REQUIREMENTS

RQ.01: The format shall include an 8-bit address byte, containing the address of the destination node, followed by a 12-bit data byte.

RQ.02-1: If the MSB of the address byte is HIGH, the transmission shall end following the transmission of the 12-bit data word (write operation). The receive device will then act on the contents of the data word.

RQ.02-2: If the MSB of the address byte is LOW, the 12-bit data byte shall contain the location of an address to read from in the device addressed in the 8-bit address byte. This will then be followed by an 8-bit response from the addressed device with the memory contents contained at that address.

RQ.03: The system is synchronous, therefore no start or stop bits are required. Additionally, no parity is included.

PROBLEMS

Q1:

Assume that node A wishes to command node B to turn on an LED. Node Bs address is 0x19, and the command to turn on the desired LED is 0x111. Show a timing diagram of the bits transmitted, assuming a 2-bit hold at HIGH between the address and data words, and no additional start or stop bits. Additionally, assume that the data is transmitted Least Significant Bit first.

Q 2:

Provide an example sequence of a node A requesting node B, located at address 0x12, to send the data located in Bs memory location 0x418. Assume the data value at that location is 0xFA. Your answer should contain an ordered list of each value transmitted, and the direction of transmission for each step.