IA82510_11 Datasheet, PDF (23/25 Pages) InnovASIC, Inc – Asynchronous Serial Controller

IA82510
Asynchronous Serial Controller
Data Sheet
February 25, 2011
Errata No. 14
Problem: Unreliable transmits in AUTO TX mode.
Description: Many systems use the RTS output to activate the line transceiver. When the
Transmit Mode field in the TMD register is set to semi-auto or automatic mode, RTS is controlled
by the TX state machine. On the first character, RTS asserts at the same time as the start bit on
the TXD output, whereas the original Intel device asserts RTS a full bit time before assertion of
the start bit on TXD. At full temperature range, the width of the start bit can be altered to the
point of confusing the downstream receiver.
Workaround: Change firmware to Manual TX mode to control RTS vs. start of character.
®
IA211001219-05
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