Address-bus - Factbites

Address-bus - Factbites
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Topic: Address-bus

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	Bus switch coupling for series-coupled address bus sections in a microprocessor - Patent 4016546
		The first address bus section is further split by means of an address bus switch which controllably couples each conductor of the first address bus section to a corresponding conductor of a third address bus section.
		In extended addressing, the address contained in the second byte of the instruction is used as the higher eight-bits of the address of the operand.
		The bus control and coupling circuitry as recited in claim 2 further including preconditioning means coupled to each of said bus conductors of said second group and to said control means for presetting each of said bus conductors of said second group to a predetermined level under control of said control means.
	www.freepatentsonline.com /4016546.html (8512 words)

	Information about the computer BUS
		VLB 2.0 was later released in 1994 and had a 64-bit bus and a bus speed of 50 MHz.
		A computer bus is a method of transmitting data from one part of the computer to another part of the computer.
		When this bus was originally released it was a proprietary bus, which allowed only IBM to create peripherals and the actual interface.
	www.computerhope.com /help/bus.htm (1086 words)

	hardware.txt
		In particular it must move that data by putting address 50H into the MAR, the contents of AL into the MDR and waiting for memory to respond by copying the data from the data bus into the memory address specified on the address bus.
		The address bus usually has the same number of lines as there are bits in the computer's addresses.
		The default interpretation on the VAX is that this is an address.
	condor.depaul.edu /~glancast/343class/docs/hardware.txt (4498 words)

	isa_bus description
		The address and control signal decode logic provides the Read device select pulse signal (negative true) that determines when data from the IO device is passed to the ISA data bus to be read by the processor.
		Any IO device interfaced to the PC bus must decode an address, decide whether the address is originating from the host processor or a DMA device, determine the direction of data transfer and, if appropriate, either accept data or provide data at the proper time.
		ADDRESS Decoding - AEN and A0-A9 are used to decode a 10 bit ISA address generated by the processor.
	ece.wpi.edu /~wrm/Courses/EE3803/Labs/isa (836 words)

	Processor / Memory Address Bus
		The address bus is the set of lines that carry information about where in memory the data is to be transferred to or from.
		Address bus size is not something that is thought of very often, because it has no direct impact on performance.
		The speed of the address bus is the same as the data bus it is matched to.
	www.pcguide.com /ref/cpu/arch/extAddress-c.html (322 words)

	The Data Bus/Address Bus
		In the same way as an urban bus stops at various locations to pick up or drop off passengers, the computer's buses also have certain "bus stops" at which they call, and where addresses or data can hop on or be deposited.
		Source and destination addresses are sent over the address bus and specify a particular location in memory.
		The electrical bus inside the computer is the channel around which addresses and data travel.
	www.cs.ualberta.ca /~casey/c101/101notes/bus.html (319 words)

	PC bus systems
		Bus masters are devices capable of initiating any bus cycle (memory read/write, port addressing, etc.) and bus slaves are devices which are not capable of initiating a bus cycle but merely responding to it.
		This duplication was necessary because the address lines on the XT bus were latched (the address signals were tied to flip-flops which maintained the address lines logic level until explicitly set to a different value) and this latching process caused propagation delays that would slow down peripheral boards.
		The bus mastering was not a complete or perfect implementation due to certain limitations such as a request by a Bus master for 'Bus hand-off' requiring several cycles for completion and the master having to relinquish the bus periodically to allow memory refresh (or do the refresh itself).
	www.csn.ul.ie /~stephen/buses.html (7161 words)

	High-Tech Dictionary Definition
		Connections between the central processing unit (CPU) and memory which transmit the address from which the CPU will read, or to which the CPU will write.(The data is transmitted via the data bus.) The amount of memory the CPU can address is determined by the number of bits in the address bus.
	www.computeruser.com /resources/dictionary/definition.html?lookup=855 (52 words)

	' + pPage + '
		The address bus is used to indicate what address in memory or what address on the system bus are to be used in a data transfer operation.
		Although the design of the bus is simple, IBM waited until 1987 to publish full specifications for the timings of the data and address lines, so in the early days of PC compatibles, manufacturers had to do their best to figure out how to make adapter boards.
		This bus is either a part of the processor bus itself, or in most cases is implemented separately by a dedicated chipset that is responsible for transferring information between the processor bus and the memory bus.
	cma.zdnet.com /book/upgraderepair/ch05/ch05.htm (11750 words)

