Hardware Description
AT18F-DK3 Configurator Development Kit User Guide
2-7
3685A–CNFG–04/08
To create a JTAG daisy chain using multiple ATF15xx-DK3 Base Boards of the AT18F-DK3 kits, the
TDO Selection Jumper, labeled JP-TDO, must be set to the appropriate position. For all the devices in
the daisy chain except the last device, this jumper must be set to the “TO NEXT DEVICE” position. For
the last device in the chain, this jumper must be set to the “TO ISP CABLE” position. When this jumper is
in the “TO NEXT DEVICE” position, the TDO of that particular JTAG device will be connected to the TDI
of the next JTAG device in the chain. When this jumper is in the “TO ISP CABLE”, the TDO of that device
will be connected to the TDO of the JTAG 10-pin connector, which will allow the TDO signal of the that
device in the chain to be transmitted back to the host PC with the ISP software.
below is a cir-
cuit diagram of the JTAG connectors and the JP-TDO jumper. For a single device setup, the position of
the JP-TDO jumper must be set to “TO ISP CABLE”.
Figure 2-7.
Circuit Diagram of the JTAG ISP Connectors and TD Jumper
