COM20019IP datasheet(34/81 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 32 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 COM20019 with a 20 MHz crystal

oscillator, the bit combinations follow:

ET2

ET1

Response

Time (mS)

9.548

4.774

2.387

0.597

Idle Time

(mS)

10.496

5.248

2.624

0.656

Reconfig

Time (S)

13.44

6.72

Note:

These

values

are

for

312.5

Kbps

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. This bit must be set to ‘1’ at the COM20019.

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

COM20019IP Arkusz danych(PDF) 34 Page - SMSC Corporation

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