BRIDGE - Revision history

Skylark: added patent; clarified IP27/IP30 differences

2005-10-07T01:08:45Z

added patent; clarified IP27/IP30 differences

Skylark at 17:51, 10 August 2005

2005-08-10T17:51:48Z

Ralf at 17:45, 10 August 2005

2005-08-10T17:45:14Z

Ralf at 17:44, 10 August 2005

2005-08-10T17:44:55Z

New page

The '''BRIDGE''' [[Wikipedia:|Application-specific_integrated_circuit|ASIC]] is used as the [[Wikipedia:Peripheral_Component_Interconnect|PCI]] hostbridge in the SGI [[IP27]] family of machines. It interfaces between the internal Crosstalk connect one the one side and the 64-bit, 33MHz PCI bus on the other side. It supports 32-bit PCI cards by providing an address translation mechanism allowing 32-bit PCI cards to access the entire 64-bit address space of the system. BRIDGE also allows to specify a few attributes in 64-bit DMA addresses rsp. the address translation tables allowing to maximize performance.

== Linux support ==
Linux support BRIDGE but is currently limited to 64-bit cards only.

== Related patents ==
* [[uspto:5,915,104|US patent 5,915,104]]

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-The '''BRIDGE''' [[Wikipedia:Application-specific_integrated_circuit|ASIC]] is used as the [[Wikipedia:Peripheral_Component_Interconnect|PCI]] hostbridge in the SGI [[IP27]] family of machines, and also on SGI [[IP30]].  It interfaces between the internal Crosstalk connect one the one side and the 64-bit, 33MHz PCI bus on the other side.  It supports 32-bit PCI cards by providing an address translation mechanism allowing 32-bit PCI cards to access the entire 64-bit address space of the system.  BRIDGE also allows to specify a few attributes in 64-bit DMA addresses rsp. the address translation tables allowing to maximize performance.
+The '''BRIDGE''' [[Wikipedia:Application-specific_integrated_circuit|ASIC]] is used as the [[Wikipedia:Peripheral_Component_Interconnect|PCI]] hostbridge in the SGI [[IP27]] family of machines, and also on SGI [[IP30]].  It interfaces between the internal [[XIO]] connect one the one side and the 64-bit, 33MHz PCI bus on the other side.  It supports 32-bit PCI cards by providing an address translation mechanism allowing 32-bit PCI cards to access the entire 64-bit address space of the system.  BRIDGE also allows to specify a few attributes in 64-bit DMA addresses or the address translation tables allowing to maximize performance. (There is also a direct mapping mechanism to support 2GB of mappable space on 32-bit cards, and it has limited support for attributes in a per-BRIDGE configuration.)
 == Linux support ==
-Linux support BRIDGE but is currently limited to 64-bit cards only on [[IP27]]. There is no such limitation on [[IP30]].
+Linux supports BRIDGE but is currently limited to 64-bit cards. This limitation applies only on [[IP27]]; the IP30 is a smaller machine and therefore can efficiently use the 2GB direct mapping mechanism.
 == Related patents ==
-* [[uspto:5,915,104|US patent 5,915,104]]
+* [[uspto:5,915,104|US patent 5,915,104]], also [ftp://ftp.linux-mips.org/pub/linux/mips/people/skylark/pdf/bridge.pdf]

← Older revision		Revision as of 17:45, 10 August 2005
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−	The '''BRIDGE''' [[Wikipedia:\|Application-specific_integrated_circuit\|ASIC]] is used as the [[Wikipedia:Peripheral_Component_Interconnect\|PCI]] hostbridge in the SGI [[IP27]] family of machines. It interfaces between the internal Crosstalk connect one the one side and the 64-bit, 33MHz PCI bus on the other side. It supports 32-bit PCI cards by providing an address translation mechanism allowing 32-bit PCI cards to access the entire 64-bit address space of the system. BRIDGE also allows to specify a few attributes in 64-bit DMA addresses rsp. the address translation tables allowing to maximize performance.	+	The '''BRIDGE''' [[Wikipedia:Application-specific_integrated_circuit\|ASIC]] is used as the [[Wikipedia:Peripheral_Component_Interconnect\|PCI]] hostbridge in the SGI [[IP27]] family of machines. It interfaces between the internal Crosstalk connect one the one side and the 64-bit, 33MHz PCI bus on the other side. It supports 32-bit PCI cards by providing an address translation mechanism allowing 32-bit PCI cards to access the entire 64-bit address space of the system. BRIDGE also allows to specify a few attributes in 64-bit DMA addresses rsp. the address translation tables allowing to maximize performance.

	== Linux support ==		== Linux support ==