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1. 发明授权

US07454535B2 Bidirectional data repeater switch 有权
标题翻译：双向数据中继器开关
公开(公告)号：US07454535B2
公开(公告)日：2008-11-18
申请号：US11745539
申请日：2007-05-08
申请人： Julie A Hwang , Woo Jin Kim , Alan S Bass , Mark W Morgan
发明人： Julie A Hwang , Woo Jin Kim , Alan S Bass , Mark W Morgan
IPC分类号： G06F3/00 , G06F5/00
CPC分类号： H03K19/0185
摘要： A bidirectional repeater and data multiplexer for serial data has A-side I2C port devices A1-A4 coupled to comparators 302-308 and pulldowns to ground 316-322. Comparator outputs are coupled responsive to select lines S1-S4 of N:l Select 310 to terminal A1 of bidirectional control 210 to control pulldown to non-zero low voltage Vp 206 at B-side device B. An inverting comparator 208 coupled to terminal B1 of bidirectional control 210 responds to input threshold voltage Vt less than low voltage Vp, to prevent data lockup due to data flowback to devices A1-A4. Output data from comparator 208 is coupled responsive to select lines S1-S4 of 1:N Select 312 to control pulldowns 316-322. This selectively repeats routing of device A1-A4 data to device B. Data from device B is selectively routed to pulldowns of devices A1-A4.
摘要翻译：用于串行数据的双向中继器和数据多路复用器具有耦合到比较器302-308并且下拉到地316-322的A侧I2C端口设备A 1 -A 4。响应于N：1的选择线S 1 -S 4耦合比较器输出。选择310到双向控制210的端子A 1，以控制在B侧装置B处的下拉到非零低电压Vp 206.反相比较器208耦合到双向控制器210的端子B1响应小于低电压Vp的输入阈值电压Vt，以防止由于数据回流到设备A 1 -A 4而导致的数据锁定。来自比较器208的输出数据响应于1：N选择312的选择线S 1 -S 4而耦合以控制下拉316-322。这选择性地重复设备A 1 -A 4数据到设备B的路由。来自设备B的数据被选择性地路由到设备A 1 -A 4的下拉。

2. 发明申请

US20080001625A1 BIDIRECTIONAL DATA REPEATER SWITCH 有权
公开(公告)号：US20080001625A1
公开(公告)日：2008-01-03
申请号：US11745539
申请日：2007-05-08
申请人： Julie A. Hwang , Woo Jin Kim , Alan S. Bass , Mark W. Morgan
发明人： Julie A. Hwang , Woo Jin Kim , Alan S. Bass , Mark W. Morgan
IPC分类号： H03K19/003
CPC分类号： H03K19/0185
摘要： A bidirectional repeater and data multiplexer for serial data comprises a plurality of comparators 302, 304, 306, 308 coupled to the respective input/output (I/O) terminals of a plurality of serial data transceiver devices A1, A2, A3, A4 such as used in I2C communication. Also coupled to these I/O terminals is a plurality of active pulldowns 316, 318, 320, 322. The outputs of the comparators are coupled to N:1 Select 310 logic wherein the desired data input is selected responsive to select lines S1, S2, S3, S4. The output of the N:1 select logic is coupled to a bidirectional control circuit 210, which couples the selected data to the control terminal of an active pulldown 206 having its source coupled to a pulldown voltage Vp low enough to represent a logic “low” level but non-zero, and a drain connected to the I/O terminal of a device B. Also connected to the I/O terminal of device B is an inverting comparator having a threshold voltage Vt somewhat below the pulldown voltage Vp described above, such that the comparator ignores the low level Vp of the active pulldown, but responds to the less than Vp data zero level from device B. This prevents data lockup where data from An would flow back to the same device An. The data output of comparator 208 is thus a repeated version of data present on the I/O terminal of device B, and is coupled through 1:N Select 312 logic, responsive to the same select lines S1 . . . described above, to one of the plurality of active pulldowns 316, 318, 320, 322. Data from device An, one of the plurality of devices A1 . . . A4, is thus repeated and selectively routed to device B. Similarly, data from device B is selectively routed to the active pulldown coupled to the same device An. Pulldown voltages Vp and threshold voltages Vt may be varied to optimize coupling with device B, as long as the pulldown voltage Vp remains above the threshold voltage Vt; the pulldown and threshold voltages may be selected from a plurality of such pulldown and threshold voltages, in order to optimize noise margins when coupling to devices having different Vil and Vol specifications.

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