DS92UT16 Datasheet, PDF (4/111 Pages) Texas Instruments – DS92UT16TUF UTOPIA-LVDS Bridge for 1.6 Gbps Bi-directional Data Transfers

DS92UT16
OBSOLETE
SNOS992E – JANUARY 2002 – REVISED APRIL 2013
FUNCTIONAL DESCRIPTION
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UTOPIA INTERFACE
The DS92UT16 has an industry standard UTOPIA interface [1.] supporting Level 2 and Extended Level 2
operation. Depending on its position in the bridge link, it may operate as either the ATM layer or the physical
layer in the UTOPIA protocol.
In Level 2 mode, this interface can be either a 16-bit or an 8-bit wide data path, with both octet and cell level
handshaking and operating at a frequency as high as 52 MHz, facilitating 622 Mbps (STM4/OC12) line rates.
In UTOPIA Level 2 mode, the device supports Multi-PHY (MPHY) operation, whereby up to 31 PHY ports may
be connected to an ATM device. The presence of cells and availability of buffer space is indicated using the
CLAV signals.
UTOPIA Level 2 defines 1 ENB and 1 CLAV signal in each direction. The DS92UT16 has extended this to 8 ENB
and 8 CLAV signals, which enables up to 248 PHY ports to be connected to an ATM device without additional
external circuitry as shown in Figure 3.
Note: The full connections for a single sub-port are shown in Figure 4.
Figure 3. Extended UTOPIA Level 2 for 248 PHY Ports
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