US5602494A
Expired / Lapsed
US
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Bi-directional programmable I/O cell
Assignee: Honeywell International Inc
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Filing: 1995-03-09
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Granted: 1997-02-11
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Expires: 2015-03-09
Abstract
Abstract A bi-directional programmable I/O cell is disclosed. The bi-directional programmable I/O cell has variable electrical characteristics which are selected via control inputs. The variable electrical characteristics can include a data transmission mode, an input bias impedance value and an input bias direction mode. The input bias direction mode has an independent submode and a dependent submode. The dependent submode can operate in a ring latch mode or an active termination mode. The independent submode is further comprised of a static submode and a dynamic submode. The static submode is further comprised of a pull-up mode and a pull-down mode. The bias impedance value is can be selected from a plurality of impedances. The bi-directional programmable I/O cell has a continuous or pulsed output in the data transmission mode.
Inventors
- 👤 Lance L. Sundstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:29
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/0175; H03K19/0185; H03K19/018592; H03K19/018585
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
89 words
A bi-directional programmable I/O cell connected between an interconnect and a core, comprising: a drive block connected to said interconnect, having at least one operating mode selected from a group of operating modes consisting of a data transmission mode, a bias impedance value mode and an impedance direction mode, each operating mode having a plurality of submodes; and a controller connected to said drive block, said interconnect, and said core in response to signals received from said core, activating a submode for each operating mode of said drive block.
Claim 2
Dependent Claim
89 words
A bi-directional programmable I/O cell connected between an interconnect and a core, comprising: a drive block connected to said interconnect, having at least one operating mode selected from a group of operating modes consisting of a data transmission mode, a bias impedance value mode and an impedance direction mode, each operating mode having a plurality of submodes; and a controller connected to said drive block, said interconnect, and said core in response to signals received from said core, activating a submode for each operating mode of said drive block.
Claim 3
Dependent Claim
31 words
A bi-directional programmable I/O cell as recited in claim 1, wherein said drive block bias impedance direction operating mode is comprised of an independent bias submode and a dependent bias submode.
Claim 4
Dependent Claim
28 words
A bi-directional programmable I/O cell as recited in claim 2, wherein said drive block independent bias submode is further comprised of a static submode and a dynamic submode.
Claim 5
Dependent Claim
25 words
A bi-directional programmable I/O cell as recited in claim 3, wherein said static submode is further comprised of a pull-up submode and a pull-down submode.
Claim 6
Dependent Claim
30 words
A bi-directional programmable I/O cell as recited in claim 2, wherein said drive block dependent bias submode is further comprised of a ring latch submode and an active termination submode.
Claim 7
Dependent Claim
30 words
A bi-directional programmable I/O cell as recited in claim 1, wherein said drive block data transmission mode is further comprised of a continuous transmission submode and a pulsed transmission submode.
Claim 8
Dependent Claim
37 words
A bi-directional programmable I/O cell as recited in claim 1, wherein said drive block impedance mode is further comprised of a 30-ohm impedance submode, a 50-ohm impedance submode, a 75-ohm impedance submode, and a high impedance submode.
Claim 9
Dependent Claim
55 words
A bi-directional programmable I/O cell connected between an interconnect and a core, comprising: a drive block connected to said interconnect, having variable electrical operating characteristics; and a controller connected to said drive block, said interconnect, and said core in response to signals received from said core, configuring the variable electrical characteristics of said drive block.
Claim 10
Dependent Claim
55 words
A bi-directional programmable I/O cell connected between an interconnect and a core, comprising: a drive block connected to said interconnect, having variable electrical operating characteristics; and a controller connected to said drive block, said interconnect, and said core in response to signals received from said core, configuring the variable electrical characteristics of said drive block.
Claim 11
Dependent Claim
107 words
A bi-directional programmable I/O cell connected between an interconnect having a signal and a core, comprising: a drive block connected to said interconnect, having variable electrical operating characteristics; and a controller connected to said drive block, said interconnect, and said core, said controller having two modes of operation selected in response to signals received from said core: (i) an input mode to provide the core with a signal from the interconnect and configure the variable electrical characteristics of said drive block and (ii) an output mode to configure the variable electrical characteristics of said drive block so that the interconnect is driven to a specific voltage level.
Claim 12
Dependent Claim
107 words
A bi-directional programmable I/O cell connected between an interconnect having a signal and a core, comprising: a drive block connected to said interconnect, having variable electrical operating characteristics; and a controller connected to said drive block, said interconnect, and said core, said controller having two modes of operation selected in response to signals received from said core: (i) an input mode to provide the core with a signal from the interconnect and configure the variable electrical characteristics of said drive block and (ii) an output mode to configure the variable electrical characteristics of said drive block so that the interconnect is driven to a specific voltage level.
Claim 13
Dependent Claim
75 words
A bi-directional programmable I/O cell connected between an interconnect and a core, comprising: a drive block connected to said interconnect, having a data transmission mode, a bias impedance value mode and an impedance direction mode, each operating mode having a plurality of submodes; and a controller connected to said drive block, said interconnect, and said core in response to signals received from said core, activating a submode for each operating mode of said drive block.
