4. Internal Switching Fabric > Packet Queuing
91
Tsi578 User Manual
June 6, 2016
Integrated Device Technology
www.idt.com
4.4
Packet Queuing
The Tsi578 has a queuing system on both the ingress and egress ports.
Figure 19: Ingress and Egress Packet Queues in Tsi578
4.4.1
Output Queuing on the Egress Port
Each egress port has a queue that holds up to eight packets. This buffer is required because packets may
need re-transmitting. The buffer is also necessary to store the incoming packets when the egress port
has a slower baud rate than the ingress port. The depth of the buffer queue dictates the switch fabric
flow control. This flow control determines how many packets of a certain priority an egress port can
receive. In the event that the output queue is full, the ingress port is notified and must begin queuing
packets. If the ingress port runs out of buffers for packets as well, RapidIO link level flow control
(packet retries) is activated on the ingress RapidIO port.
Ti
p
For more information on packet retries, refer to
RapidIO Interconnect Specification
(Revision 1.3)
.
Ingress
Packet Queue
Egress
Packet Queue
ISF
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