89HPES32H8ZAALI datasheet(9/40 Pages) IDT

Part #	89HPES32H8ZAALI

Description	32-Lane 8-Port PCI Express System Interconnect Switch

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Manufacturer	IDT [Integrated Device Technology]

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July 19, 2007

IDT 89HPES32H8 Data Sheet

Signal

Type

Name/Description

JTAG_TCK

I

JTAG Clock. This is an input test clock used to clock the shifting of data into or out of

the boundary scan logic or JTAG Controller. JTAG_TCK is independent of the system

clock with a nominal 50% duty cycle.

JTAG_TDI

I

JTAG Data Input. This is the serial data input to the boundary scan logic or JTAG

Controller.

JTAG_TDO

O

JTAG Data Output. This is the serial data shifted out from the boundary scan logic or

JTAG Controller. When no data is being shifted out, this signal is tri-stated.

JTAG_TMS

I

JTAG Mode. The value on this signal controls the test mode select of the boundary

scan logic or JTAG Controller.

JTAG_TRST_N

I

JTAG Reset. This active low signal asynchronously resets the boundary scan logic

and JTAG TAP Controller. An external pull-up on the board is recommended to meet

the JTAG specification in cases where the tester can access this signal. However, for

systems running in functional mode, one of the following should occur:

1) actively drive this signal low with control logic

2) statically drive this signal low with an external pull-down on the board

Table 6 Test Pins

Signal

Type

Name/Description

VDDCORE

I

Core VDD. Power supply for core logic.

VDDIO

I

I/O VDD. LVTTL I/O buffer power supply.

VDDPE

I

PCI Express Digital Power. PCI Express digital power used by the digital

power of the SerDes.

VDDAPE

I

PCI Express Analog Power. PCI Express analog power used by the PLL

and bias generator.

VSS

I

Ground.

VTTPE

PCI Express Serial Data Transmit Termination Voltage. This pin allows

the driver termination voltage to be set, enabling the system designer to

control the Common Mode Voltage and output voltage swing of the corre-

sponding PCI Serial Data Transmit differential pair.

Table 7 Power and Ground Pins

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