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Figure A-6 shows a typical schematic of the target TAP connector with termination resistors. The
1K pull-up resistors should connect to the target Vcc supply corresponding to the interface voltage
(programmable on the PCI-1149.1/Turbo from 1.25 to 3.3 V). Recommended resistor values are
+/- 5%.
Vcc
1K
Vcc
1K
Vcc
1K
Vcc
1K
Vcc
1K
Vcc
Vcc
1K
1K
TRST*
to all bounday-scan devices
to TDI of first device
in the chain
from TDO of last device
in the chain
TDI
TDO
33
TMS
to all bounday-scan devices
TCK
to all bounday-scan devices
to SPI device /
Flash Write_Strobe* pin(s)
to SPI device(s)
from SPI device(s) /
Flash Ready/Busy* pin(s)
for voltage measurement /
voltage short testing
for voltage measurement /
voltage short testing
The 33 ohm resistor
should be placed
physically close to the
device pin that drives
this signal
Write_Strobe* / SPI_CS2* / GPIO1
SPI_SCK / GPIO2
Ready_Busy* / SPI_SDO / GPIO3
UUT Power Test Point 1
UUT Power Test Point 2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Vcc
Vcc
1K
1K
SPI_SDI
SPI_CS1*
to SPI device(s)
to SPI device
Figure A-6. 20-pin TAP Connector Schematic for SPI
A-10
Recommended Target Connectors