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TPMC632 User Manual Issue 1.0.6
Page 41 of 49
8 Known Issues
Level Switching at TPMC632 I/O Lines during FPGA Configuration.
At power-up or after a FPGA reconfiguration is started, the FPGA need up to 10ms to start configuration.
During this time, the I/O lines of the TPMC632 may randomly toggle between high and low in case that I/O
Line 19 of the TPMC632 (X1 pin 45 resp. P14 pin 20) is low.
As long as the TPMC632 is used with J1 configured as a Pull-up and I/O Line 19 is not connected to GND or
driven low externally, this issue does not occur.
To avoid this issue, the TPMC632-xxR I/O Line 19 should have a minimum of +2V DC (lower limit of TTL
high level) during FPGA configuration.