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Old 4th October, 2001, 05:47 PM
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Question New Bus Type

Does anybody know where I can find a very descriptive review on the new bus types that are coming out shortly that will be replacing PCI?? Please let me know. I found it one day a few weeks ago when I was just messin around on the internet and now when my boss asks me to bring it up, again, I can't find it, so please help me out. Thanks!!
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Old 4th October, 2001, 06:07 PM
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You mean PCI-X???
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Old 4th October, 2001, 06:13 PM
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http://www.via.com.tw/jsp/en/vtf/pre...eilongchen.zip
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Old 4th October, 2001, 06:45 PM
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yeah, PCI-X is one of them, but there are about 2 or 3 other types of connections that are coming out within the next couple years that will be replacing, as far as I know, PCI and AGP and possibly EIDE, but we'll see.
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Old 4th October, 2001, 07:05 PM
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Well, I seem to remember reading something about an AGP 8x, I can't see how they could octo-pump a bus, so it's probably 133MHz quad-pumped.

ATA100, is to be replaced by ATA133 for a quick spell, then shortly after all current ATA standards will be wiped of the face of the earth with the up and coming SerialATA(which will have a small cable similar in size to a USB cable, and will be able to be run in 10ft lengths).

There are already those AMR ACR and CNR standards, but nobody likes them so there trash already.
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Old 4th October, 2001, 07:47 PM
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There's no problem pumping a bus at 8x base clock frequency. Just remember that it really needs to be a ^2 to make things easier on the hardware.

PCI-X would be a 64bit, single clocked 133MHz bus.

AMD has their HyperTransport Bus, which has a total bandwidth 6.4GB/sec bus, based around point-to-point unidirectional links. Basically, it's a point to point packetised bus. It's designed as an interconnect between core devices (Northbridge/Southbridge). It utilises multiple bus widths and low pin counts.

Intel have their InfiniBand bus, designed as an I/O bus, supporting channel-based links at 2.5Gbits/sec. Looks like it's a replacement for fibre channel and the like.

Intel also have 3GIO, which looks to be the long term replacement for PCI-X. 3GIO is a serial bus, designed to scale up to 10Gbit/sec. It supports multiple bus widths, and low pin counts (a la HyperTransport) Look at it as a high speed serial version of PCI, as it's designed to be software device driver compatible with PCI, as well as using the same PCI enumeration system.

That's all the technologies I could think of off the top of my head. I'm sure I've probably missed some!

AidanII
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Old 4th October, 2001, 07:50 PM
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Oh, I missed RapidIO. It seems to be designed as some form of system bus, scalable from 3Gbit/sec to 60Gbit/sec. Designed as an interconnect between devices, it is meant to take little sillicon and few pins.

Allegedly, it's possible to run PCI/PCI-X over RapidIO to allow for large numbers of PCI slots (>100!)

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Old 4th October, 2001, 09:50 PM
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Regular PCI won't be phased out for ever though. Just look at ISA. it's finally just about dead!
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Old 6th October, 2001, 02:28 AM
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Well at these speeds it won't be long before we all se cable @ 21mb sec lines as we now view 36.6 modems
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Old 16th October, 2001, 01:25 AM
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Really now, what is holding us back on the I/O front. I mean, why isn't there some kind of 512-bit 300mhz Quad data rate mainbus that everything plugs into. PCI is a long dead dinosaur that should have been put away many years ago. At least, the IDE bus needs to be thrown out and a totally discrete bus for storage needs to be implemented. Hard drive controllers on the PCI bus are SUPER WEAK.
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Old 16th October, 2001, 03:59 AM
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Quote:
Originally posted by AidanII
AMD has their HyperTransport Bus, which has a total bandwidth 6.4GB/sec bus, based around point-to-point unidirectional links. Basically, it's a point to point packetised bus. It's designed as an interconnect between core devices (Northbridge/Southbridge). It utilises multiple bus widths and low pin counts.
Don't forget V-link, which is a similar technology used by the latest VIA chipsets.

Both of these technologies are just a rip-offs of Intel's "hub architecture". The Idea is simple, the northbridge used to house the PCI controller, and the southbridge used to rest on the PCI bus. Now there is a new bus dedicated to communication between the north and southbridges, and the PCI controller has been moved to the southbridge. Basically everyone got off there lazy arses and did what should have been done when the 586 came out.
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Old 16th October, 2001, 04:04 AM
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Quote:
Originally posted by SJAXKINGPIN
Really now, what is holding us back on the I/O front. I mean, why isn't there some kind of 512-bit 300mhz Quad data rate mainbus that everything plugs into.
A 512-bit bus would have way too many circuit traces to be feasible, EVER. More realistically what will be needed is a 64-bit 133MHz octo-pumped bus. But PCI-X should be sufficient for about five or so years.
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Last edited by dimmreaper; 16th October, 2001 at 04:07 AM.
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Old 16th October, 2001, 06:29 AM
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Quote:
Originally posted by dimmreaper
A 512-bit bus would have way too many circuit traces to be feasible, EVER. More realistically what will be needed is a 64-bit 133MHz octo-pumped bus. But PCI-X should be sufficient for about five or so years.
which really means the next ten years..
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Old 16th October, 2001, 01:59 PM
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Quick breakdown of busses here, give in descending order... Note the step backwards from a 40MHz VESA local bus to PCI(!). Ok, so they're all very much total maximum throughputs that you'll never see in the real world!

Hypothetical busses

512-bit,300Mhz base clock, 4 phases/clock = ~72GB/sec
64-bit, 133Mhz base clock, 8 phases/clock = ~8GB/sec

Real world, here and now busses
Note how close RapidIO is to the theoretical 64Bit, 133Mhz, 8 pumped bus.
RapidIO = ~7.5GB/sec
HyperTransport = ~6.4GB/sec
3GIO = ~1.24GB/sec
PCI-X = ~1GB/sec
AGP4x = ~1GB/sec
PCI 64 = ~504MB/sec
AGP2x = ~503MB/sec
Firewire = ~400MB/sec
InfiniBand = 320MB/sec
AGP1x = ~252MB/sec
VLB(40Mhz)= 153MB/sec
PCI 32= ~126MB/sec
VLB(33Mhz) = ~126MB/sec
ISA = ~15MB/sec
100Mb Ethernet = 12.5MB/sec
USB1 = ~1.5MB/sec

Other busses
P4 (64bit,100Mhz base, 4phases) = ~3GB/sec
Athlon (64bit,133Mhz base, 2 phases) = ~2GB/sec
DDR= ~2GB/sec (totally invalid)
Athlon (64bit,100Mhz base, 2 phases) = ~1.5GB/sec
PC133 = ~1GB/sec (totally invalid)

Oh, we need FASTER memory as well. (;

AidanII

1GB=1024MB, 1MB=1024KB, 1KB=1024B
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Old 16th October, 2001, 06:44 PM
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hmm. pci is weak....I can't wait till pc 2700ddr comes out..
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