T8207 Datasheet, PDF (53/158 Pages) Agere Systems – ATM Interconnect

Advance Data Sheet
September 2001
CelXpres T8207
ATM Interconnect
9 UTOPIA Interface (continued)
9.7 UTOPIA Clocking
All TX UTOPIA signals in the T8207 are clocked on the rising edge of the TX UTOPIA clock, and all RX UTOPIA
signals are clocked on the rising edge of the RX UTOPIA clock.
The UTOPIA specifications state that the ATM layer supplies the transmit and receive UTOPIA interface clocks to
the PHY layers. The T8207 may be configured to drive these clocks or to be driven by them.
In the T8207, the clocks for transmit and receive UTOPIA interfaces may be independently derived from several
sources. In addition, each of these clocks may be independently configured. The TX UTOPIA clock configuration
(address 010Ch) and RX UTOPIA clock configuration (address 010Eh) registers are used to select and configure
the transmit UTOPIA interface and the receive UTOPIA interface clocks, respectively. See these register descrip-
tions for more information.
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