DP83257VF National Semiconductor, DP83257VF Datasheet - Page 31

• 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

4 0 Modes of Operation
The PLAYER
STOP LOOPBACK and CASCADE
4 1 RUN MODE
RUN is the normal mode of operation
In this mode the PLAYER
nected to the media via the PMD transmitter and PMD re-
ceiver at the PMD Interface It is also connected to any
other PLAYER
Port A and Port B Interfaces
While operating in the RUN mode the PLAYER
receives and transmits Line States (Quiet Halt Master Idle)
and frames (Active LIne State)
4 2 STOP MODE
The PLAYER
is being initialized or configured
The PLAYER
tomatically when the E RST pin is set to ground
When in STOP mode the PLAYER
following functions
4 3 LOOPBACK MODE
The PLAYER
Configuration Switch Loopback Short Internal Loopback
and Long Internal Loopback These Loopback modes can
be used to test different portions of the device
Configuration Switch Loopback
The Configuration Switch Loopback can be used to test the
data paths of the MACSI device(s) that are connected to the
PLAYER
through the network
In the Configuration Switch Loopback mode the PLAYER
device Configuration Register (CR) can be programmed to
perform the following functions
See Figure 4-1 and Figure 4-2
Resets the Repeat Filter
Resets the Smoother
Resets the Receiver Block Line State Counters
Resets the Clock Recovery Module
Flushes the Elasticity Buffer
Forces Line State Unknown in the Receiver Block
Outputs PHY Invalid condition symbol pairs through the
PHY Data Indicate pins (AIP AIC AID
BID
Outputs Quiet symbol pairs through the PMD Data Re-
quest pins (PMRD
Select Port A PHY Request Data Port B PHY Request
Data or PHY Invalid to connect to Port A PHY Indicate
Data via the A IND Mux
Select Port A PHY Request Data Port B PHY Request
Data or PHY Invalid to connect to Port B PHY Indicate
Data via the B IND Mux
Connect data from the Receiver Block to the Transmitter
Block via the Transmitter Mux (The PLAYER
is repeating incoming data from the media in the Configu-
ration Switch Loopback mode )
k
7 0
a
l
device before transmitting and receiving data
a
a
a
a
) when port is enabled
a
device can operate in 4 basic modes RUN
device operates in the STOP mode while it
device is also reset to the STOP mode au-
device provides 3 types of loopback tests
device(s) and or MACSI device(s) via the
g
)
a
device is configured to be con-
a
device performs the
k
7 0
l
a
a
BIP BIC
device
device
a
31
FIGURE 4-1 Configuration Switch Loopback
FIGURE 4-2 Configuration Switch Loopback
for DP83256 and DP 83256-AP
for DP83257
TL F 11708 – 23
TL F 11708 – 24