LC823450 Datasheet, PDF (24/55 Pages) ON Semiconductor – Low Power & High-Resolution Audio Processing System LSI

LC823450
2-3 SDIF PullUp
In case of boot mode using SDIF port, internal PullUp resistor is used (SDCMD0, SDAT0[3:0] / SDCMD1, SDAT1[3:0]). So,
external PullUp resistor is not required on board.
2-4 QSCS PullUp
In case of boot mode using QSCS, PullUp of GPIO03(QSCS) is active by the hard reset. After GPIO2E is set to high,
GPIO03 set to QSCS and PullUp set to inactive.
In case of Hi-z boot, PullUp is forced to inactive
2-5 GPIO2F
During boot, GPIO2F is used as GPIO and indicates boot status and error occurrence by output of Low/High.
When errors occur during boot sequences, for example writing of IPL2, GPIO2F reports the sort of error. GPIO0F can
indicate the status of USB connection and the completion of USB file transfer. And Delete Mode, completion of Erase, and
status of Erase can be reported by sequence of Low/High.
For more detail about the behavior of ports used during boot, refer to the document LC823450 Series IPL specification.
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