77V106L25TFG IDT, Integrated Device Technology Inc, 77V106L25TFG Datasheet - Page 13

• Manufacturer Part Number: 77V106L25TFG
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 77V106L25TFG

• 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: 0C to 70C
• Operating Temperature Classification: Commercial
• Pin Count: 64
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

Loopback
There are two loopback modes supported by the 77V106. The loopback mode is controlled
via bits 1 and 0 of the Diagnostic Control Register.
Normal Mode
transferred to the TC, where it is queued and formatted for transmission by the
PMD. Receive data from the PMD is decoded along with its clock for transfer
to the receiving "upstream system".
PHY Loopback
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.
IDT77V106L25
Figure 12 shows normal operating conditions: data to be transmitted is
As Figure 13 illustrates below, this loopback mode provides a connection
ATM Layer
Bit 1
ATM Layer
Device
0
1
1
ATM Layer
Device
Device
Bit 2
0
0
1
Interface
Utopia
Interface
Utopia
Normal operating mode
PHY Loopback
Line Loopback
Interface
Utopia
Mode
TC sublayer
TC sublayer
Figure 13. PHY Loopback
TC sublayer
Figure 14. Line Loopback
Figure 12. Normal Mode
13
Line Loopback
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 commands. A common example would be command asking
the upstream system to direct the TC to leave this loopback state and resume
normal operations.
Figure 14 might also be called "remote loopback" since it provides for a
PMD sublayer
PMD sublayer
sublayer
PMD
77v106 drw 33
Interface
77v106 drw 35
Line
77v106 drw 34
Interface
Interface
Line
Line