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SMSC LAN91C111 32/16/8-Bit Three-In-One Fast Ethernet Controller
SMSC AN 9.6 21 Revision 1.0 (08-14-08)
APPLICATION NOTE
From the table listed above, the interface is capable of multiple types of connections. The ability to
have different types of interface connected simultaneously if a very powerful feature for a design
engineer.
3.13 Sample Routine of Performance Measurement and Tuning
It is important for system designers to design their system efficiently to reduce system latencies and
enhance overall performance. Low latency is the key to increase the system performance.
The below flow chart shows a ping operation from a remote machine to the LAN91C111; there are 14
major steps in the routine. We recommend system engineers to measure the timing taken for each
single procedure of the routine in their system, then find out where the delay is generated to tune up
the system performance.
SIGNAL NAME BRIEF DESCRIPTION
LCLK Clock Input
W/nR Read or Write operation, Read active low
nRDYRTN Used to insert wait states
OPTIONAL SIGNALS
nDATACS Direct access 32-bit mode operation
nCYCLE Used to indicate Burst operation