IDT77V107L25PFI IDT, Integrated Device Technology Inc, IDT77V107L25PFI Datasheet - Page 13

• Manufacturer Part Number: IDT77V107L25PFI
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT77V107L25PFI

• Data Rate: 25.6/51.2Mbps
• Number Of Channels: 1
• Type Of Atm Phy Interface: UTOPIA
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Pin Count: 100
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Not Compliant

Diagnostic Functions
1. Loopback
back mode is controlled via bits 1 and 0 of the Diagnostic Control Regis-
ters:
Normal Mode
is transferred to the TC, where it is queued and formatted for transmis-
sion by the PMD. Receive data from the PMD is decoded along with its
clock for transfer to the receiving "upstream system".
IDT77V107
There are two loopback modes supported by the 77V107. The loop-
Figure 12 shows normal operating conditions: data to be transmitted
ATM Layer
Device
ATM Layer
ATM Layer
Device
Device
Interface
Interface
Utopia
Interface
Utopia
Utopia
TC sublayer
TC sublayer
TC sublayer
Figure 13 PHY Loopback
Figure 14 Line Loopback
Figure 12 Normal Mode
13 of 24
PHY Loopback
connection within the PHY from the transmit PHY-ATM interface to the
PHY-ATM receive interface. Note that while this mode is operating, no
data is forwarded to or received from the line interface.
Line Loopback
a means to test the overall system, including the line. Since this mode
will probably be entered under direction from another system (at a
remote location), receive data is also decoded and transferred to the
upstream system to allow it to listen for commands. A common example
would be a command asking the upstream system to direct the TC to
leave this loopback state, and resume normal operations.
As Figure 13 illustrates below, this loopback mode provides a
Figure 14 might also be called “remote loopback” since it provides for
PMD sublayer
PMD sublayer
sublayer
PMD
77v1054 drw 35
77v1054 drw 34
Interface
December 2004
5362 drw 33
Interface
Interface
Line
Line
Line