Patent US2368039A successfully refreshed from Google Patents.
Patent US5696949A successfully refreshed from Google Patents.
US5696949A
Expired / Lapsed
US
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System for PCI slots expansion using asynchronous PCI-to-PCI bridge with clock generator for providing clock signal to the expansion mother board and expansion side of bridge
Assignee: Intel Corp
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Filing: 1995-06-15
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Granted: 1997-12-09
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Expires: 2015-06-15
Abstract
Abstract An apparatus and method for providing PCI slot expansion. An asynchronous PCI to PCI bridge for insertion into a host PCI slot is coupled via a cabled PCI bus to an expansion module. The bridge establishes two distinct time domains. An expansion clock signal is generated and its timing matched for consistent arrival throughout the expansion clock domain. An expanded number of PCI slots are thereby available to the host system.
Inventors
- 👤 Bruce Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:35
CPC Classifications
G; G06; G06F; G06F13/00; G06F13/38; G06F13/40; G06F13/4004; G06F13/4027; G06F13/4045; G06F1/00; G06F1/04; G06F1/10; G06F2213/00; G06F2213/0024
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
79 words
An apparatus for providing PCI slot expansion comprising: an expansion card having disposed thereon an asynchronous PCI to PCI bridge with a host side and an expansion side for coupling to a host motherboard; an expansion motherboard having a plurality of PCI slots; a cabled PCI bus for coupling the expansion card to the expansion motherboard; a clock generator for providing a clock signal to the expansion motherboard and the expansion side of the asynchronous PCI to PCI bridge.
Claim 2
Independent Claim
79 words
An apparatus for providing PCI slot expansion comprising: an expansion card having disposed thereon an asynchronous PCI to PCI bridge with a host side and an expansion side for coupling to a host motherboard; an expansion motherboard having a plurality of PCI slots; a cabled PCI bus for coupling the expansion card to the expansion motherboard; a clock generator for providing a clock signal to the expansion motherboard and the expansion side of the asynchronous PCI to PCI bridge.
Claim 3
Dependent Claim
16 words
The apparatus of claim 1 wherein the clock generator is disposed on the expansion mother board.
Claim 4
Dependent Claim
14 words
The apparatus of claim 2 wherein the dock generator generates a 25 MHz signal.
Claim 5
Dependent Claim
31 words
The apparatus of claim 2 wherein the expansion mother board further comprises a secondary expansion bridge; and coupling the cabled signals to an expansion PCI bus having a plurality of slots.
Claim 6
Dependent Claim
29 words
The apparatus of claim 4 wherein the secondary expansion bridge further comprises an interrupt steering circuit and an I/O APIC; and the expansion card further comprises an APIC interface.
Claim 7
Dependent Claim
14 words
The apparatus of claim 1 wherein the asynchronous bridge is an intelligent I/O unit.
Claim 8
Dependent Claim
15 words
The apparatus of claim 4 wherein the secondary expansion bridge is an intelligent I/O unit.
Claim 9
Dependent Claim
99 words
A modular computer system providing an expanded number of PCI slots comprising: a host module having a host motherboard with a CPU disposed thereon; a PCI bus disposed on the host motherboard responsive to a host clock and having a plurality of host PCI slots; an expansion card for coupling to one of the plurality of host PCI slots; an expansion module having an expansion motherboard, the expansion motherboard having an expansion PCI bus with a plurality of expansion PCI slots responsive to an expansion clock signal; and a cabled PCI bus for connecting the host and expansion modules.
Claim 10
Dependent Claim
99 words
A modular computer system providing an expanded number of PCI slots comprising: a host module having a host motherboard with a CPU disposed thereon; a PCI bus disposed on the host motherboard responsive to a host clock and having a plurality of host PCI slots; an expansion card for coupling to one of the plurality of host PCI slots; an expansion module having an expansion motherboard, the expansion motherboard having an expansion PCI bus with a plurality of expansion PCI slots responsive to an expansion clock signal; and a cabled PCI bus for connecting the host and expansion modules.
