DP83848JSQSLASHNOPB datasheet(51/84 Pages) TI1

51 / 84 page

DP83848H, DP83848J, DP83848K, DP83848M, DP83848T

www.ti.com

SNLS250E – MAY 2008 – REVISED APRIL 2015

6.6.1.1

In the register definitions under the ‘Default’ heading, the following definitions hold true:

•

RW = Read Write access

•

SC = Register sets on event occurrence and Self-Clears when event ends

•

RW/SC = Read Write access/Self Clearing bit

•

RO = Read Only access

•

COR = Clear on Read

•

RO/COR = Read Only, Clear on Read

•

RO/P = Read Only, Permanently set to a default value

•

LL = Latched Low and held until read, based upon the occurrence of the corresponding event

•

LH = Latched High and held until read, based upon the occurrence of the corresponding event

6.6.1.1.1 Basic Mode Control Register (BMCR)

Table 6-9. Basic Mode Control Register (BMCR), address 0x00

Bit

Bit Name

Default

Description

Reset

0, RW/SC

Reset:

1 = Initiate software Reset / Reset in Process.

0 = Normal operation.

This bit, which is self-clearing, returns a value of one until the reset process is complete. The

configuration is re-strapped.

Loopback

0, RW

Loopback:

1 = Loopback enabled.

0 = Normal operation.

The loopback function enables MII transmit data to be routed to the MII receive data path.

Setting this bit may cause the descrambler to lose synchronization and produce a 500 µs “dead

time” before any valid data will appear at the MII receive outputs.

Speed Selection

Speed Select:

When auto-negotiation is disabled writing to this bit allows the port speed to be selected.

1 = 100 Mb/s.

0 = 10 Mb/s.

Auto-Negotiation

Auto-Negotiation Enable:

Enable

Strap controls initial value at reset.

1 = Auto-Negotiation Enabled - bits 8 and 13 of this register are ignored when this bit is set.

0 = Auto-Negotiation Disabled - bits 8 and 13 determine the port speed and duplex mode.

Power Down

0, RW

Power Down:

1 = Power down.

0 = Normal operation.

Setting this bit powers down the PHY. Only the register block is enabled during a power-down

condition.

Isolate

0, RW

Isolate:

1 = Isolates the Port from the MII with the exception of the serial management.

0 = Normal operation.

Restart Auto-

0, RW/SC

Restart Auto-Negotiation:

Negotiation

1 = Restart Auto-Negotiation. Re-initiates the Auto-Negotiation process. If Auto-Negotiation is

disabled (bit 12 = 0), this bit is ignored. This bit is self-clearing and will return a value of 1 until

Auto-Negotiation is initiated, whereupon it will self-clear. Operation of the Auto-Negotiation

process is not affected by the management entity clearing this bit.

0 = Normal operation.

Duplex Mode

Duplex Mode:

When auto-negotiation is disabled writing to this bit allows the port Duplex capability to be

selected.

1 = Full Duplex operation.

0 = Half Duplex operation.

Detailed Description

Submit Documentation Feedback

Product Folder Links: DP83848H DP83848J DP83848K DP83848M DP83848T

DP83848JSQ/NOPB Datasheet(PDF) 51 Page - Texas Instruments

DP83848JSQ/NOPB Datasheet(HTML) 51 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84

Datasheet Download

Link URL