Extended Memory Interconnect - Revision history

Jnc: More accurate new category

2024-05-07T23:43:19Z

More accurate new category

← Older revision		Revision as of 23:43, 7 May 2024
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	* [http://www.vaxhaven.com/images/f/fc/EK-650EB-UP-002.pdf EK-650EB-UP-002 VAX 6000 XMI Conversion Manual]		* [http://www.vaxhaven.com/images/f/fc/EK-650EB-UP-002.pdf EK-650EB-UP-002 VAX 6000 XMI Conversion Manual]

	[[Category: ~~DEC~~ Buses]]		[[Category: VAX Buses]]
	[[Category: XMI]]		[[Category: XMI]]
	~~[[Category: VAXen]]~~

Jnc: XMI bus systems are tightly-coupled multi-processors

2023-03-20T11:44:04Z

XMI bus systems are tightly-coupled multi-processors

← Older revision		Revision as of 11:44, 20 March 2023
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	[[File:VAX 6200 Four-Processor System Block Diagram.png\|thumb\|400px\|rightt\|A four-processor VAX 6200 system built around an XMI bus]]		[[File:VAX 6200 Four-Processor System Block Diagram.png\|thumb\|400px\|rightt\|A four-processor VAX 6200 system built around an XMI bus]]

	The '''Extended Memory Interconnect''' (usually given as the acronym: '''XMI''') was a [[bus]] introduced with the [[VAX 6000 series]], and also used in other later [[Digital Equipment Corporation\|DEC]] [[VAX]] computers, to cope with increased requirements, e.g bandwidth~~. It supports multiple processors, multiple memory modules, and multiple I/O adapters~~.		The '''Extended Memory Interconnect''' (usually given as the acronym: '''XMI''') was a [[bus]] introduced with the [[VAX 6000 series]], and also used in other later [[Digital Equipment Corporation\|DEC]] [[VAX]] computers, to cope with increased requirements, e.g bandwidth.

	The XMI is the primary interconnect for the [[VAX 6000 Model 200\|VAX 6200]] system (as shown to the side).:		It supports multiple processors, multiple [[main memory]] memory modules, and multiple I/O adapters; the overall system built around an XMI bus thus forms a tightly-coupled [[multi-processor]]. The bus has special capabilities to support the shared access to memory required by such a system.

			The XMI is the primary interconnect for the [[VAX 6000 Model 200\|VAX 6200]] system (as shown to the side).

	==Overview==		==Overview==

Jnc: better img loc

2023-03-19T20:04:19Z

better img loc

← Older revision		Revision as of 20:04, 19 March 2023
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			[[File:VAX 6200 Four-Processor System Block Diagram.png\|thumb\|400px\|rightt\|A four-processor VAX 6200 system built around an XMI bus]]

	The '''Extended Memory Interconnect''' (usually given as the acronym: '''XMI''') was a [[bus]] introduced with the [[VAX 6000 series]], and also used in other later [[Digital Equipment Corporation\|DEC]] [[VAX]] computers, to cope with increased requirements, e.g bandwidth. It supports multiple processors, multiple memory modules, and multiple I/O adapters.		The '''Extended Memory Interconnect''' (usually given as the acronym: '''XMI''') was a [[bus]] introduced with the [[VAX 6000 series]], and also used in other later [[Digital Equipment Corporation\|DEC]] [[VAX]] computers, to cope with increased requirements, e.g bandwidth. It supports multiple processors, multiple memory modules, and multiple I/O adapters.

			The XMI is the primary interconnect for the [[VAX 6000 Model 200\|VAX 6200]] system (as shown to the side).:

	==Overview==		==Overview==
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	It is also 'pended', which means that an operation can be left in an incomplete state, to allow other entities to use the bus, before resuming, and finishing. Several transactions can thus be in progress at any time, rather than forcing later operations to wait for the completion of an earlier operation before they can begin; this allows highly efficient use of the bus bandwidth.		It is also 'pended', which means that an operation can be left in an incomplete state, to allow other entities to use the bus, before resuming, and finishing. Several transactions can thus be in progress at any time, rather than forcing later operations to wait for the completion of an earlier operation before they can begin; this allows highly efficient use of the bus bandwidth.

