; $URL: http://subversion:8080/svn/gsc/trunk/drivers/LINUX/SIO4%20and%20SIO8/SIO4_Linux_2.x.x_GSC_DN/hdlc/samples/hdlcc2c/readme.txt $
; $Rev: 56574 $
; $Date: 2025-08-06 08:52:00 -0500 (Wed, 06 Aug 2025) $

SIO4: HDLC Protocol Library: Sample Application: instructions



1. SIO4_HDLC_RX_STAT_R_RCCF_OVER Errors

This error occurs when an Rx Frame record is lost due to the USC's internal
RCC FIFO experiencing an overflow. This FIFO has only four entries. So, what
this error really means is that the driver wasn't able to service interrupts
fast enough. This can happen if the host has too many other tasks to service
including other interrupts. This situation is more likely to occur with small
HDLC Frames and high bit rates. To prevent this error with the hdlcc2c
application, reduce the Pipeline Size using the -pl# command line argument.
This error cannot occur when the pipeline size is limited to being able to
accommodate four or fewer frames.


