By Michael Gook
ISBN-10: 193176929X
ISBN-13: 9781931769297
Targeting the newest examine on interfaces utilized in smooth info know-how, this reference covers common exterior interfaces, peripheral equipment interfaces, exterior reminiscence interfaces, enlargement buses, instant interfaces, community interfaces, and auxiliary serial interfaces. particular applied sciences lined contain LPT, COM, USB, FireWire, SCSI, mouse, display screen, printer, audio and video interfaces, Serial ATA and flash playing cards, ISA, PCI, EISA, PC/104, AGP, LPC, PCMCIA, CardBus, Bluetooth, SPI, MII, SMI, JTAG, and Ethernet. additionally incorporated is info on sign line definitions and sign association on I/O connectors, time diagrams, adapters (ATA and NIC), controllers (DMA, PCI IDE, and FDC AT), interrupts, and multifunction playing cards.
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Additional info for PC Hardware Interfaces. Developer's Reference
Sample text
1. The interface makes it possible to exclude the remote communications channel along with a pair of DCE devices by connecting two devices directly using a null-modem cable (Fig. 2). 2: An RS-232C connection using a null-modem cable The standard specifies the control signals of the interface, data transfer, electrical interface, and connector 46 Chapter 2: Serial Interface—The COM Port Chapter 2: Serial Interface—The COM Port 47 types. The standard provides for asynchronous and synchronous transfer modes, but the COM ports only support asynchronous mode.
If the BIOS contains EPP functions, this call will return their entry point. 7) ♦ Interrupt Control—enabling and disabling interrupt use ♦ EPP Reset—resetting port ♦ Executing exchanges in the EPP mode: single address and data read/write cycles; data block input or output; combined operations (sending an address and inputting or outputting a byte or a data block) ♦ Lock/Unlock Port—selecting and Locking/Unlocking a device connected in chain or via a multiplexer ♦ Device Interrupt—installing interrupt handlers for the specified devices connected in chain or via a multiplexer.
Like the EPP protocol, this protocol provides high-performance bidirectional data exchange between a host and a peripheral device. The ECP provides two forward and reverse cycles: ♦ Data-read and -write cycles ♦ Command cycles The command cycles are subdivided into two types: channel-address transmission and Run-Length Count (RLC) transmission. Unlike the EPP, the standard on the software (register) implementation of the ECP adapter was introduced with the ECP protocol. It is described in the Microsoft document The IEEE 1284 Extended Capabilities Port Protocol and ISA Interface Standard This document defines protocol features not addressed by the IEEE 1284 protocol: ♦ Data compression by the host adapter using the Run-Length Encoding (RLE) method ♦ FIFO buffering for the forward and reverse channels ♦ DMA and programmed I/O usage The real-time RLE data-compression feature enables compression ratios up to 64:1 when transmitting raster images that have long strings of identical data.