Exercise $1$

a$.$ Draw the wiring diagram to connect SCI$0$ of one DP$512($a producer$)$ to SCII of another DP$512($a

consumer$).$ Specify the name of the pins$/$ports that you should use for the SCI communication.

b$.$ Let $r_p$ be the baud rate for the SCI at the producer and $r_g$ be the baud rate for the SCI at the

consumer. What problem could happen if temporarily we had $r_p=9600bps$ and $r_g=4800bps?$

What do we need in this case to handle this problem?

Let us assume that we have N frames that need to be sent by the producer to the consumer. Assume that a

frame contains $8-$bit data, $1$ start bit and $1$ stop bit.

c$.$ Calculate the time needed to transmit one bit by the producer.

d$.$ Calculate the time needed to transmit a frame by the producer.

e$.$ Assume that the consumer installed an Rx First$-$Input First$-$Output $($FIFO$)$ buffer that can handle

data received at high speeds. The consumer is processing this data in some long$-$term simulation

that requires a x$=5$ ms to take out a received frame from the Rx First$-$Input First$-$Output $($FIFO$)$

buffer. If the producer transmits data for $1$ second, what should be the minimum size for this FIFO

buffer RXLEN to prevent data overrun?

f$.$ Provide the code to initialize the SCI to receive only $($i$.$e$.$ transmitter off$)$ at $4800$ bits$/$s with $8-$bit

data frame and odd parity assuming a ECLK of $16$ MHz$.$

g$.$ How many pointers do we need to track the status of the Rx FIFO buffer? Find an expression in $$C$$

in terms of the RX buffer length RXLEN and the pointers to determine if the buffer is full.