	~~The XMI is the primary interconnect for the [[VAX 6000 Model 200\|VAX 6200]] system:~~

	~~[[File:VAX 6200 Four-Processor System Block Diagram.png\|thumb\|400px\|left\|A four-processor VAX 6200 system]]~~
	~~<br clear=all>~~

	The XMI supports:		The XMI supports:

Jnc: Copyedit

2023-03-19T06:19:08Z

Copyedit

← Older revision		Revision as of 06:19, 19 March 2023
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	The '''Extended Memory Interconnect''' (usually given as the acronym: '''XMI''') was a [[bus]] introduced with the [[VAX 6000 series]], and also used in later [[Digital Equipment Corporation\|DEC]] [[VAX]] computers, to cope with increased requirements, e.g bandwidth.		The '''Extended Memory Interconnect''' (usually given as the acronym: '''XMI''') was a [[bus]] introduced with the [[VAX 6000 series]], and also used in other later [[Digital Equipment Corporation\|DEC]] [[VAX]] computers, to cope with increased requirements, e.g bandwidth. It supports multiple processors, multiple memory modules, and multiple I/O adapters.

	==Overview==		==Overview==

	The XMI bus ~~supports multiple processors, multiple memory modules, and multiple I/O adapters. It consists of~~:		The constituent elements of the XMI bus are:

	* the electrical ~~environment~~ of the ~~XMI~~ bus,		* the [[analog]] electrical element of the bus,
	* the [[protocol]] observed by a node on the bus,		* the [[protocol]] observed by a node on the bus,
	* the [[backplane]], and		* the [[backplane]], and
	* the [[logic]] used to implement the protocol.		* the [[logic]] used to implement the protocol.

	The XMI is limited length, [[synchronous]], and has centralized [[arbitration]] (individual [[bus grant line]]s run from the arbitrator to each slot in the backplane). Arbitration and data transfers use logically separate divisions of the bus, so they can occur in parallel.		The XMI is of limited length, is [[synchronous]], and has centralized [[arbitration]] (individual [[bus grant line]]s run from the [[arbitrator]] to each slot in the backplane). Arbitration and data transfers use logically separate divisions of the bus, so they can occur in parallel.

	It is also 'pended', which means that an operation can be left in an incomplete state, to allow other entities to use the bus. Several transactions can thus be in progress at any time, rather than forcing later operations to wait for the completion of an earlier operation before they can begin; this allows highly efficient use of the bus bandwidth.		It is also 'pended', which means that an operation can be left in an incomplete state, to allow other entities to use the bus, before resuming, and finishing. Several transactions can thus be in progress at any time, rather than forcing later operations to wait for the completion of an earlier operation before they can begin; this allows highly efficient use of the bus bandwidth.

	The XMI is the primary interconnect for the [[VAX 6000 Model 200\|VAX 6200]] system.		The XMI is the primary interconnect for the [[VAX 6000 Model 200\|VAX 6200]] system:

	[[File:VAX 6200 Four-Processor System Block Diagram.png\|thumb\|400px\|left\|A four-processor VAX 6200 system]]		[[File:VAX 6200 Four-Processor System Block Diagram.png\|thumb\|400px\|left\|A four-processor VAX 6200 system]]
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	The longword operations implement byte and word modes required by certain I/O devices.		The longword operations implement byte and word modes required by certain I/O devices.

	~~The XMI~~ has a 64 ns bus cycle~~. It has~~ a bandwidth of 100 Mbytes per second; however, the usable bandwidth depends on transaction length:		It has a 64 ns bus cycle, and a bandwidth of 100 Mbytes per second; however, the usable bandwidth depends on transaction length:

	{\| class="wikitable"		{\| class="wikitable"
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	\|}		\|}

	==XMI ~~Versions~~==		==XMI versions==

	The XMI bus started with the "+5V '''XMI-1'''" version which was developed to the "+3.3V '''XMI-2'''" version later on.		The XMI bus started with the "+5V '''XMI-1'''" version, which was developed to the "+3.3V '''XMI-2'''" version later.

