DP83257VF National Semiconductor, DP83257VF Datasheet - Page 89

• Manufacturer Part Number: DP83257VF
• Description: IC FDDI LAYER CTRLR 160PQFP
• Manufacturer: National Semiconductor

Specifications of DP83257VF

• Controller Type: physical layer controller
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 160-BFQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Supply: -
• Interface: -
• Other names: *DP83257VF

PMID
PMID
PMRD
PMRD
SD
SD
TEL
TXE
Symbol
6 0 Signal Descriptions
6 1 DP83256VF PIN DESCRIPTIONS
The pin descriptions for the DP83256VF are divided into 5 functional interfaces PMD Interface PHY Port Interface Control Bus
Interface Clock Interface and Miscellaneous Interface
For a Pinout Summary list refer to Table 8-1 and Figure 8-1 DP83256VF 100-Pin JEDEC Metric PQFP Pinout
PMD INTERFACE
The PMD Interface consists of I O signals used to connect the PLAYER
sublayer
b
a
a
b
b
a
Pin
39
38
33
32
37
36
47
46
I O
O
O
I
I
I
PMD Indicate Data Differential 100k ECL 125 Mbps serial data input signals from the PMD receiver
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
PMD Transmitter Enable Level A TTL input signal to select the PMD transmitter Enable (TXE) signal
level
PMD Transmitter Enable A TTL output signal to enable disable the PMD transmitter The output level
of the TXE pin is determined by three parameters the Transmit Enable (TE) bit in the Mode Register the
TM2-TM0 bits in the Current Transmit State Register and the input to the TEL pin The following rules
summarize the output of the TXE pin
1 If TE
2 If TE
3 If TE
4 If TE
5 If TE
6 If TE
e
e
e
e
e
e
0 and TEL
0 and TEL
1 and OTM and TEL
1 and OTM and TEL
1 and not OTM and TEL
1 and not OTM and TEL
e
e
GND then TXE
V
CC
then TXE
e
e
GND then TXE
V
CC
e
e
GND then TXE
V
e
89
then TXE
CC
e
GND
V
then TXE
CC
Description
e
e
a
GND
V
e
CC
e
device to the Physical Medium Dependant (PMD)
V
GND
CC