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DP83256 Fiches technique(PDF) 32 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No de pièce DP83256
Description  PLAYERa??Device (FDDI Physical Layer Controller)
PDF  144 Pages
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
Logo NSC - National Semiconductor (TI)

DP83256 Fiches technique(HTML) 32 Page - National Semiconductor (TI)

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40 Modes of Operation (Continued)
Short Internal Loopback
The Short Internal Loopback mode can be used to test the
functionality of the PLAYERa device not including the
Clock Recovery function and to test the data paths be-
tween the PLAYERa device and MACSI devices before
ring insertion
When in the Short Internal Loopback mode the PLAYERa
device performs the following functions
 Directs the output data of the Transmitter Block to the
input of the Receiver Block through an internal path
 Ignores the PMD Data Indicate pins (PMIDg)
 Outputs Quiet symbols through the PMD Data Request
pins (PMRDg)
The level of the Quiet symbols transmitted through the
PMRDg pins during loopback is automatically set to the
transmitter off level
If both Short Internal Loopback and Long Internal Loopback
modes are selected Long Internal Loopback mode will
have priority over Short Internal Loopback mode This is the
longest loopback path within the PLAYERa device
See
Figure 4-3 Short Internal Loopback
TLF11708 – 25
FIGURE 4-3 Short Internal Loopback
32



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