	Data and address bus on 52pin uPSD3234A40
		The P0 and P2 ports _are_ the address and data bus pins.
		The current board is with 8032 and PSD813 with address and data bus used to map display.
		I would like to implement data and address bus using the PLD logic.
	www.keil.com /discuss/docs/thread2386.htm (262 words)

	encoding_tr.doc
		While the encoding techniques for instruction address bus are based on the characteristics of sequential data, those for data address buses are based on the principle of locality of data addresses.
		This coding uses an extra bit line, an increment bit-line along with the address bus, which is set when the addresses on the bus are sequential, in which case the data on the address bus is not altered.
		Since addresses on the instruction address bus are sequential most of the time, we first analyze the characteristics of a completely sequential set of data.
	www.ics.uci.edu /~maheshmn/encoding_tr.doc (5926 words)

	Motorola 68000 Encyclopedia Article, Definition, History, Biography
		The Bus Error and Address Error instructions pushed a large amount of internal state onto the supervisor stack in order to facilitate recovery, and the MOVE from SR instruction was made privileged.
		When such code was executed on a machine with a wider address bus, bus errors resulted.
		Vectors 3 through 15 were used to report various errors: bus error, address error, illegal instruction, zero division, CHK and CHK2 vector, privilege violation, and some reserved vectors that became line 1010 emulator, line 1111 emulator, and hardware breakpoint.
	encyclopedia.localcolorart.com /encyclopedia/Motorola_68000 (2377 words)

	Fast Accurate Memory Test Suite - RAM, SRAM, DRAM, address bus, data bus
		That's because the address bus test assumes a working data bus, and the device test results are meaningless unless both the address and data buses are known to be good.
		By looking at the data value or address at which the test failed, he or she should be able to quickly isolate the problem on the circuit board.
		The address and data lines are used to select the memory location and to transfer the data, respectively.
	www.netrino.com /Articles/MemoryTesting (4125 words)

	Memory Bus
		The size of an address bus depends on the total size memory
		Normally a data bus is: 8, 16 or 32 bits wide depending on the processor.
		· This bus is used to transfer data between the processor and memory.
	www.qu.edu.qa /eng/503263/memory_bus.htm (170 words)

	Introduction to VME
		The address strobe (AS) is used to signal the presence of a valid address.
		VME bus was intended to be a flexible environment supporting a variety of computing intensive tasks, and has become a very popular protocol in the computer industry.
		The VME bus is a TTL based backplane which, although the system is asynchronous, sets the data transfer speed to approximately 20 Mbytes per second.
	www.lecroy.com /lrs/appnotes/introvme/introvme.htm (802 words)

	What is bus? - A Word Definition From the Webopedia Computer Dictionary
		The data bus transfers actual data whereas the address bus transfers information about where the data should go.
		This is a bus that connects all the internal computer components to the CPU and main memory.
		The local bus is a high-speed pathway that connects directly to the processor.
	www.webopedia.com /TERM/b/bus.html (656 words)

	Accessing the I/O bus and the address bus
		To access the memory address bus, the acfg should address the /dev/mem driver.
		However, acfg utilities are a special case and must be able to search the I/O and memory address space looking for hardware before the device driver has been linked into the UNIX kernel.
		To read from physical memory, open the device for reading, seek to the start address, and read the region into the user process from the file descriptor.
	docsrv.sco.com /HDK_mdi/acfg_iopl.html (198 words)

	CertiGuide to A+ (Core Hardware) - Address Bus
		The second piece of our memory bus that is responsible for addressing the individual cells (typically a cell is comprised of 4 bits of data) of RAM is known as the address bus.
		The width of the address bus defines how much memory the processor could potentially address.
		For example, if we had a 24-bit address bus (like in an Intel 80286 processor), the processor would have the ability to address 16 MB of RAM (2
	certiguide.com /aplush/cg_aph_AddressBus.htm (373 words)

	address bus
		The number of lines in the address bus determines the number of memory locations that the processor can access, because each line carries one bit of the address.
		A 20-line address bus (used in early Intel 8086/8088 processors) can access 1MB of memory, a 24-line address bus can access 16MB, and a 32-line address bus can access more than 4GB.
		The electronic channel, usually from 20 to 64 lines wide, used to transmit the signals that specify locations in memory.
	www.coffeycountyks.org /Terms/2461HTML-51.html (93 words)

