T-8207-BAL-DB View Datasheet(PDF) - Agere -> LSI Corporation

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T-8207-BAL-DB

CelXpres™ ATM Interconnect

Agere -> LSI Corporation 

CelXpres T8207

ATM Interconnect

Advance Data Sheet

September 2001

9 UTOPIA Interface

The CelXpres T8207 supports the ATM Forum’s UTOPIA level 1 and level 2 specifications for cell-level handshake

and MPHY operation with rates up to 353 Mbits/s. The device may be configured as an ATM layer or as a PHY

layer by programming the phyen* bit in the main configuration 1 register (address 0100h).

As an ATM layer, the device may interface with a single PHY layer or multiple PHY layers (up to 32). Also as an

ATM layer, it may be configured for shared UTOPIA mode if 16 or less PHYs are used. (Note that if shared UTOPIA

mode is not used, the slave_en bit in the main configuration/control register (address 0110h) must be cleared at

device setup.)

In PHY mode, the T8207 functions as a single PHY device on the UTOPIA bus or as one of 31 PHY devices on the

UTOPIA level two bus.

In addition to the required UTOPIA signals, the T8207 supports an additional three transmit and three receive

enable (u_txenb*[3:1] and u_rxenb*[3:1]) signals, an additional three transmit and three receive cell available

(u_txclav[3:1] and u_rxclav[3:1]) signals, a transmit parity (u_txprty) signal, and a receive parity (u_rxprty) signal.

The T8207 UTOPIA signal names begin with u_tx, for UTOPIA transmit, or u_rx, for UTOPIA receive. Refer-

ences to transmit or receive are made relative to the UTOPIA data flow for the ATM layer UTOPIA interface.

Therefore, signals starting with u_rx, such as u_rxenb*[3:0] and u_rxdata[7:0], are receive UTOPIA signals

for devices in ATM mode but are transmit UTOPIA signals for devices in PHY mode. Furthermore, signals

such as u_txclav[3:0] and u_txaddr[4:0] are transmit UTOPIA signals for devices in ATM mode but are

receive UTOPIA signals for devices in PHY mode. The above ATM to PHY terminology will be used

throughout this UTOPIA Interface section.

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Agere Systems Inc.

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