wsat verion 2010.01 can communicate via this interface with the decoder.
pin left on schematic | connect? | description |
---|---|---|
+5V | depends | See chapter 'Power' |
ctrl[7:0] | Only if channel selection needed | see chapter "Selection channels etc." |
(no text, from RD of FT245R) | Not if no channel selection needed | TBD |
DIO[7:0] | Yes | see table 1 |
is_out | Only if channel selection needed | TDB; connect to pin 63 buffer-FPGA = pin 14 par. port connector |
rd_off | If NO channel selection: to +5V | see chapter "Selection channels |
clk | Yes | see table 1 |
readyn | Yes | see table 1 |
r_clk_n | Yes | see table 1 |
13@FPGA means: pin 13 of buffer-FPGA 17@CONP means: pin 17 of connector near parallelport 3@CON10 means: pin 3 of connector CON10Tabel 1: Connection decoder with USB-interface: Data from decoder to USB.
decoder-PCB | USB-PCB | description |
---|---|---|
13@FPGA | r_clk_n | lees-klok |
17@CONP | readyn | 0=data in decoder |
59@FPGA | D0 | HRPT-data |
3@CON10 | D1 | HRPT-data |
2@CON10 | D2 | HRPT-data |
1@CON10 | D3 | HRPT-data |
3@CON9 | D4 | HRPT-data |
1@CON9 | D5 | HRPT-data |
3@CONP | D7 (!! See note below!!) | !!!Via R=100 ohm!!! |
9@EPROM | clk | 666/1300 kHz |
decoder-PCB | Connect with | description |
---|---|---|
69@FPGA | GND | set to 2x6 mode |
2@CON9 | 3@CONP | connect r_clk with rdy_nib |
Tabel 3: No channel selection by PC (all channels active)
decoder-PCB | Connect with | Description |
---|---|---|
18@CONP | GND | output always active |
1...6 @CON1 | to +5V | all channels active |
jumper CON2 pin1-2 | remove | manual selection 'on' |
power | to do | comments |
---|---|---|
Power USB-interface and decoder from USB | Add jumper J1 (fig. 1)
Remove jumper J3 (fig. 1) Connect 5V-pin to 5V decoder Don't connect an external power unit to decoder! | Disadvantage: decoder altijd On if PC is on. |
Power USB-interface and decoder from decoder | Remove jumper J1 (fig. 1)
Add jumper J3 (fig. 1) Connect 5V-pin to 5V decoder Use power unit decoder | recommended |
Power USB-interface from USB connector
Power decoder using it's own power unit | Add jumper J1 (fig. 1)
Remove jumper J3 (fig. 1) | Disadvantage: "false" currents if decoder is powerd and USB not or vice versa |
About last possibility: The "false currents" go via the connections between USB-interface and decoder. As a result decoder-LEDs may go 'On' while decoder isn't powered. It is possible that after some time decoder and/or USB chip will degrade.