Subject: BCM1250 Current Descriptor

From: "Gilad Benjamini" <[email-masked]>
Date: Tue, 28 Oct 2003 22:16:36 +0200

Hi,
I have a question which is specific for the BCM1250. I hope this
is the right forum to ask this, if not, my apologies.
 
In an RX DMA channel the BCM1250 signals a received packet
by turning on the SOP bit. When a packet arrives, the current_descriptor
register also updates to the next packet.
Could there be a (non-trivial) time gap between the update of those ?
We see a scenario where the SOP bit is on, but the descriptor count 
shows that the packet still belongs to the DMA. How can this be ?
 
TIA