	What is address bus? - A Word Definition From the Webopedia Computer Dictionary
		The width of the address bus (that is, the number of wires) determines how many unique memory locations can be addressed.
		A collection of wires connecting the CPU with main memory that is used to identify particular locations (addresses) in main memory.
		Modern PCs and Macintoshes have as many as 36 address lines, which enables them theoretically to access 64 GB (gigabytes) of main memory.
	www.webopedia.com /TERM/A/address_bus.html (335 words)

	Reducing Address Bus Transitions for Low Power Memory Mapping - Panda, Dutt (ResearchIndex)
		Our approach exploits this regularity in memory accesses by reducing the number of transitions on the memory address bus.
		30.5%: Low-Power Memory Mapping Through Reducing Address Bus Activity - Panda, Dutt (1999)
		Bus Energy Reduction by Transition Pattern Coding Using..
	citeseer.ist.psu.edu /panda96reducing.html (584 words)

	32-bit
		The external address and data buses are often wider than 32-bits but both of these are stored and manipulated internally in the processor as 32-bit quantities.
		For example, the Pentium Pro processor is a 32-bit machine, but the external address bus is 36-bits wide, and the external data bus is 64-bits wide.
		32-bit is a term applied to processors, and computer architectures which manipulate the address and data in 32-bit chunks.
	thedavidlawrenceshow.com /32bit_002375.html (243 words)

	Dictionary of Computers - address bus
		bus used to select the route for any particular data item as it is moved from one part of a computer to another.
		Blue and red acknowledge Andorra's links with France.
	www.tiscali.co.uk /reference/dictionaries/computers/data/m0034256.html (65 words)

	Memory address at opensource encyclopedia
		In order to access a particular memory location, the processor puts some signals on the address bus, which is typically 32-bits wide in most modern computers.
		A 32-bit wide address bus allows the processor to specify $2^{32}$ = 4,294,967,296 memory addresses.
		Each cell is uniquely identified by a number, or its memory address.
	wiki.tatet.com /Memory_address.html (188 words)

	Disk controller memory address register - Patent 4747038
		A disk controller address register is used to address both a disk controller memory and a system memory between which data is transferred as it is stored on or retrieved from a disk storage device.
		Main memory 4 signals disk controller 3 that the data word is available on data bus 8 via a second half bus cycle signal SHBC, a control bus 7, bus interface logic 9 and an acknowledge signal ACK which clocks the data word into data input register A 16 and data input register B 18.
		For the main memory 4 to data RAM 20 operation, address register 10 stores the address location of the two data bytes in main memory 4 which are to be stored in the same designated address locations in data RAM 20.
	www.freepatentsonline.com /4747038.html (4058 words)

	Harvest Memory Bus
		The large memory required the data bus 5 cycles after using the address bus and the fast memory required the data bus 4 cycles after using the address bus.
		If that box were not already occupied and the required future data bus slot was not already scheduled, then that client would bid for acquiring the address bus on the next cycle.
		Among the bidding clients the one with highest priority would be allocated the address bus and the future data bus cycle would be reserved.
	www.cap-lore.com /Hardware/HarvestMB.html (4058 words)

	RFC 2734 (rfc2734) - IPv4 over IEEE 1394
		SERIAL BUS ADDRESS RESOLUTION PROTOCOL (1394 ARP) Methods to determine the hardware address of a device from its corresponding IP address are inextricably tied to the transport medium utilized by the device.
		Within the 64-bit address, the 16-bit node ID (bus ID and physical ID) is analogous to a network hardware address---but 1394 node IDs are variable and subject to reassignment each time one or more nodes are added to or removed from the bus.
		Serial Bus is unique in its relevance to both consumer electronic and computer domains and is EXPECTED to form the basis of a home or small office network that combines both types of devices.
	www.faqs.org /rfcs/rfc2734.html (4058 words)

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