IA82510_11 Datasheet, PDF (21/25 Pages) InnovASIC, Inc – Asynchronous Serial Controller

IA82510
Asynchronous Serial Controller
Data Sheet
February 25, 2011
Errata No. 7
Problem: Difficulty starting oscillator with crystal.
Description: No internal feedback resistor between X1 and X2.
Workaround: Install external 1-10Mohm resistor.
Errata No. 8
Problem: Intermittent and temperature sensitive crystal oscillator operation when cycling power.
Description: Strapping state elements apparently transparent latches instead of flip flops. If flip
flop powers up to wrong state, crystal oscillator is disabled while reset is active. OK after first
reset following power-up.
Workaround: None.
Errata No. 9
Problem: Auto-acknowledge of interrupts via writing of LSR does not work.
Description: Writing LSR directly sets/resets bits 4 through 0. Also writing 0 to LSR(0) – RX
FIFO – clears the RX FIFO level as seen by FLR. Writing zero to any other LSR bits clears the
corresponding LSR/RST flag, but also corrupts the FIFO location the write pointer is set to, then
increments both the write and read pointers.
Workaround: Use other means to service interrupts, such as read of RST or RXD.
Errata No. 10
Problem: ICM Status Clear command does not clear LSR/RST overrun error.
Description: ICM Status Clear command should clear everything in RST/LSR, MSR, and TMST
except RST/LSR(0). Overrun error was missed.
Workaround: Use other means to service interrupts.
®
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