Claim 14
Dependent Claim
75 words
A bi-directional programmable I/O cell connected between an interconnect and a core, comprising: a drive block connected to said interconnect, having a data transmission mode, a bias impedance value mode and an impedance direction mode, each operating mode having a plurality of submodes; and a controller connected to said drive block, said interconnect, and said core in response to signals received from said core, activating a submode for each operating mode of said drive block.
Claim 15
Dependent Claim
31 words
A bi-directional programmable I/O cell as recited in claim 10, wherein said drive block bias impedance direction operating mode is comprised of an independent bias submode and a dependent bias submode.
Claim 16
Dependent Claim
28 words
A bi-directional programmable I/O cell as recited in claim 11, wherein said drive block independent bias submode is further comprised of a static submode and a dynamic submode.
Claim 17
Dependent Claim
25 words
A bi-directional programmable I/O cell as recited in claim 12, wherein said static submode is further comprised of a pull-up submode and a pull-down submode.
Claim 18
Dependent Claim
30 words
A bi-directional programmable I/O cell as recited in claim 11, wherein said drive block dependent bias submode is further comprised of a ring latch submode and an active termination submode.
Claim 19
Dependent Claim
30 words
A bi-directional programmable I/O cell as recited in claim 10, wherein said drive block data transmission mode is further comprised of a continuous transmission submode and a pulsed transmission submode.
Claim 20
Dependent Claim
37 words
A bi-directional programmable I/O cell as recited in claim 10, wherein said drive block impedance mode is further comprised of a 30-ohm impedance submode, a 50-ohm impedance submode, a 75-ohm impedance submode, and a high impedance submode.
Claim 21
Dependent Claim
69 words
A bi-directional programmable I/O cell connected between an interconnect and a core, comprising: a drive block connected to said interconnect, having two mutually exclusive operating modes, a pulsed transmission mode and a continuous transmission mode; and a controller connected to said drive block, said interconnect, and said core in response to signals received from said core, activating one of the two mutually exclusive operating modes of said drive block.
Claim 22
Dependent Claim
69 words
A bi-directional programmable I/O cell connected between an interconnect and a core, comprising: a drive block connected to said interconnect, having two mutually exclusive operating modes, a pulsed transmission mode and a continuous transmission mode; and a controller connected to said drive block, said interconnect, and said core in response to signals received from said core, activating one of the two mutually exclusive operating modes of said drive block.
Claim 23
Dependent Claim
77 words
A bi-directional programmable I/O cell connected between an interconnect and a core, comprising: a drive block connected to said interconnect, having four mutually exclusive operating modes, a 30-ohm impedance mode, a 50-ohm impedance mode, a 75-ohm impedance mode, and a high impedance mode; and a controller connected to said drive block, said interconnect, and said core in response to signals received from said core, activating one of the four mutually exclusive operating modes of said drive block.
Claim 24
Dependent Claim
77 words
A bi-directional programmable I/O cell connected between an interconnect and a core, comprising: a drive block connected to said interconnect, having four mutually exclusive operating modes, a 30-ohm impedance mode, a 50-ohm impedance mode, a 75-ohm impedance mode, and a high impedance mode; and a controller connected to said drive block, said interconnect, and said core in response to signals received from said core, activating one of the four mutually exclusive operating modes of said drive block.
Claim 25
Dependent Claim
69 words
A bi-directional programmable I/O cell connected between an interconnect and a core, comprising: a drive block connected to said interconnect, having two mutually exclusive operating modes, an independent bias mode and a dependent bias mode; and a controller connected to said drive block, said interconnect, and said core in response to signals received from said core, activating one of the two mutually exclusive operating modes of said drive block.
Claim 26
Dependent Claim
69 words
A bi-directional programmable I/O cell connected between an interconnect and a core, comprising: a drive block connected to said interconnect, having two mutually exclusive operating modes, an independent bias mode and a dependent bias mode; and a controller connected to said drive block, said interconnect, and said core in response to signals received from said core, activating one of the two mutually exclusive operating modes of said drive block.
Claim 27
Dependent Claim
28 words
A bi-directional programmable I/O cell as recited in claim 19, wherein said drive block independent bias mode is further comprised of a static submode and a dynamic submode.
Claim 28
Dependent Claim
25 words
A bi-directional programmable I/O cell as recited in claim 20, wherein said static submode is further comprised of a pull-up submode and a pull-down submode.
Claim 29
Dependent Claim
30 words
A bi-directional programmable I/O cell as recited in claim 19, wherein said drive block dependent bias mode is further comprised of a ring latch submode and an active termination submode.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-02-11 | 2000-08-12 | 2001-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-11 | 2004-08-12 | 2005-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-11 | 2008-08-12 | 2009-02-11 | $7700.00 | Window Closed / Lapsed |