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| www..com CONFIDENTIAL ERRATA DOCUMENT CYDxxS36V18 CYDxxS18V18 Errata Revision: ** March 15, 2006 Errata Document for CYDxxS36V18/CYDxxS18V18 18-Mb/9-Mb/4-Mb x36/x18 FullFlexTM Dual-Ports This document describes the errata for the 18Mb/9Mb/4Mb x36/x18 FullFlexTM Dual-Ports (CYDxxS36V18/CYDxxS18V18). Details include errata trigger conditions, available workarounds, and silicon revision applicability. This document should be used to compare to the data sheet for this device to fully describe the device functionality. Please contact your local Cypress Sales Representative if you have further questions. Part Numbers Affected Part Number CYD18S36V18 CYD09S36V18 CYD04S36V18 CYD18S18V18 CYD09S18V18 CYD04S18V18 Package 256-Ball FBGA 256-Ball FBGA 256-Ball FBGA 256-Ball FBGA 256-Ball FBGA 256-Ball FBGA Device Characteristics All speed grades All speed grades All speed grades All speed grades All speed grades All speed grades Product Status Sampling Sampling Sampling Sampling Sampling Sampling 18-Mb/9-Mb/4-Mb x36/x18 FullFlex Dual-Ports Errata Summary The ZQ0 and ZQ1 pins on both ports (left and right) are internally shorted in the 256-Ball FBGA package substrate design. This creates an error in the Variable Impedance Matching (VIM) feature on the FullFlex Dual-Ports, as the effective output driver impedance is halved when both resistors are populated. The workaround is to remove the resistors on ZQ1L and ZQ1R for the affected devices. Variable Impedance Matching (VIM) * PROBLEM DEFINITION The 256-Ball FBGA package substrate design has the ZQ0L pin shorted to ZQ1L and ZQ0R shorted to ZQ1R. The ZQ1L and ZQ1R pins are not internally connected to the die for the affected devices; therefore, when resistors are connected to these pins to ground, the effective output driver impedance for each port is halved. * PARAMETERS AFFECTED Effective output driver impedance controlled by the VIM circuitry. * TRIGGER CONDITION(S) If the designer populates resistors for both ZQ0 and ZQ1, the short between ZQ0 and ZQ1 halves the effective impedance seen by the VIM calibrating circuitry. * SCOPE OF IMPACT Output driver impedance is halved, as the two VIM calibrating resistors are in parallel to ground. * WORKAROUND Remove ZQ1L and ZQ1R VIM resistors. Disconnecting these two resistors and leaving the pins open allow the calibrating circuitry to set the correct output driver impedance. * FIX STATUS The date for the substrate design fix is TBD. References 1. Document # 38-06072, FullFlex Synchronous DDR Dual-Port SRAM 2. Document # 38-06082, FullFlex Synchronous SDR Dual-Port SRAM Cypress Semiconductor Corporation Document #: 001-07077 Rev. ** * 198 Champion Court * San Jose, CA 95134-1709 * 408-943-2600 Revised March 28, 2006 CONFIDENTIAL ERRATA DOCUMENT Document History Page CYDxxS36V18 CYDxxS18V18 Document Title: Errata Document for CYDxxS36V18/CYDxxS18V18 18-Mb/9-Mb/4-Mb x36/x18 FullFlexTM Dual-Ports Document Number: 001-07077 REV. ** ECN NO. 435564 Issue Date See ECN Orig. of Change YDT Original release of spec Description of Change Document #: 001-07077 Rev. ** Page 2 of 2 |
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