	There was an upgrade kit option H9657-CU ~~that~~ takes a VAX 6000 Model 200, 300, or 400 system with an XMI-1 power system and upgrades it to a VAX 6000 Model 500 with an XMI-2 power system. The upgrade adds +3.3 volt power, an XMI-2 backplane ~~preassembled~~ with bus bars and cables, and an H7206-B power and logic unit.		There was an upgrade kit, option H9657-CU, which takes a VAX 6000 Model 200, 300, or 400 system with an XMI-1 power system, and upgrades it to a VAX 6000 Model 500, with an XMI-2 power system. The upgrade adds +3.3 volt power, an XMI-2 backplane pre-assembled with bus bars and cables, and an H7206-B power and logic unit.

	{{semi-stub}}		{{semi-stub}}
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	==External links==		==External links==

	* [http://www.bitsavers.org/pdf/dec/vax/6200/EK-620AA-TM-001_Tech_May88.pdf VAX 6200 Technical User's Guide] (EK-620AA-TM-001) - the XMI is covered in Chapter 2, pp. 37-91 of the PDF		* [http://www.bitsavers.org/pdf/dec/vax/6200/EK-620AA-TM-001_Tech_May88.pdf VAX 6200 Technical User's Guide] (EK-620AA-TM-001) - the XMI is covered in Chapter 2 (pp. 37-91 of the PDF)
	* [http://www.vaxhaven.com/images/f/fc/EK-650EB-UP-002.pdf EK-650EB-UP-002 VAX 6000 XMI Conversion Manual]		* [http://www.vaxhaven.com/images/f/fc/EK-650EB-UP-002.pdf EK-650EB-UP-002 VAX 6000 XMI Conversion Manual]

Jnc: Improve description

2023-03-18T12:00:39Z

Improve description

← Older revision		Revision as of 12:00, 18 March 2023
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	The '''Extended Memory Interconnect''' (usually given as the acronym: '''XMI''') was a [[bus]] introduced with the [[VAX 6000 series]] of [[Digital Equipment Corporation\|DEC]] computers to cope with increased requirements, e.g bandwidth.		The '''Extended Memory Interconnect''' (usually given as the acronym: '''XMI''') was a [[bus]] introduced with the [[VAX 6000 series]], and also used in later [[Digital Equipment Corporation\|DEC]] [[VAX]] computers, to cope with increased requirements, e.g bandwidth.

	== ~~XMI~~ Overview ==		==Overview==
	~~The XMI is the primary interconnect for the [[VAX 6000 Model 200\|VAX 6200]] system. The XMI supports multiple processors, multiple memory modules, and multiple I/O adapters.~~

	~~Figure 2-1 shows a four-processor VAX 6200 system~~.		The XMI bus supports multiple processors, multiple memory modules, and multiple I/O adapters. It consists of:

	[[~~File:VAX 6200 Four-Processor System Block Diagram.png~~]]		* the electrical environment of the XMI bus,
			* the [[protocol]] observed by a node on the bus,
			* the [[backplane]], and
			* the [[logic]] used to implement the protocol.

	The XMI ~~consists of the electrical environment of the XMI~~ bus, the ~~protocol observed by a node on the bus,~~ the backplane, and the ~~logic used to implement the protocol~~.		The XMI is limited length, [[synchronous]], and has centralized [[arbitration]] (individual [[bus grant line]]s run from the arbitrator to each slot in the backplane). Arbitration and data transfers use logically separate divisions of the bus, so they can occur in parallel.

	~~The XMI bus~~ is ~~limited length~~, ~~pended~~, ~~and synchronous with centralized arbitration~~. Several transactions can be in progress at ~~a given~~ time, ~~allowing~~ highly efficient use of the bus bandwidth. ~~Arbitration and data transfers can occur simultaneously~~.		It is also 'pended', which means that an operation can be left in an incomplete state, to allow other entities to use the bus. Several transactions can thus be in progress at any time, rather than forcing later operations to wait for the completion of an earlier operation before they can begin; this allows highly efficient use of the bus bandwidth.

