COM20022I-3.3V Datasheet, PDF (38/73 Pages) SMSC Corporation – 10 Mbps ARCNET (ANSI 878.1) Controller with 2Kx8 On-Chip RAM

BIT
BIT NAME
1,0 Reconfiguration
Timer 1, 0
10 Mbps ARCNET (ANSI 878.1) Controller with 2Kx8 On-Chip RAM
Datasheet
SYMBOL
DESCRIPTION
RCNTM1,0 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 10 Mbps.
RCNTM1 RCNTM0
Time Out
Period
Max Node Count
0
0
210 mS
Up to 255 nodes
0
1
52.5 mS Up to 64 nodes
1
0
26.25 mS Up to 32 nodes
1
1
13.125 mS* Up to 16 nodes
Note*: The node ID value 255 must exist in the network for
13.125 mS timeout to be valid.
BIT
BIT NAME
7 16 Bit Access
6-0 Reserved
Table 6.14 - Bus Control Register
SYMBOL
W16
DESCRIPTION
This bit is used to Disable/Enable the 16 bit access.
It influences only DATA register access.
W16= 0: Disable (Default); W16= 1: Enable
These bit are undefined. They must be 0.
Revision 03-08-07
Page 38
DATASHEET
SMSC COM20022I 3.3V Rev.C