| 摘要 |
PROBLEM TO BE SOLVED: To provide a system and a method capable of easily loading a configuration code from a configuration system to EEPROMs even when the EEPROMs have a plurality of connected JTAG chains. SOLUTION: A method of performing in-system programming of the EEPROMs 208, 210, and 218 for holding the configuration code for a programmable logic device such as FPGAs 204, 206, and 207 is described. The method and the device are appropriate for use in a large system where all EEPROMs are not disposed in the same circuit boards 200 and 202. A plurality of serial buses 211 and 220 intrinsic to the boards and are connected to a header 224 having the EEPROMs 208, 210, and 210 of a specific board, a common configuration point having a selecting device 222, and a configuration device 230. The method comprises a step of setting a selecting device so as to select a specific bus, a step of erasing at least one EEPROM connected to the serial bus, and a step of writing the configuration code of the programmable logic device via the serial buses.
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