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Flow control can prevent data loss from buffer overflow. When sending data, if the receiving
buffers are full, a 'stop' signal can be sent to stop the data flow. Once the buffers are empty, a
'start' signal can be sent to re-start the flow. Hardware flow control uses two wires to send
start/stop signals.
Data Bits
Data Bits
Parity
A parity bit can be sent with the data bits to detect some transmission errors. Even: parity bit is
0 if the num of 1's in the data bits is even. Odd: parity bit is 0 if num of 1's in the data bits is
odd. Mark: parity bit is always 1. Space: Parity bit is always 0. Mark and Space Parity do not
allow for error detection.
Stop Bits
Stop bits indicate the end of a serial data packet. ( A start bit indicates the beginning). The
standard setting is 1 stop bit. Communication with slow devices may require more than 1 stop
bit.
Chapter 3 – AMI BIOS Setup
7
8
None
Even
Odd
Mark
Space
1
2
54
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