Microsemi Corporation April 4, 2014 Customer Notification No: CN1413 Customer Advisory Notice (CAN) – Action Required Subject: uSRAM and LSRAM timing updates in SmartFusion2 SoC and IGLOO2 FPGAs Description of Issue(s): This notification describes timing updates made to the LSRAM and uSRAM blocks in SmartFusion2 SoC FPGA and IGLOO2 FPGAs. These changes are effective in the Libero SoC v11.3 software release. Detailed changes and expected impact on design performance are provided here to help designers identify whether their designs are likely to be impacted by these timing changes. The IGLOO2 Datasheet (revision 2) on the web contains the new timing data. The SmartFusion2 Datasheet will be updated to revision 6 with the same data. In the interim, users can use the IGLOO2 Datasheet timing information as a reference. Change Description 1. LSRAM Fmax Read and Write clock (and Pipeline clock) decreased to 400MHz (IND -1), 300MHz (MIL, -1), 340MHz (IND, STD), 255MHz (MIL, STD). These changes impact the following parameters in the datasheet: LSRAM under WC Conditions Parameter tCY tCLKMPWH tCLKMPWL Description Clock Period Clock Minimum Pulse Width High Clock Minimum Pulse Width Low Condition -1 Std Units Min Max Min Max COM 2.5 - 2.941 - IND 2.5 - 2.941 MIL 3.333 - 3.921 COM 1.125 - 1.323 IND 1.125 - 1.323 MIL 1.5 - 1.765 COM 1.125 - 1.323 - ns IND 1.125 - 1.323 - ns MIL 1.5 - 1.765 - ns Microsemi Corporation One Enterprise, Aliso Viejo CA 92656 USA Within the USA: +1 (949) 380-6100 · Sales: +1 (949) 380-6136 Fax: +1 (949) 215-4996 · www.microsemi.com ns ns - ns ns - ns ns CN1413-0/4.14 -1- LSRAM under WC Conditions Parameter tPLCY tPLCLKMPWH tPLCLKMPWL Description Pipelined Clock Period Pipelined Clock Minimum Pulse Width High Pipelined Clock Minimum Pulse Width Low Condition -1 Std Units Min Max Min Max COM 2.5 - 2.941 - ns IND 2.5 - 2.941 - ns MIL 3.333 - 3.921 - ns COM 1.125 - 1.323 - ns IND 1.125 - 1.323 - ns MIL 1.5 - 1.765 - ns COM 1.125 - 1.323 - ns IND 1.125 - 1.323 - ns MIL 1.5 - 1.765 - ns Microsemi Corporation One Enterprise, Aliso Viejo CA 92656 USA Within the USA: +1 (949) 380-6100 · Sales: +1 (949) 380-6136 Fax: +1 (949) 215-4996 · www.microsemi.com CN1413-0/4.14 -2- 2. uSRAM Fmax Read and Write clock (and Pipeline clock) decreased to 250MHz (-1 and STD) uSRAM under WC Conditions Parameter tCY tCLKMPWH tCLKMPWL tPLCY tPLCLKMPWH tPLCLKMPWL tCCY tCCLKMPWH tCCLKMPWH Description Condition Read Clock Period Read Clock Minimum Pulse Width High Read Clock Minimum Pulse Width Low Read Pipelined Clock Period Read Pipelined Clock Minimum Pulse Width High Read Pipelined Clock Minimum Pulse Width Low Write Clock Period Write Clock Minimum Pulse Width High Write Clock Minimum Pulse Width Low Microsemi Corporation One Enterprise, Aliso Viejo CA 92656 USA Within the USA: +1 (949) 380-6100 · Sales: +1 (949) 380-6136 Fax: +1 (949) 215-4996 · www.microsemi.com -1 Std Units Min Max Min Max COM 4 - 4 - ns IND 4 - 4 - ns MIL 4 - 4 - ns COM 1.8 - 1.8 - ns IND 1.8 - 1.8 - ns MIL 1.8 - 1.8 - ns COM 1.8 - 1.8 - ns IND 1.8 - 1.8 - ns MIL 1.8 - 1.8 - ns COM 4 - 4 - ns IND 4 - 4 - ns MIL 4 - 4 - ns COM 1.8 - 1.8 - ns IND 1.8 - 1.8 - ns MIL 1.8 - 1.8 - ns COM 1.8 - 1.8 - ns IND 1.8 - 1.8 - ns MIL 1.8 - 1.8 - ns COM 4 - 4 - ns IND 4 - 4 - ns MIL 4 - 4 - ns COM 1.8 - 1.8 - ns IND 1.8 - 1.8 - ns MIL 1.8 - 1.8 - ns COM 1.8 - 1.8 - ns IND 1.8 - 1.8 - ns MIL 1.8 - 1.8 - ns CN1413-0/4.14 -3- 3. Other uSRAM timing updates are depicted below: uSRAM under WC Conditions Parameter tCLK2Q tADDRSU tADDRHD Description Condition -1 Std Before New Before New Units Read Access Time with Pipeline Register COM 0.34 0.23 0.4 0.27 ns Read Access Time without Pipeline Register COM 1.75 1.18 2.06 1.39 ns Read Address Setup Time in Synchronous Mode COM 0.17 0.13 0.2 0.15 ns Read Address Setup Time in Asynchronous Mode COM 0.93 1.65 1.09 1.94 ns Read Address Hold Time in Synchronous Mode COM 0.11 0.08 0.13 0.1 ns Read Address Hold Time in Asynchronous Mode COM 0.07 -0.62 0.09 -0.73 ns Performance Impact Designs accessing the uSRAM or LSRAM at clock rates above the new frequency limits will see these rates dropping to the new limit. Suggested Action If SRAM blocks are being used in the design, users should perform a new static timing analysis using SmartTime in the Libero SoC v11.3 release. Products Affected by this Change Refer to Addendum A for the complete product list (click on the paper clip icon in the upper left margin of this document to view). Contact Information: Microsemi SoC Products Group. [email protected]. Regards, Microsemi Corporation The Customer Notice (CN) or Customer Advisory Notice (CAN) is confidential and proprietary information of Microsemi and is intended only for distribution by Microsemi to its customers, for customers’ use only. It must not be copied or provided to any third party without Microsemi's prior written consent. Microsemi Corporation One Enterprise, Aliso Viejo CA 92656 USA Within the USA: +1 (949) 380-6100 · Sales: +1 (949) 380-6136 Fax: +1 (949) 215-4996 · www.microsemi.com CN1413-0/4.14 -4-