Claim 11
Dependent Claim
58 words
The modular computer system of claim 8 further comprising a primary expansion bridge for providing an interface between the cabled bus and the host PCI bus; a secondary expansion bridge for providing an interface between the cabled bus and the expansion PCI bus; a clock generator disposed within the expansion module for generation of the expansion clock signal.
Claim 12
Dependent Claim
38 words
The modular computer system of claim 9 wherein the primary expansion bridge comprises an asynchronous PCI to PCI bridge and a demultiplexor; and the secondary expansion bridge comprises a PCI to PCI bridge and an interrupt steering unit.
Claim 13
Dependent Claim
15 words
The modular computer system of claim 9 wherein the expansion clock signal is 25 MHz.
Claim 14
Dependent Claim
24 words
The modular computer system of claim 9 wherein the cabled bus comprises a 100 conductor cable with a 100 pin connector at each end.
Claim 15
Dependent Claim
17 words
The modular computer system of claim 9 wherein the primary expansion bridge is an intelligent I/O unit.
Claim 16
Dependent Claim
29 words
The modular computer system of claim 10 wherein the primary expansion bridge further comprises: an APIC interface unit; and the secondary expansion bridge further comprises an I/O APIC unit.
Claim 17
Independent Claim
72 words
A method of providing modular expansion of PCI slots in a computer system comprising the steps of: installing an expansion card in a PCI slot of a host module; connecting the expansion card to an expansion module by a cable; generating an expansion clock signal independent of a host clock signal; segregating the host and expansion clock signals at the expansion card; and cabling PCI transmissions between the modules along the cable.
Claim 18
Independent Claim
72 words
A method of providing modular expansion of PCI slots in a computer system comprising the steps of: installing an expansion card in a PCI slot of a host module; connecting the expansion card to an expansion module by a cable; generating an expansion clock signal independent of a host clock signal; segregating the host and expansion clock signals at the expansion card; and cabling PCI transmissions between the modules along the cable.
Claim 19
Dependent Claim
18 words
The method of claim 15 wherein the segregating step is performed by an asynchronous PCI to PCI bridge.
Claim 20
Dependent Claim
30 words
The method of claim 15 wherein the step of generating further comprises the step of coordinating arrival of the expansion clock signal at a plurality of local and remote interfaces.
Claim 21
Dependent Claim
19 words
The method of claim 15 wherein the cable is terminated and operates as a point to point PCI bus.
Claim 22
Dependent Claim
37 words
The method of claim 17 further comprising providing an APIC bus interface on the expansion card; disposing an I/O APIC unit within the expansion module; passing interrupts generated in the expansion module to a host APIC bus.
Claim 23
Dependent Claim
14 words
The method of claim 15 wherein an intelligent I/O unit performs the segregating step.
Claim 24
Independent Claim
97 words
An apparatus for providing PCI slot expansion comprising: means for segregating a host and an expansion time domain for installing in a host system PCI slot; means for transmitting PCI signals over a predetermined distance; means for generating a clock signal for the expansion time domain; an expansion PCI bus responsive to the clock of the expansion time domain, said expansion bus having a plurality of PCI slots; wherein the means for transmitting more PCI signals from the expansion bus to the means for segregating, and the means for segregating passes the signals between the time domains.
Claim 25
Independent Claim
97 words
An apparatus for providing PCI slot expansion comprising: means for segregating a host and an expansion time domain for installing in a host system PCI slot; means for transmitting PCI signals over a predetermined distance; means for generating a clock signal for the expansion time domain; an expansion PCI bus responsive to the clock of the expansion time domain, said expansion bus having a plurality of PCI slots; wherein the means for transmitting more PCI signals from the expansion bus to the means for segregating, and the means for segregating passes the signals between the time domains.
References Cited (Backward Citations)
US4413319A
Cited
US4882702A
Cited
US5191657A
Cited
US5335329A
Cited
US5542055A
Cited
US5548730A
Cited
US5495569A
Cited
US5590377A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-12-08 | 2001-06-09 | 2001-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-08 | 2005-06-09 | 2005-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-12-08 | 2009-06-09 | 2009-12-09 | $7700.00 | Window Closed / Lapsed |