1
July 28, 200071V656xx and 71V658xx Device Errata for Rev. 1.0
©2000 Integrated Device Technology, Inc.
Notes
Supplemental Information
IDT71V656xx and IDT71V658xx Device Errata
This Device Errata reflects Z versions of silicon involving IDT71V656xx and IDT71V658xx, 9M ZBT
family devices and supplements information found in the documentation for these devices. Silicon revisions can
be identified as follows:
Z is revision 1.0
Descriptions and Workarounds
Revision History
July 28, 2000: First version of device errata for Revision 1.0 silicon
Item #1: - JTAG Functionality and Associated Pins
Issue: The JTAG circuitry does not function on the current version of silicon. The goal of JTAG in
these memory devices is to provide the ability to perform boundary scan. The goal of boundary scan is to have the
ability at board level to test and ensure that all pins of the device are properly connected.
All items referent to this function have been removed from the datasheet. These include:
The inoperative TMS, TDI, TDO and TCK functions on the following pins and respective packages:
Pins 38, 39, 42, and 43 on
100 pin thin quad plastic flatpack (TQFP)
Pins U2, U3, U4, and U5 on 119 ball grid array (BGA)
Pins P5, R5, P7, and R7 on 165 fine pitch ball grid array (fBGA)
Workaround: These JTAG pins are currently not bonded to the die. Without harm to the function of
these memory devices, the JTAG pins can be left unconnected, tied LOW (VSS), or tied HIGH (VDD).
Fix: - The JTAG circuitry will be functional on the next revision of silicon, scheduled for release in
Quarter 02, 2002.
256K x 36 and 512K x 18 3.3V Synchronous
ZBT
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