Description

This Release Notes and Known Issues Answer Record is for the Memory Interface Generator (MIG) v3.0 released in ISE 11.1 and contains the following information:  

- General Information  

- Software Requirements 

- New Features  

- Resolved Issues 

- Known Issues  

For installation instructions, general CORE Generator known issues, and design tools requirements, see the IP Release Notes Guide at: 

http://www.xilinx.com/support/documentation/ip_documentation/xtp025.pdf

Solution

General Information  

MIG v3.0 is available through the ISE 11.1 Update. For a list of supported memory interfaces and frequencies, see the MIG User Guide: 

http://www.xilinx.com/support/documentation/user_guides/ug086.pdf
 

Software Requirements 

- Xilinx ISE Design Suite 11.1 

- Synplify Pro 9.6.2 support 

- 32-bit Windows XP 

- 32-bit Linux Red Hat Enterprise 4.0 

- 64-bit/32-bit Linux Red Hat Enterprise 4.0 

- 64-bit XP professional 

- 32-bit Vista business 

- 64-bit SUSE 10 

- 64-bit/32-bit Linux Red Hat Enterprise 5.0 support 

- 64-bit Windows Vista support 

- 32-bit SUSE 10 support 

New Features 

- Xilinx ISE Design Suite 11.1 software support 

- Removed DIRT strings and associated RLOC_ORIGIN constraints from the Virtex-5 DDR2 SDRAM UCF file. ISE 11.1 properly places and routes this logic without the DIRT Strings and RLOC_ORIGIN constraints. See the MIG User Guide for full details. 

- Replaced IDELAYCTRL constraints with the new IODELAY_GROUP constraints for Virtex-5 designs. 

- Replaced usage of DCMs with PLLs in Virtex-5 designs. Replaced GUI "Use DCM" option with "Use PLL" option. 

- Verify UCF and Update Design support for Virtex-5 Multi-Controller designs. 

- Verify UCF and Update Design support various UCF syntaxes and are now case insensitive. 

- Enhanced Controller Options page in the GUI. 

- Divided FPGA Options page for Virtex-5 designs into two pages ("FPGA Options" and "Extended FPGA Options"). 

- Removed "Preset Configurations" option from the GUI. 

- Removed unchangeable Mode Register settings from the GUI and combined the changeable Mode Registers settings into a single GUI page ("Memory Options"). 

- MIG GUI closes after clicking "Generate" ("Finish" page has been removed). 

- Added "Class for Data" option to Spartan-3 Generation designs. 

- Added ability to set WASSO limits for Spartan-3 Generation designs. 

- MIG output is compatible with CORE Generator's new directory structure. 

- DCI is now applied with respect to the group enabled for DCI (i.e., DQ/DQS or Address/Control), rather than according to the I/O direction of the signal. As a result, DM is now grouped with DQ/DQS, rather than Address/Control (as in previous releases). 

- Reduced the delay in selecting banks on the Bank Selection page for Multi-Controller designs. 

Resolved Issues 

DDR2 SDRAM Virtex-5  

- (Xilinx Answer 31802) MIG v2.3 - Virtex-5 DDR2 Multi-Controller: Example_Design and User_Design pin-outs do not match 

-- CR 478869 

- (Xilinx Answer 31771) MIG v2.3 - Virtex-5 DDR2 SDRAM Dual Rank - "ERROR: tRFC maximum violation during No Op occur in simulation" 

-- CR 481246 

- (Xilinx Answer 32004) MIG v2.3, Virtex-5 DDR2 - Incorrect directed routing constraints for Virtex-5 TXT devices when center column banks are used 

- Multi controller simulations work with x16 Qimonda memory parts. 

-- CR 498877 

- Added synthesis constraint "syn_preserve=1" for dm_ce primitive. 

-- CR 494895 

- "IOB=TRUE" attribute is replaced with new "IOB=FORCE" attribute. 

-- CR 482871 

- Resolved an issue with the Bank Management logic to properly replicate bank_valid_r. 

