IDT77V1264L200PGI IDT, Integrated Device Technology Inc, IDT77V1264L200PGI Datasheet - Page 28

• Manufacturer Part Number: IDT77V1264L200PGI
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of IDT77V1264L200PGI

• Number Of Channels: 4
• Type Of Atm Phy Interface: UTOPIA
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3.13V
• Operating Supply Voltage (max): 3.47V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Pin Count: 144
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Not Compliant

Diagnostic Functions
ters:
transmission by the PMD. Receive data from the PMD is decoded along with its clock for transfer to the receiving "upstream system".
receive interface. Note that while this mode is operating, no data is forwarded to or received from the line interface. When Bits [1:0] in the Diagnostic
Control Registers are set to 10, the PHY loopback mode works only if clock multiplier is 1x. For higher multiplies, these bits must be set to 01.
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.
IDT77V1264L200
Loopback
There are two loopback modes supported by the 77V1264L200. The loopback mode is controlled via bits 1 and 0 of the Diagnostic Control Regis-
Normal Mode
This mode, Figure 32, supports normal operating conditions: data to be transmitted is transferred to the TC, where it is queued and formatted for
PHY Loopback
As Figure 33 illustrates below, this loopback mode provides a connection within the PHY from the transmit PHY-ATM interface to the PHY-ATM
Line Loopback
Figure 34 might also be called “remote loopback” since it provides for a means to test the overall system, including the line. Since this mode will
P_TCLK
P_TFRM
P_TD(3:0)
(out)
(in)
(in)
Nibble 104
Cell 1
Nibble 105
Cell 1
0
1
1
Bit 1
77V1254 Not Ready
ATM Layer Device Not Ready
Figure 31 DPI Transmit Handshake - Neither Device Ready
X
0
0
1
Bit 0
X
Normal operating mode
PHY Loopback
Line Loopback
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X
X
Mode
Nibble 0
Cell 2
Nibble 1
Cell 2
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Nibble 2
Cell 2
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