DP83256VF-AP NSC [National Semiconductor], DP83256VF-AP Datasheet - Page 95

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

PMID
PMID
PMRD
PMRD
SD
SD
Symbol
6 0 Signal Descriptions
6 2 DP83256VF-AP SIGNAL DESCRIPTIONS
The pin descriptions for the DP83256VF-AP are divided into five functional interfaces PMD Interface PHY Port Interface
Control Bus Interface Clock Interface and Miscellaneous Interface
For a Pinout Summary List refer to Table 8-2 and Figure 8-2 DP83256VF-AP 100-Pin JEDEC Metric PQFP Pinout
PMD INTERFACE
The PMD Interface consists of I O signals used to connect the PLAYER
sublayer
The DP83256VF-AP PLAYER
Interface
The Primary PMD Interface should be used for all PMD implementations that do not require an external scrambler descrambler
function clock recovery function or clock generation function such as a Fiber Optic or Shielded Twisted Pair (SDDI) PMD The
second Alternate PMD Interface can be used to support Unshielded Twisted Pair (UTP) PMDs that require external scrambling
with no external clock recovery or clock generation functions required
Section 3 8 describes how the PLAYER
Note that when the Alternate PMD Interface is not being used the pins that make up the interface must be connected in the
specific way described in the following Alternate PMD Interface table
Primary PMD Interface
b
a
a
b
b
a
Pin
42
41
34
33
40
39
I O
O
I
I
PMD Indicate Data Differential 100k ECL 125 Mbps serial data input signals from the PMD Receiver
into the Clock Recovery Module (CRM) of the PLAYER
PMD Request Data Differential 100k ECL 125 Mbps serial data output signals to the PMD transmitter
Signal Detect Differential 100k ECL input signals from the PMD receiver indicating that a signal is being
received by the PMD receiver
a
device actually has two PMD interfaces The Primary PMD Interface and the Alternate PMD
(Continued)
a
can be connected to the PMD and how the Alternate PMD can be enabled
95
Description
a
device to the Physical Medium Dependant (PMD)
a