-- CR 469871 

DDR SDRAM Virtex-5  

- (Xilinx Answer 31588) MIG v2.3 Virtex-5 DDR SDRAM - Simulation will remain in reset if the value of the parameter RST_ACT_LOW is changed from "1" to "0" in the simulation test bench (sim_tb_top.v/.vhd) 

- CR 481244 

- "IOB=TRUE" attribute is replaced with new "IOB=FORCE" attribute. 

-- CR 482871 

QDRII SRAM Virtex-5  

- (Xilinx Answer 31580) MIG v2.3 Virtex-5 QDRII, DDRII, Multi-Controller - Provided active high reset logic does not work properly in simulation 

- Resolved issues within the phy_en .v/.vhd module to start the stage3 calibration using the appropriate srl_count value. This issue, in previous MIG versions, could cause the data between the two CQ bytes to not match after second stage calibration. 

- CR 504310 

- Command signals do not toggle after reset is de-asserted. 

-- CR 498610 

- "IOB=TRUE" attribute is replaced with new "IOB=FORCE" attribute. 

-- CR 482871 

DDRII SRAM Virtex-5  

- (Xilinx Answer 31580) MIG v2.3 Virtex-5 QDRII, DDRII, Multi-Controller - Provided active high reset logic does not work properly in simulation 

DDR2 SDRAM Virtex-4 Direct Clocking 

- (Xilinx Answer 31797) MIG v2.3 Virtex-4 DDR/DDR2 Direct Clocking - Extra IDELAYCTRL instance LOC causing WARNING:Place:851  

-- CR 480208 

- "IOB=TRUE" attribute is replaced with new "IOB=FORCE" attribute. 

-- CR 482871 

- Tri-state enable signal is turned on a half clock cycle earlier. 

-- CR 457315 

DDR2 SDRAM Virtex-4 Serdes Clocking  

- "IOB=TRUE" attribute is replaced with new "IOB=FORCE" attribute. 

-- CR 482871 

- Deleted the parameters Tbit_straddle and Tbit_straddle_1 from the read_data_timing spreadsheet. 

-- CR 481259 

- Added "IOB = FORCE" constraints in VHDL code for address, command and data tri-state. 

-- CR 505255 

DDR SDRAM Virtex-4  

- (Xilinx Answer 31797) MIG v2.3 Virtex-4 DDR/DDR2 Direct Clocking - Extra IDELAYCTRL instance LOC causing WARNING:Place:851  

-- CR 480208 

- "IOB=TRUE" attribute is replaced with new "IOB=FORCE" attribute. 

-- CR 482871 

QDRII SRAM Virtex-4  

- Command signals do not toggle after reset is de-asserted. 

-- CR 498610 

- "IOB=TRUE" attribute is replaced with new "IOB=FORCE" attribute. 

-- CR 482871 

DDRII SRAM Virtex-4  

- Command signals do not toggle after reset is de-asserted. 

-- CR 498610 

- "IOB=TRUE" attribute is replaced with new "IOB=FORCE" attribute. 

-- CR 48287 

DDR/DDR2 SDRAM Spartan-3  

- (Xilinx Answer 31801) MIG v2.3 Spartan-3A Starter Kit - When running the ISE project output by create_ise.bat, Translate fails with ERROR:ConstraintSystem:59  

-- CR 478919 

- (Xilinx Answer 31591) MIG v2.3 Spartan-3 Generation DDR/DDR2 SDRAM - Incorrect hierarchy for the fifo_we_clk constraint in the provided user_design UCF  

-- CR 480929 

- (Xilinx Answer 31734) MIG v2.3 Spartan-3 Generation DDR2 SDRAM - tRAS and tRFC specifications are violated for certain memory parts  

-- CR 484933 

- Corrected the UCF RLOC_ORIGIN constraints for xc3s1400a-ft256 device when top bank is selected for System Clock. 

-- CR 504837 

- Corrected the cal_ctl AREA_GROUP range in UCF file for devices xc3s50a-ft256 and xc3s50an-ftg256 when X4 memory part is selected for bank3. 

-- CR 504836 

- "IOB=TRUE" attribute is replaced with new "IOB=FORCE" attribute. 

-- CR 482871 

- Proper bit width is assigned to row_address1 in the addr_gen module. 

-- CR 479364 

- The example_design (synthesizable testbench) now toggles all data bits, expanding the testing coverage. 

