Interface controller using JTAG scan chain

Details Interface controller using JTAG scan chain Interface controller using JTAG scan chain

2006-07-18

2006-07-18

Cho, James H. (Department: 2819)

Electronic digital logic circuitry

With test facilitating feature

C326S037000, C714S724000

Reexamination Certificate

active

07078929

ABSTRACT:
In a programmable logic device system, including a programmable logic device, a configuration memory device, for storing configuration information, and a host computer system, for generating updated configuration information, the programmable logic device has a JTAG port, for connection to said host computer system, for receiving said updated configuration information, a JTAG port controller, operatively connected to the first JTAG port, and an SPI interface, for connection to said configuration memory device. The JTAG port controller comprises a scan chain, for controlling said SPI interface on the basis of information received from said host computer system. This allows a user of the host computer system to transfer updated configuration data to the configuration memory device by means of a connection from the host computer system to the JTAG port of the programmable logic device. Since the user will in any event require a connection from the host computer system to the JTAG port of the programmable logic device to allow testing of the device, this will avoid the need for the user to continually switch connections on the programmable logic device.

REFERENCES:
patent: 6754862 (2004-06-01), Hoyer et al.
patent: 6839873 (2005-01-01), Moore
patent: 6925583 (2005-08-01), Khu et al.

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