DP83850C datasheet(17/37 Pages) NSC

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4.0 Registers (Continued)

4.2 Page 1 Register Map

4.3 Configuration Register (CONFIG)

Address

(hex)

Name

Access

Description

CONFIG

r/w

Sets the DP83850C conﬁguration (same as page 0 CONFIG register).

PAGE

r/w

Select either register page 0 or 1.

Reserved

SIREV

read only Silicon revision code.

5 - 7

Reserved

8 - B

P6_SE ...

P6_PART

r/w

Port 6 management counters (as per ports 0, 1 above).

C - F

P7_SE ...

P7_PART

r/w

Port 7 management counters (as per ports 0, 1 above).

10 - 13

P8_SE ...

P8_PART

r/w

Port 8 management counters (as per ports 0, 1 above).

14 - 17

P9_SE ...

P9_PART

r/w

Port 9 management counters (as per ports 0, 1 above).

18 - 1B

P10_SE ...

P10_PART

r/w

Port 10 management counters (as per ports 0, 1 above).

1C - 1F

P11_SE ...

P11_PART

r/w

Port 11 management counters (as per ports 0,1 above).

Page 0

Address 0h

Page 1

Address 0h

Bit

Bit Name

Access

Bit Description

D15 - D6

reserved

For compatibility with future enhanced versions these bits must be written as zero.

They are undeﬁned when read.

REGEN_PRE

r/w

Regenerate Preamble: This bit may be used to overwrite/change the repeater mode

(TX or T4) that is set by the MODE[1:0] pins at power-up. If MODE[1:0] is 1, 1 then

this bit is set, otherwise this bit will be zero.

The time when the preamble is regenerated depends upon the type of the PHY (ei-

ther TX or T4 PHYs) attached to the repeater. For a TX PHY, preamble is regenerat-

ed approximately 4 clocks (RXC) after the /IR_ACTIVE assertion, and for a T4 PHY,

preamble is regenerated approximately 12 clocks after the /IR_ACTIVE assertion.

MGTEN

r/w

Management Enable: This bit enables all the management counters.

Management Counters disabled (default).

Management Counters enabled.

Note: The management counters can only be reliably written to when they are dis-

abled.

COL_LIMIT32

r/w

This bit conﬁgures the collision limit for Auto-Partitioning algorithm:

Consecutive Collision Limit set to 64 consecutive collisions (default). A port will

be partitioned on the 65th consecutive collision.

Consecutive Collision Limit set to 32 consecutive collisions. A port will be parti-

tioned on the 33rd consecutive collision.

DIS_PART

r/w

This bit disables the Auto-Partitioning algorithm:

Auto-Partitioning is not disabled (default).

Auto-Partitioning is disabled.

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