-- 478022 

- Added UCF constraints for TS_CLK90 to TS_DQS_CLK for Spartan-3 Generation designs. 

-- CR 480282 

Updates to MIG User Guide  

- Added more information on QDR2 PCB guidelines to Appendix section. 

-- CR 499760  

-- CR 504682  

- Added clarification on trace matching requirements to Memory Implementation Guidelines of Appendix A. 

-- CR 491957  

- Added separate pin assignment rules in Appendix A for Virtex-4 and Virtex-5 QDRII designs. 

-- CR 496617  

- Appendix A section modified that Loop back signal is required only for Spartan designs. 

-- CR 491299  

- Added separate section "MIG integration in ISE" in Chapter 1. 

-- CR 473932  

- Moved information from simulation_help document to the MIG User Guide. 

-- CR 496413  

- Removed support for 72-bit DIMMs from Table 8-17 for Spartan-3A DSP FPGAs. 

-- CR 497709  

- Removed comments noting the XIL_ROUTE_ENABLE_DATA_CAPTURE environment variable. This is no longer required. 

-- CR 490624  

- Added notes as to why it is not required to use the signals auto_ref_req and refresh_done signals for Spartan-3 designs in the example_design test bench module. 

-- CR 493312  

- Information from (Xilinx Answer 31107) is moved to MIG user guide. 

-- CR 493211  

- Provided information on how to change the FIFO threshold values. 

-- CR 470112  

- Updated the Write and Read command sequence that the controller follows with respect to the FIFO status signals in "Limitations" section of Virtex-4 QDRII SRAM designs. 

-- CR 490757  

- Added description about write data pattern, address locations and the number of bursts used in synthesizable test bench for every design. 

-- CR 478024  

- Added description about driving unused bits from user interface. 

-- CR 477483  

- Added more description on user interface clocks. 

-- CR 499126  

- Added reference to clocking scheme section in User interface clocks section for details. 

-- CR 492683  

- Virtex-5 ODT description chapter has references to "Capturing the Last Data of Read Burst" section in XAPP858. 

-- CR 496238  

- Added detailed description on ODT0, ODT1 and CS0, CS1 for dual-rank DIMMs. 

-- CR 491649  

- Removed Dual-Rank DIMM from unsupported features list of Virtex-5 DDR2 SDRAM. 

-- CR 491434  

- Updated the "Required UCF and HDL Modifications for Pinout Changes" section. 

-- CR 476819  

- Added description of chip select bit within the af_addr bus for Virtex-5 DDR2 SDRAM design. 

-- CR 476818  

MIG Tool  

- (Xilinx Answer 31606) MIG v2.3, Virtex-5 DDR2 - Are CLK and CLK90 related?  

-- CR 481527 

- (Xilinx Answer 31772) MIG v2.3 - Known Issues for Verify UCF with Spartan-3 Generation devices 

-- CR 506103 

-- CR 480930 

-- CR 480928 

-- CR 480927 

- (Xilinx Answer 31590) MIG v2.3 - Memory parts created using the Create Custom Part feature are not visible in the GUI after relaunching MIG 

-- CR 459684 

-- CR 487931 

- (Xilinx Answer 31807) MIG v2.3 - Why does MIG crash after uploading my mig.prj and UCF to the "Update Design" tool?  

-- CR 478340 

-- CR 491681 

- (Xilinx Answer 31578) MIG v2.3 DDR2 SDRAM - Simulating with Qimonda models causes "Memory Allocation Failure" error 

-- CR 481248 

- Output drive strength option is enabled for the following DDR2 SDRAM memory parts - MT47H64M8XX-3, MT47H64M8XX-5E, MT47H64M8XX-25E-IT, MT8HTF6464AY-667 

-- CR 504835 

- Renamed Sheet1 and Sheet2 of Read_data_timing.xls in docs folder of MIG output to IODELAY_HIGH_Mode and 

IODELAY_NORMAL_Mode for Virtex-5 designs. 

-- CR 503008 

- Corrected the CLK_WIDTH value for the following DDR2 SDRAM memory parts. 

MT9HTF12872CHY-53E, MT9HTF12872CHY-667, MT16HTF25664HY-40E, MT16HTF25664HY-53E, MT16HTF25664HY-667. 

