Serial port controller for preventing repetitive interrupt signa

Details Serial port controller for preventing repetitive interrupt signa Serial port controller for preventing repetitive interrupt signa

1994-10-26

1998-02-10

Harrell., Robert B.

G06F 1324

Patent

active

057178704

ABSTRACT:
An improved input/output FIFO buffering device with expanded buffers for a universal asynchronous receiver/transmitter (UART) that includes scalable trigger levels for generation of an external service request is disclosed. Standard selectable trigger levels used in a type 16550 UART are provided as well as expanded scalable trigger levels to accommodate the larger buffers. The larger scalable trigger levels may be employed in a manner transparent to an application written for 16 byte buffers so as to physical accommodate higher data rates without requiring applications to know that more buffer space is used. A reinterruptable timer inhibits generation of an interrupt service request until a predetermined period of time after the most recent interrupt request has been serviced. The period of the timer is selectively programmable.

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