: 1136 Mbit/s: 142 MB/s: Zorro III 32-bit/async (eq. 37.5 MHz ...
Memory-mapped I/O is preferred in IA-32 and x86-64 based architectures because the instructions that perform port-based I/O are limited to one register: EAX, AX, and AL are the only registers that data can be moved into or out of, and either a byte-sized immediate value in the instruction or a value in register DX determines which port is the source or destination port of the transfer.
32-bit and 64-bit PowerPC processors have been a favorite of embedded computer designers. To keep costs low on high-volume competitive products, the CPU core is usually bundled into a system-on-chip (SOC) integrated circuit.
The RapidIO architecture is a high-performance packet-switched electrical connection technology. It supports messaging, read/write and cache coherency semantics. Based on industry-standard electrical specifications such as those for Ethernet, RapidIO can be used as a chip-to-chip, board-to-board, and chassis-to-chassis interconnect.
Some of the disadvantages of the product were: Though the 80386 was a 32 bit CPU, it was limited to a 16-bit I/O bus in the case of the Intel Inboard 386/AT and an 8-bit I/O bus in the case of the Intel Inboard 386/PC. Both boards retained 32-bit data and address buses, however.
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