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Connecting Cable to
Target System
The cable draws its power from the target system through VCC and GND. Therefore,
power to the cable, as well as to the target FPGA, must be stable. Do not connect any
signals before connecting VCC and GND. Connect the programming dongle to your
printer parallel port. Connect the other end with 10-pin header to your target system
(Figure 1). Your target system should have the 10-pin header pin layout as follow in
order to match the download cable (Figure 2). The pin 9 of the 10-pin header on the tar-
get system is a key pin; therefore, it is cut off. The control signals generated by the
software are fed to the header. The programming algorithms written by Atmel can be
used to program an AT17 device in-system.
Figure 1. In-System Programming Application
Parallel Port
Target System
FPGA
FPGA
PC
ATDH2225
In-System Programming
Configurator In-System
Connector Header
AT17C/LVXXX
Configurator
Programming Cable
(Direct connects to PC)
Figure 2. In-System Programming Header
2
ATDH2225 FPGA
DATA
SCLK
NC
GND
NC
1
3
5
7
9
2
4
6
8
10
CE
RESET/OE
NC
VCC
(SER_EN)GND
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