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COM20020D датащи(PDF) 33 Page - SMSC Corporation

номер детали COM20020D
подробное описание детали  ULANC Revision D Universal Local Area Network Controller with 2K x 8 On-Board RAM
PDF  72 Pages
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производитель  SMSC [SMSC Corporation]
домашняя страница  http://www.smsc.com
Logo SMSC - SMSC Corporation

COM20020D датащи(HTML) 33 Page - SMSC Corporation

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33
Table 10 - Configuration Register
4,3
Extended
Timeout 1,2
ET1, ET2
These bits allow the network to operate over longer distances
than the default maximum 2 miles by controlling the
Response, Idle, and Reconfiguration Times. All nodes should
be configured with the same timeout values for proper
network operation.
For the COM20020D with a 20 MHz
crystal oscillator, the bit combinations follow:
ET2
0
0
1
1
ET1
0
1
0
1
Response
Time (
µS)
596.6
298.4
149.2
37.4
Idle Time
(
µS)
656
328
164
41
Reconfig
Time
(mS)
840
840
840
420
Note: These values are for 5Mbps and RCNTMR[1,0]=00.
Reconfiguration time is changed by the RCNTMR1 and
RCNTMR0 bits.
2
Backplane
BACK-
PLANE
A logic "1" on this bit puts the device into Backplane Mode
signaling which is used for Open Drain and Differential Driver
interfaces.
1,0
Sub Address 1,0
SUBAD
1,0
These bits determine which register at address 07 may be
accessed. The combinations are as follows:
SUBAD1
SUBAD0 Register
0
0
Tentative ID
0
1
Node ID
1
0
Setup 1
1
1
Next ID
See also the Sub Address Register.



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