DP83256 datasheet(20/146 Pages) TI1

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30 Functional Description (Continued)

STATION CONFIGURATIONS

Single Attach Station (SAS)

The Single Attach Station can be connected to either the

Primary or Secondary ring via a Concentrator Only 1 MAC

is needed in a SAS

The DP83256 DP83256-AP and DP83257 can be used in a

Single Attach Station The DP83256 and DP83256-AP can

be connected to the MAC via its only PHY Port interface

The DP83257 can be connected to the MAC via either one

of its 2 PHY Port Interfaces

See

Figure 3-10 and Figure 3-11

TLF11708 – 13

FIGURE 3-10 Single Attach Station

Using the DP83256 or DP83256-AP

TLF11708 – 14

FIGURE 3-11 Single Attachment Station (SAS)

Using the DP83257

Dual Attach Station(DAS)

A Dual Attach Station can be connected directly to the dual

ring or optionally to a concentrator There are two types of

Dual Attach Stations DAS with a single MAC and DAS with

two MAC layers See

Figure 3-12 and Figure 3-13

Two DP83256 or DP83256-AP parts can be connected to-

gether to build a Dual Attach Station however this configu-

ration does not support the optional Thru

B configuration

When the optional Thru

B configuration is desired it is rec-

ommended that the DP83257 be used

A DAS with a single MAC and two paths can be configured

as follows (see

Figure 3-12 )

B Indicate data of PHY A is connected to A Request

input of PHY

B B

Request input of PHY

A is con-

nected to A Indicate output of PHY

The MAC can be connected to either the A Request in-

put and the A Indicate output of PHY

AortheBRe-

quest input and the B Indicate output of PHY

A DAS with a single MAC and one path using the DP83256

or DP83256-AP can be configured as follows (see

Figure 3-

13 )

B Request input of PHY A is connected to A Indicate

output of PHY

The MAC is connected to the B Request input of

PHY

B and the A

Indicate output of PHY

A DAS with dual MACs can be configured as follows (see

Figure 3-14 )

B Indicate data of PHY A is connected to A Request

input of PHY

B B

Request input of PHY

A is con-

nected to A Indicate output of PHY

MAC 1 is connected to the B Indicate output and the

Request Input of PHY

MAC 2 is connected to the A Indicate output and the

Request Input of PHY

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