Q) Design 2-input OR gate Using NAND gates Only minimum anumber of 2-input

A NAND Gate a.Goes HIGH only when all inputs are HIGH b.Goes HIGH if one or the other inputs are HIGH but not both c.Goes HIGH if any input is HIGH d.Goes HIGH only when all inputs are LOW

What is the purpose of circuit 1 and 2 (highlighted)? How they work? Figure 13. Basic structure of a standard /O port bit Circuit 2 To on-chip peripheral Analog Input Altornate Function Input onvoff I Circuit 1 onlotf Read Voo TTL Schmitt trigger Protection diode on/off Input driver vo pin Write TOutput driver Voo A Protection diode P-MOS Output control Ves N-MOS Readwrite From on-chip peripheral Vss Push-pul, open-drain or deabled Circuit 2 Alternate Function Output ai14781 Bit setireset registers Output data register Input data register SK KH