TNETA1575 datasheet(9/45 Pages) TI1

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TNETA1575

ATM SEGMENTATION AND REASSEMBLY DEVICE

WITH PCI-HOST AND COPROCESSOR INTERFACES

SDNS040C – MAY 1996 – REVISED JUNE 1998

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

Terminal Functions (Continued)

miscellaneous signals

TERMINAL

I/O

DESCRIPTION

NAME

NO.

I/O

DESCRIPTION

ATM clock1

PHY mode

ATMCLK1 is driven low and can be left as a no connection (NC).

ATMCLK1

(CMOS)

ATM mode

The ATMCLK1 is used as the clock source to provide for data transfers/

synchronization across the transmit UTOPIA interface between the SAR and

external devices not connected to the PCI-host interface. The ATMCLK1 is

connected to SEGCLK in the ATM mode. If the TNETA1585 is not used, the

ATMCLK1 also can be used as the clock source for the receive UTOPIA interface.

The clock generated by the interface is 33 MHz (nominal), using the PCI clock.

ATMCLK2

(CMOS)

ATM clock2. ATMCLK2 is an auxiliary ATM clock that is used as the clock source to the

TNETA1585 or a similar-type device. When the TNETA1585 is used, ATMCLK2 is also connected

to the RESCLK input. The clock generated by the interface is 33 MHz (nominal), using the PCI

clock.

PHY/ATM

(TTL)

PHY/ATM mode select. PHY/ATM selects ATM mode when low and the PHY mode when high.

power and ground

TERMINAL

DESCRIPTION

NAME

NO.

DESCRIPTION

GND

8, 15, 24, 32, 40, 47, 56, 76, 88, 107, 117, 122,

128, 135, 140, 146, 151, 157, 163, 168, 174, 180,

186, 192, 198, 203, 210, 216, 223, 228, 234, 239

Ground. GND is the 0-V reference for the device.

VCC

6, 17, 38, 49, 60, 65, 93, 115, 132, 143, 161, 170,

178, 188, 196, 205, 221, 230

Supply voltage. VCC is the 3.3-V supply for the digital logic.

VCC(5V)

28, 68, 100, 125, 153, 182, 213, 235

Supply voltage. VCC(5V) is the 5-V supply for the clamp diodes used

with the 5-V tolerant input and output buffers for protection.

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