DP83256VF-AP NSC [National Semiconductor], DP83256VF-AP Datasheet - Page 19

• Manufacturer Part Number: DP83256VF-AP
• Manufacturer: NSC [National Semiconductor]

3 0 Functional Description
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
FIGURE 3-11 Single Attachment Station (SAS)
FIGURE 3-10 Single Attach Station
Using the DP83256 or DP83256-AP
Using the DP83257
(Continued)
TL F 11708– 13
TL F 11708– 14
19
13 )
Figure 3-14 )
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 )
A DAS with a single MAC and one path using the DP83256
or DP83256-AP can be configured as follows (see Figure 3-
A DAS with dual MACs can be configured as follows (see
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 B
The MAC can be connected to either the A Request in-
put and the A Indicate output of PHY A or the B Re-
quest input and the B Indicate output of PHY B
B Request input of PHY A is connected to A Indicate
output of PHY B
The MAC is connected to the B Request input of
PHY B and the A Indicate output of PHY A
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 B
MAC 1 is connected to the B Indicate output and the
B Request Input of PHY B
MAC 2 is connected to the A Indicate output and the
A Request Input of PHY A