ATF15xx-DK3-U Development/Programmer Kit [USER GUIDE]
Atmel-8961A-CPLD-ATF15xx-DK3-U-Development-Kit-UserGuide_072015
12
JTAG ISP Connector and TDO Selection Jumper
The JTAG ISP Connector labeled JTAG-IN, is used to connect the ATF15xx JTAG port pins (TCK, TDI,
TMS, and TDO) through the ISP download cable to the parallel printer (LPT) port of a PC for JTAG ISP
programming of the ATF15xx device. Polarized connectors are used on the ATF15xx-DK3 and ISP
Download Cable to minimize connection problems. The PIN1 label at the bottom of the JTAG ISP
connector indicates the pin 1 position of the 10-pin header and further reduces the chance of
connecting the ISP Download Cable incorrectly.
To the left of the JTAG-IN connector, there are two columns of vias, and they are labeled JTAG-OUT.
They are intended to allow the users to create a JTAG daisy chain to perform JTAG operations to
multiple devices. Users will need to solder the same type of connector as the one used for JTAG-IN
into the JTAG-OUT position in order to utilize this available feature.
To create a JTAG daisy chain using multiple ATF15xx-DK3 boards, 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
position, 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. The figure below is a circuit
diagram of the JTAG connectors and the JP-TDO jumper. The table below lists the pin numbers of the
four JTAG pins for the ATF15xx device in all the available packages.
For a single device setup, the position of the JP-TDO jumper must be set to
TO ISP CABLE
.
Figure 7.
Circuit Diagram of the JTAG ISP Connectors and TDO Jumper
JP-TDO
JTAG-OUT
TDO
TDI
TMS
TCK
1
3
5
7
9
2
4
6
8
10
JTAG-IN
1
3
5
7
9
2
4
6
8
10
VCCIO
VCCIO
R11
4.7K
R12
4.7K
R13
4.7K
R14
10K
3
2
1
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