			The XMI is the primary interconnect for the [[VAX 6000 Model 200\|VAX 6200]] system.

			[[File:VAX 6200 Four-Processor System Block Diagram.png\|thumb\|400px\|left\|A four-processor VAX 6200 system]]
			<br clear=all>

			The XMI supports:

	~~The bus supports:~~
	* Quadword-, octaword-, and hexword-length reads to memory		* Quadword-, octaword-, and hexword-length reads to memory
	* Quadword- and octaword-length memory writes		* Quadword- and octaword-length memory writes
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	The longword operations implement byte and word modes required by certain I/O devices.		The longword operations implement byte and word modes required by certain I/O devices.

	The XMI has a 64 ns bus cycle.		The XMI has a 64 ns bus cycle. It has a bandwidth of 100 Mbytes per second; however, the usable bandwidth depends on transaction length:

	~~The XMI~~ has a bandwidth of 100 Mbytes per second; however, the usable bandwidth depends on transaction length:

	{\| class="wikitable"		{\| class="wikitable"
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	\|}		\|}

	== XMI Versions ==		==XMI Versions==

	The XMI bus started with the "+5V '''XMI-1'''" version which was developed to the "+3.3V '''XMI-2'''" version later on.		The XMI bus started with the "+5V '''XMI-1'''" version which was developed to the "+3.3V '''XMI-2'''" version later on.

	There was an upgrade kit option H9657-CU that takes a VAX 6000 Model 200, 300, or 400 system with an XMI-1 power system and upgrades it to a VAX 6000 Model 500 with an XMI-2 power system.		There was an upgrade kit option H9657-CU that takes a VAX 6000 Model 200, 300, or 400 system with an XMI-1 power system and upgrades it to a VAX 6000 Model 500 with an XMI-2 power system. The upgrade adds +3.3 volt power, an XMI-2 backplane preassembled with bus bars and cables, and an H7206-B power and logic unit.

	The upgrade adds +3.3 volt power, an XMI-2 [[backplane]] preassembled with bus bars and cables, and an H7206-B power and logic unit.

	~~The manual [http://www.vaxhaven.com/images/f/fc/EK-650EB-UP-002.pdf EK-650EB-UP-002 VAX 6000 XMI Conversion Manual] describes the upgrade procedure~~.

	{{semi-stub}}		{{semi-stub}}
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	* [http://www.bitsavers.org/pdf/dec/vax/6200/EK-620AA-TM-001_Tech_May88.pdf VAX 6200 Technical User's Guide] (EK-620AA-TM-001) - the XMI is covered in Chapter 2, pp. 37-91 of the PDF		* [http://www.bitsavers.org/pdf/dec/vax/6200/EK-620AA-TM-001_Tech_May88.pdf VAX 6200 Technical User's Guide] (EK-620AA-TM-001) - the XMI is covered in Chapter 2, pp. 37-91 of the PDF
			* [http://www.vaxhaven.com/images/f/fc/EK-650EB-UP-002.pdf EK-650EB-UP-002 VAX 6000 XMI Conversion Manual]

	[[Category: DEC Buses]]		[[Category: DEC Buses]]
	[[Category: XMI]]		[[Category: XMI]]
	[[Category: VAXen]]		[[Category: VAXen]]

Jnc: +cat, for finding

2023-03-17T11:44:46Z

+cat, for finding

← Older revision		Revision as of 11:44, 17 March 2023
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	[[Category: DEC Buses]]		[[Category: DEC Buses]]
	[[Category: XMI]]		[[Category: XMI]]
			[[Category: VAXen]]

Jnc: /* External links */ +manual

2022-07-17T19:53:37Z

External links: +manual

← Older revision		Revision as of 19:53, 17 July 2022
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	The Extended Memory Interconnect (acronym: XMI) was a bus introduced with the [[VAX 6000 series]] of [[Digital Equipment Corporation\|DEC]] computers to cope with increased requirements, e.g bandwidth.		The '''Extended Memory Interconnect''' (usually given as the acronym: '''XMI''') was a [[bus]] introduced with the [[VAX 6000 series]] of [[Digital Equipment Corporation\|DEC]] computers to cope with increased requirements, e.g bandwidth.

