COM20020IP3V datasheet(41/82 Pages) SMSC

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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 COM20020 with a 20 MHz crystal

oscillator, the bit combinations follow:

ET2

ET1

Response

Time (

μS)

596.6

298.4

149.2

37.4

Idle Time

(

μS)

656

328

164

Reconfig

Time

(mS)

840

420

Note: These values are for 5Mbps and RCNTMR[1,0]=00.

Reconfiguration time is changed by the RCNTMR1 and

RCNTMR0 bits.

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

Tentative ID

Node ID

Setup 1

Next ID

COM20020IP3V 데이터시트(PDF) 41 Page - SMSC Corporation

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