UPSD3422EB40U6 datasheet(262/300 Pages) STMICROELECTRONICS

262 / 300 page

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PSD module

UPSD3422, UPSD3433, UPSD3434, UPSD3454

262/300

Figure 93.

Recommended JTAG connector

28.6.7

Chaining UPSD34xx devices

It is possible to chain a UPSD34xx device with other UPSD34xx devices on a circuit board,

and also chain with IEEE 1149.1 compliant devices from other manufacturers. Figure 94 on

page 263 shows a chaining example. The TDO of one device connects to the TDI of the next

device, and so on. Only one device is performing JTAG operations at any given time while

the other two devices are in BYPASS mode. Configuration for JTAG chaining can be made in

PSDsoft Express by choosing “More than one device” when prompted about chaining

devices. Notice in Figure 94 on page 263 that the UPSD34xx devices are chained

externally, but also be aware that the two die within each UPSD34xx device are chained

internally. This internal chaining of die is transparent to the user and is taken care of by

PSDsoft Express and 3rd party JTAG tool software.

The example in Figure 94 on page 263 also shows how to use 6-pin JTAG when chaining

devices. The signals TSTAT and TERR are configured as open-drain type signals from

PSDsoft Express. This facilitates a wired-OR connection of TSTAT signals from multiple

UPSD34xx devices and also a wired-OR connection of TERR signals from those same

multiple devices. PSDsoft Express puts TSTAT and TERR signals into open-drain mode by

default, requiring external pull-up resistors. Click on 'Properties' in the JTAG-ISP window of

PSDsoft Express to change to standard CMOS push-pull outputs if desired, but wired-OR

logic is not possible in CMOS output mode.

TDO

TCK

TMS

VCC

TDI

GND

JEN

TERR

GND

RST

TSTAT

CNTL

TRST

KEY

WAY

VIEW: Looking into face of shrouded

male connector, with 0.025"

posts on 0.1" centers.

Connector reference:

Molex 70247-1401

This connector accepts a 14-pin

ribbon cable such as:

• Samtec:

HCSD-07-D-06.00-01-S-N

• Digikey:

M3CCK-14065-ND

AI09187

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Product(s)

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