Updated constraints.

1 files changed, 15 insertions, 34 deletions

diff --git a/ucf/alpha_fmc.ucf b/ucf/alpha_fmc.ucf
index 5e71c64..efefa76 100644
--- a/ucf/alpha_fmc.ucf
+++ b/ucf/alpha_fmc.ucf
@@ -7,7 +7,7 @@
 #
 #
 # Author: Pavel Shatov
-# Copyright (c) 2016, NORDUnet A/S All rights reserved.
+# Copyright (c) 2016, 2018 NORDUnet A/S All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
@@ -39,23 +39,23 @@
 
 
 #--------------------------------------------------------------------------------
-# GCLK Timing (fixed at 50 MHz)
+# GCLK Timing (fixed at 50 MHz) - NOT USED
 #--------------------------------------------------------------------------------
-NET  "gclk_pin" TNM_NET = TNM_gclk;
-TIMESPEC  TS_gclk = PERIOD TNM_gclk 20 ns HIGH 50%;
+#NET  "gclk_pin" TNM_NET = TNM_gclk;
+#TIMESPEC  TS_gclk = PERIOD TNM_gclk 20 ns HIGH 50%;
 
 
 #-------------------------------------------------------------------------------
 # FMC_CLK Timing (can be up to 90 MHz)
 #-------------------------------------------------------------------------------
 NET  "fmc_clk" TNM_NET = TNM_fmc_clk;
-TIMESPEC  TS_fmc_clk = PERIOD TNM_fmc_clk 90 MHz HIGH 50%;
+TIMESPEC  TS_fmc_clk = PERIOD TNM_fmc_clk 11.111 ns HIGH 50%;
 
 
 #-------------------------------------------------------------------------------
 # FPGA Pinout
 #-------------------------------------------------------------------------------
-#

+#
 NET "led_pins<0>" LOC = "U3";
 NET "led_pins<1>" LOC = "T1";
 NET "led_pins<2>" LOC = "W22";
@@ -145,8 +145,9 @@ NET  "mkm_do"          LOC = "Y1"   | IOSTANDARD = "LVCMOS33" ; # MKM_FPGA_MISO
 # FMC Input Timing
 #-------------------------------------------------------------------------------
 #
-# The following timing values were derived from pages 173-175 of the STM32F429
-# datasheet. Control signals NE1, NL and NWE all have different timing values.
+# The following timing values were derived from Figures 61-62 and Tables 96-97
+# (pages 180-182) of the STM32F429 datasheet ("DocID024030 Rev 10").
+# Control signals NE1, NL and NWE all have different timing values.
 # Instead of writing individual constraints for every control signal, the most
 # strict constraint is applied to all control signals. This should not cause
 # any P&R issues, since Spartan-6 (and Artix-7) can handle 90 MHz easily.
@@ -154,10 +155,9 @@ NET  "mkm_do"          LOC = "Y1"   | IOSTANDARD = "LVCMOS33" ; # MKM_FPGA_MISO
 # NOE signal is not constrained, since it drives "T" input of IOBUF primitive.
 #
 # Data and Address buses also have different timings, with Data bus timing being
-# more strict. The same approach is used here, i.e. timing for Data bus is
-# applied to Address bus too.
+# more strict.
 #
-# Oh, and stupid datasheet doesn't explicitly specify hold time for the data bus!
+# Oh, and the datasheet doesn't explicitly specify hold time for the data bus.
 #
 
 NET  "fmc_d<*>" TNM = "TNM_FMC_IN_DATA" ;
@@ -167,37 +167,18 @@ NET  "fmc_ne1"  TNM = "TNM_FMC_IN_CONTROL" ;
 NET  "fmc_nl"   TNM = "TNM_FMC_IN_CONTROL" ;
 NET  "fmc_nwe"  TNM = "TNM_FMC_IN_CONTROL" ;
 
-TIMEGRP  "TNM_FMC_IN_DATA"    OFFSET = IN 3.0 ns VALID  6.0 ns BEFORE "fmc_clk" RISING ;
-TIMEGRP  "TNM_FMC_IN_ADDR"    OFFSET = IN 3.0 ns VALID  6.0 ns BEFORE "fmc_clk" RISING ;
+TIMEGRP  "TNM_FMC_IN_DATA"    OFFSET = IN 3.0 ns VALID  8.5 ns BEFORE "fmc_clk" RISING ;
+TIMEGRP  "TNM_FMC_IN_ADDR"    OFFSET = IN 5.5 ns VALID  5.5 ns BEFORE "fmc_clk" RISING ;
 TIMEGRP  "TNM_FMC_IN_CONTROL" OFFSET = IN 5.0 ns VALID 10.0 ns BEFORE "fmc_clk" RISING ;
 
+
 #-------------------------------------------------------------------------------
 # FMC Output Timing
 #-------------------------------------------------------------------------------
-#
-# NWAIT signal is not constrained, since it is polled by STM32.
-#
-
 NET  "fmc_d<*>" TNM = "TNM_FMC_OUT_DATA" ;
 
-TIMEGRP  "TNM_FMC_OUT_DATA" OFFSET = OUT 16.7 ns AFTER "fmc_clk" FALLING;
-
+TIMEGRP  "TNM_FMC_OUT_DATA" OFFSET = OUT 6.0 ns AFTER "fmc_clk" RISING;
 
-#-------------------------------------------------------------------------------
-# CDC Paths
-#-------------------------------------------------------------------------------
-INST  "fmc/fmc_cdc/cdc_fmc_sys/src_ff"     TNM = "TNM_from_fmc_clk";
-INST  "fmc/fmc_cdc/cdc_fmc_sys/src_latch*" TNM = "TNM_from_fmc_clk";
-INST  "fmc/fmc_cdc/cdc_fmc_sys/ff_sync*"   TNM = "TNM_to_sys_clk";
-INST  "fmc/fmc_cdc/cdc_fmc_sys/dst_latch*" TNM = "TNM_to_sys_clk";
-
-INST  "fmc/fmc_cdc/cdc_sys_fmc/src_ff"     TNM = "TNM_from_sys_clk";
-INST  "fmc/fmc_cdc/cdc_sys_fmc/src_latch*" TNM = "TNM_from_sys_clk";
-INST  "fmc/fmc_cdc/cdc_sys_fmc/ff_sync*"   TNM = "TNM_to_fmc_clk";
-INST  "fmc/fmc_cdc/cdc_sys_fmc/dst_latch*" TNM = "TNM_to_fmc_clk";
-
-TIMESPEC  "TS_fmc_clk_2_sys_clk" = FROM "TNM_from_fmc_clk" TO "TNM_to_sys_clk" TIG;
-TIMESPEC  "TS_sys_clk_2_fmc_clk" = FROM "TNM_from_sys_clk" TO "TNM_to_fmc_clk" TIG;
 
 #======================================================================
 # EOF alpha_fmc.ucf