COM20020 Datasheet, PDF (37/72 Pages) SMSC Corporation – COM20020 3.3V ULANC Universal Local Area Network Controller with 2K x 8 On-Board RAM

BIT
BIT NAME
2 No Synchronous
1,0 Reconfiguration
Timer 1, 0
SYMBOL
NOSYNC
RCNTM1,0
DESCRIPTION
This bit is used to enable the SYNC command during
initialization. NOSYNC= 0, Enable (Default) The line must
be idle for the RAM initialization sequence to be written.
NOSYNC= 1, Disable:) The line does not have to be idle for
the RAM initialization sequence to be written. See appendix
“A”.
These bits are used to program the reconfiguration timer as a
function of maximum node count. These bits set the time out
period of the reconfiguration timer as shown below. The
time out periods shown are for 5 Mbps.
RCNTM1 RCNTM0
Time Out
Max Node Count
Period
0
0
420 mS
Up to 255 nodes
0
1
105 mS
Up to 64 nodes
1
0
52.5 mS
Up to 32 nodes
1
1
26.25 mS*
Up to 16 nodes
Note*: The node ID value 255 must exist in the network for
26.25 mS timeout to be valid.
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