-- CR 502733 

- Virtex-4 SERDES DDR2 SODIMM/UDIMM frequency support is reduced to a max of 267MHz. 

-- CR 501550 

- MIG compares speed grade and package for Compatible FPGAs. 

-- CR 500794 

- Corrected the Max data width for XC3S5000FG676 device. 

-- CR 499253 

- Resolved the Verify UCF false warning message on rst_dqs_div signal for Spartan designs. 

-- CR 498903 

- MIG searches for the Custom Memory part in both output directory path and mig.prj path. 

-- CR 493688 

- MIG generates valid project file mig.prj in batch mode for already generated design with same component name and output folder. 

-- CR 493686 

- Fixed instantiation template issue for .vho files. 

-- CR 493054 

-- CR 481247 

- After clicking "Generate," MIG will close and not point to the path "tmp/_cg". 

-- CR 491529 

- For PPC440 designs, DDR2_RESET_N signal is allocated under Address group. 

-- CR 491079 

- Changed the group name of the "Address" to "Address/Control" on Bank selection screen. 

-- CR 490909 

- Corrected the X_CORE_INFO attribute tag name for Virtex-4 and Virtex-5 DDR SDRAM designs. 

-- CR 488618 

- Fixed unexpected configuration warning messages in Bank Selection page of MIG GUI for Spartan-3 Generation designs. 

-- CR 483278 

- Reduced Drive Strength is supported for DDR SDRAM and DDR2 SDRAM memories from MIG GUI. 

-- CR 482795 

- Fixed an issue when using the synthesis option "optimize_primitives" with Virtex-5 multiple interface designs. 

-- CR 481356 

- Resolved the pin allocation issues related to VRP/VRN for Virtex-5 Multi-Controller and multiple interface designs. 

-- CR 481353 

- MIG outputs Xilinx reference board files in "Component Name" directory. 

-- CR 478102 

- create_ise.bat file includes separate comment delimiters for Linux and Windows versions. 

-- CR 475066 

- MIG removes previously implemented files from PAR folder when ise_flow.bat is executed.  

-- CR 474031 

- Pin allocation algorithm is improved to reduce the pin allocation time for multi controller designs. 

-- CR 469244 

- Resolved issues with having to click options twice in GUI. 

-- CR 459772 

- When a MIG design is generated from Coregen within ISE, ISE will not overwrite the xmdf.tcl file when ISE is closed. 

-- CR 457612 

- New memory parts created using "Create Custom Part" are stored in project path area. 

-- CR 448842 

- MIG designs created with a Custom Part using the MT47H16M16XX-37E as the base part now properly pass all timing parameters during functional simulation 

-- 510254 

- MIG properly sets the CLK_WIDTH for MT16HTF25664HY devices 

-- 507100 

- MIG properly verifies Spartan-3 DDR/DDR2 designs against the +5/-6 tile rule. This verifies DQ bits are placed within 5 tiles above or 6 tiles below the associated DQS bit placement. 

-- 506013 

Known Issues  

(Xilinx Answer 31579) MIG v2.3, v3.0 Virtex-5 QDRII - "ERROR:Place:899 - The following IOBs use DCI and have been locked to the I/O bank #" 

(Xilinx Answer 32318) MIG v3.0, Virtex-5 QDRII - Design does not complete calibration in hardware when using Synplify Pro 9.6.2 as the synthesis tool 

(Xilinx Answer 32319) MIG v3.0 - A ".ise" project is not successfully created after I run the create_ise.bat file 

(Xilinx Answer 32320) MIG 3.0 - Issues can occur when generating/regenerating a MIG project with the same component name 

(Xilinx Answer 32375) MIG 2.3, 3.0, Virtex-5 QDRII - Potential for small margin between the CQ and FPGA clock after stage 2 calibration for frequencies between 125 - 250 MHz 

(Xilinx Answer 32475) MIG v3.0, Spartan-3 Generation DDR/DDR2 - Known issues with Verify UCF and Update Design 

(Xilinx Answer 32449) MIG v2.3, v3.0 Spartan-3 Generation DDR/DDR2 - Complete Pin Allocation Rules