Boot mode selection through schmitt trigger

Oct 20, 2009 0 Replies

The link to the schematic is below. This is the extract from the reference schematic of one of the freescale's CPU.



formatting link



LCD_D00 to LCD_D04 are boot mode selection pins of the CPU. Why is the boot mode selection logic through Schmitt Trigger 74LVC2G17? Why can't we provide the boot mode select input like in the above two boxes (LCD_RS and LCD_D05) of the schematic.



TIA



-B


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