TNETA1575

ATM SEGMENTATION AND REASSEMBLY DEVICE

WITH PCI-HOST AND COPROCESSOR INTERFACES

SDNS040C – MAY 1996 – REVISED JUNE 1998

19

POST OFFICE BOX 655303

COP – interface full-indication signal

The COPI interface on the TNETA1575 provides a COPFULL input terminal that indicates when the traffic

coprocessor interface receive FIFOs are within one cell of filling up. The TNETA1575 reacts by deasserting the

UTOPIA receive enable signal (RESCLAV or RXENABLE, depending on whether PHY or ATM mode is

selected) according to the UTOPIA specification. After the COPFULL input terminal goes inactive low, the

TNETA1575 asserts the UTOPIA receive enable signal RESCLAV or RXENABLE, depending on whether PHY

or ATM mode is selected on the UTOPIA interface. If this terminal is not connected, the TNETA1575 operates

under normal conditions.

TNETA1575 / TNETA1585 interconnect

Figure 4 shows the interconnect of the TNETA1575 (SAR) and the TNETA1585 traffic cop, including information

on connection of the control-memory interface, the coprocessor interface, and the cell interfaces.

CTRL

ADDR

TNETA1575

8

SRAM

64K

× 32 or

32K

× 32

TNETA1585

DATA (31–0)

ADDRESS (15–0)

CMOE

CMWE

CMSELHI

LRESET

LINTR

TCCX

RCCX

DAX

COPFULL

Control Memory

Parameter Memory

SRAM

64K

× 32 or

32K

× 32

Figure 4. TNETA1575 Interconnect to TNETA1585