DX TM1638 Display

I'm using the VHDL code from Hamster on my papilio board, and it works. Thanks Hamsterworks!

Looks like the pinning of the DX display cable as described by Hamster has changed (or was wrong). The silkscreen on my DX display looks like this:

Gnd	Vcc
DIO	CLK
STB1	STB0
STB3	STB2
STB5	STB4

So it looks like hamster's pinning has DIO/Data and CLK swapped, and the even Strobes were off by 2. Also, it's Strobe0 that controls this board (not Strobe1), the other strobes pass through to the 'out' connector.

I notice that after I power down my papilio board (and the TM1638), I have to send the .bit file several times to the board. Strange.

I'm using this constraints.ucf file for my papilio board:

# Crystal Clock - use 32MHz onboard oscillator
NET "clk" LOC = "P89" | IOSTANDARD = LVCMOS25 | PERIOD = 31.25ns ;

NET "d_data"   LOC = "P86" | IOSTANDARD=LVCMOS33; 
NET "d_clk"    LOC = "P85" | IOSTANDARD=LVCMOS33; 
NET "d_strobe" LOC = "P84" | IOSTANDARD=LVCMOS33; 

But other than that, Hamsters code works.