	== XMI Overview ==		== XMI Overview ==
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	{{semi-stub}}		{{semi-stub}}

			==External links==

			* [http://www.bitsavers.org/pdf/dec/vax/6200/EK-620AA-TM-001_Tech_May88.pdf VAX 6200 Technical User's Guide] (EK-620AA-TM-001) - the XMI is covered in Chapter 2, pp. 37-91 of the PDF

	[[Category: DEC Buses]]		[[Category: DEC Buses]]
	[[Category: XMI]]		[[Category: XMI]]

Vaxorcist: Added some details

2022-07-17T11:35:47Z

Added some details

@@ Line 1: / Line 1: @@
 The Extended Memory Interconnect (acronym: XMI) was a bus introduced with the [[VAX 6000 series]] of [[Digital Equipment Corporation|DEC]] computers to cope with increased requirements, e.g bandwidth.
 The XMI bus started with the "+5V '''XMI-1'''" version which was developed to the "+3.3V '''XMI-2'''" version later on.
@@ Line 7: / Line 50: @@
 The upgrade adds +3.3 volt power, an XMI-2 [[backplane]] preassembled with bus bars and cables, and an H7206-B power and logic unit.
-[http://www.vaxhaven.com/images/f/fc/EK-650EB-UP-002.pdf EK-650EB-UP-002 VAX 6000 XMI Conversion Manual] describes the upgrade procedure.
+The manual [http://www.vaxhaven.com/images/f/fc/EK-650EB-UP-002.pdf EK-650EB-UP-002 VAX 6000 XMI Conversion Manual] describes the upgrade procedure.
-{{stub}}
+{{semi-stub}}
 [[Category: DEC Buses]]
 [[Category: XMI]]

Vaxorcist: Added some more details

2022-07-17T11:10:11Z

Added some more details

← Older revision		Revision as of 11:10, 17 July 2022
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	The Extended Memory Interconnect (acronym: XMI) was a bus introduced with the VAX 6000 series of DEC computers to cope with increased requirements, e.g bandwidth.		The Extended Memory Interconnect (acronym: XMI) was a bus introduced with the [[VAX 6000 series]] of [[Digital Equipment Corporation\|DEC]] computers to cope with increased requirements, e.g bandwidth.

	The XMI bus started with the "+5V '''XMI-1'''" version which was developed to the "+3.3V '''XMI-2'''" version ~~lateron~~.		The XMI bus started with the "+5V '''XMI-1'''" version which was developed to the "+3.3V '''XMI-2'''" version later on.

			There was an upgrade kit option H9657-CU that takes a VAX 6000 Model 200, 300, or 400 system with an XMI-1 power system and upgrades it to a VAX 6000 Model 500 with an XMI-2 power system.

			The upgrade adds +3.3 volt power, an XMI-2 [[backplane]] preassembled with bus bars and cables, and an H7206-B power and logic unit.

			[http://www.vaxhaven.com/images/f/fc/EK-650EB-UP-002.pdf EK-650EB-UP-002 VAX 6000 XMI Conversion Manual] describes the upgrade procedure.

	{{stub}}		{{stub}}

Vaxorcist: New page

2022-07-17T10:02:55Z

New page

New page

The Extended Memory Interconnect (acronym: XMI) was a bus introduced with the VAX 6000 series of DEC computers to cope with increased requirements, e.g bandwidth.

The XMI bus started with the "+5V '''XMI-1'''" version which was developed to the "+3.3V '''XMI-2'''" version lateron.

{{stub}}

[[Category: DEC Buses]]
[[Category: XMI]]