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Self-adaptive adjustable ODT circuit applied to FPGA

A self-adaptive, circuit technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve problems such as resistance changes

Pending Publication Date: 2020-04-28
XIAN INTELLIGENCE SILICON TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually the matching impedance of the odt circuit will be affected by PVT (process error in the chip manufacturing process, application voltage factor and application temperature factor) and the voltage change of the interface transmission signal, resulting in a change in its resistance value. How to provide stable and accurate impedance matching Difficulties in becoming an ODT

Method used

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  • Self-adaptive adjustable ODT circuit applied to FPGA
  • Self-adaptive adjustable ODT circuit applied to FPGA
  • Self-adaptive adjustable ODT circuit applied to FPGA

Examples

Experimental program
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Embodiment 1

[0066] See figure 2 , figure 2 It is a block diagram of an adaptive and calibratable ODT circuit applied to FPGA provided by the embodiment of the present invention. As shown in the figure, the adaptive and calibratable ODT circuit applied to FPGA in this embodiment includes an ODT circuit module 1, a first calibration module 2 and a second calibration module 3, wherein the ODT circuit module 1 includes a first terminal resistance unit 101 and the second terminal resistance unit 102, wherein, the first terminal resistance unit 101 and the second terminal resistance unit 102 respond to the voltage change of the transmission signal, complete the adaptive adjustment and keep the impedance constant; the first calibration module 2 is connected to the first The terminal resistance unit 101 is used to calibrate the first terminal resistance unit 101; the second calibration module 3 is connected to the second terminal resistance unit 102 for calibrating the second terminal resistan...

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PUM

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Abstract

The invention relates to a self-adaptive adjustable ODT circuit applied to an FPGA. The circuit comprises an ODT circuit module, a first calibration module and a second calibration module. The ODT circuit module comprises a first terminal resistor unit and a second terminal resistor unit, and the first terminal resistor unit and the second terminal resistor unit respond to voltage changes of transmission signals to complete self-adaptive trimming and keep the impedances unchanged; the first calibration module is connected with the first terminal resistor unit and is used for calibrating the first terminal resistor unit; and the second calibration module is connected with the second terminal resistor unit and is used for calibrating the second terminal resistor unit. According to the self-adaptive adjustable ODT circuit applied to the FPGA, the terminal resistors of the arranged ODT circuit module can automatically adjust the circuit current when the swing amplitude of a transmitted signal is changed, so that the impedances of the terminal matching resistors are kept unchanged.

Description

technical field [0001] The invention belongs to the field of FPGA high-speed interface technology, and in particular relates to an adaptive and calibratable ODT circuit applied to FPGA. Background technique [0002] FPGA is a logic device composed of many logic units, including gates, look-up tables and flip-flops. It has rich hardware resources, powerful parallel processing capabilities and flexible reconfigurable capabilities. It is widely used in data processing, communication, and network. fields have been widely used. [0003] With the development of integrated circuits, the interface transmission speed is getting higher and higher. When the transmitter and receiver communicate at high speed, because the transmission line has characteristic impedance, a matching resistor equal to the characteristic impedance of the transmission line will be connected to the input end of the receiver side to reduce signal reflection and ensure signal transmission quality. The ODT (On D...

Claims

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Application Information

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IPC IPC(8): G05F3/26
CPCG05F3/26
Inventor 冯晓玲姬晶孟智凯贾红陈维新韦嶔程显志
Owner XIAN INTELLIGENCE SILICON TECH INC
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