TNETA1585

ATM TRAFFIC MANAGEMENT SCHEDULER DEVICE

WITH RECEIVE UTOPIA AND COPROCESSOR INTERFACES

SDNS041A – NOVEMBER 1996 – REVISED JULY 1998

14

POST OFFICE BOX 655303

TNETA1585-to-TNETA1575 interconnection

Figure 1 shows the interconnection of the TNETA1575 SAR and the TNETA1585 traffic management scheduler.

CTRL

AD

TNETA1575

SAR

8

SRAM

64K

× 32 or

32K

× 32

TNETA1585

Traffic Management

Scheduler

SCDATA(31–0)

SCAD(5–0)

SCOE

SCWE

SCSEL

RESET

INTR

TCCX

RCCX

DAX

COPFULL

Control Memory

Parameter Memory

SRAM

64K

× 32 or

32K

× 32

Figure 1. TNETA1585 Interconnection to TNETA1575

receive-UTOPIA interface

The TNETA1585 receives ATM cells through a receive-UTOPIA level-1 interface with cell-level handshake only.

This interface is configurable as either an 8-bit PHY or ATM interface. The ATM mode is chosen when the

TNETA1585 interfaces with a framer (such as the TNETA1500). The PHY mode is chosen when the

TNETA1585 interfaces with a switch port. The operation of this dual PHY/ATM interface requires connection

of the UTOPIA signals to the appropriate input terminals of the TNETA1585.

In both modes, the receive UTOPIA interface on the TNETA1585 monitors only, i.e., the device does not actively

participate in the UTOPIA protocol. If the system is to work correctly, a fully compliant UTOPIA-peer device is

required. This interface is designed so that the TNETA1585 could be connected as a peer to the TNETA1575,

which are both then connected to an ATM (e.g., switch port) or PHY device.