On Sat, Jan 05, 2013 at 09:41:31AM +0100, S?bastien Bourdeauducq wrote: > Since that SDRAM part on that board might operate at up to 200MHz > (check which speed grade you have), I'd recommend you use > milkymist-ng and its memory controller (ASMIcon) with a 1:2 > frequency ratio, e.g. run the SoC at 83MHz and the SDRAM at 166MHz. > > http://www.winbond.com/NR/rdonlyres/16898431-2772-4CEA-8474-7E4AA855555F/0/W9825G6JH.pdf > https://github.com/milkymist/milkymist-ng > > You will basically need to: > * modify the PHY so that the data serialization ratio becomes 2 > (instead of currently 4 for DDR). > * adapt the clocking accordingly. > * check the timing and other ASMIcon parameters. You have 2 phases > and 32-bit data.
I think I got most of this, but I appear to have gone the wrong direction with the multiple phases. I thought I could remove the 'p1' signals, but this seems broken. with: https://bitbucket.org/dahozer/xulamist/commits/b6343bdc8613f1ea1723e04c6bb7e17056db4ad8 I get: Elaborating module <s6sdrphy(NUM_AD=4'b1101,NUM_BA=2'b10,NUM_D=6'b100000)>. Elaborating module <OSERDES2(DATA_WIDTH=2,DATA_RATE_OQ="SDR",DATA_RATE_OT="SDR",SERDES_MODE="NONE",OUTPUT_MO DE="SINGLE_ENDED")>. Elaborating module <ISERDES2(DATA_WIDTH=2,DATA_RATE="SDR",BITSLIP_ENABLE="FALSE",SERDES_MODE="NONE",INTERFAC E_TYPE="RETIMED")>. ERROR:HDLCompiler:1532 - "/afs/hozed.org/user/hozer/src/xess/xulamist/verilog/s6sdrphy/s6sdrphy.v" Line 166: Cannot assign to a constant value ERROR:HDLCompiler:1532 - "/afs/hozed.org/user/hozer/src/xess/xulamist/verilog/s6sdrphy/s6sdrphy.v" Line 167: Cannot assign to a constant value Module s6sdrphy remains a blackbox, due to errors in its contents WARNING:HDLCompiler:1499 - "/afs/hozed.org/user/hozer/src/xess/xulamist/verilog/s6sdrphy/s6sdrphy.v" Line 18 : Empty module <s6sdrphy(NUM_AD=4'b1101,NUM_BA=2'b10,NUM_D=6'b100000)> remains a black box. ERROR:HDLCompiler:267 - "/afs/hozed.org/user/hozer/src/xess/xulamist/build/soc.v" Line 5669: Cannot find por t sd_clk_out on this module ERROR:HDLCompiler:267 - "/afs/hozed.org/user/hozer/src/xess/xulamist/build/soc.v" Line 5670: Cannot find por t sd_clk_fbin on this module ERROR:HDLCompiler:267 - "/afs/hozed.org/user/hozer/src/xess/xulamist/build/soc.v" Line 5673: Cannot find por t sd_ce_n on this module ERROR:HDLCompiler:267 - "/afs/hozed.org/user/hozer/src/xess/xulamist/build/soc.v" Line 5680: Cannot find por t dfi_address_p0 on this module ERROR:HDLCompiler:267 - "/afs/hozed.org/user/hozer/src/xess/xulamist/build/soc.v" Line 5681: Cannot find por t dfi_bank_p0 on this module ERROR:HDLCompiler:267 - "/afs/hozed.org/user/hozer/src/xess/xulamist/build/soc.v" Line 5682: Cannot find por t dfi_cas_n_p0 on this module _______________________________________________ http://lists.milkymist.org/listinfo.cgi/devel-milkymist.org IRC: #milkymist@Freenode
