Xilinx Parallel Cable IV
DS097 (v2.5) May 14, 2008 www.xilinx.com
Product Specification 8
R
Status LED
The Status LED indicates one of two possible conditions as
shown in the following table.
Automatic I/O Voltage Sensing
Although JTAG configuration pins have typically operated at
3.3V or 5.0V, new devices support voltages as low as 1.5V.
Voltage levels for Slave-Serial configuration pins follow the
respective I/O bank voltage, which can be in the range from
1.5V to 5.0V. SPI pin voltage levels are the same as the SPI
device power supply voltage which is typically 3.3V or 2.5V.
Consequently, the PC4 output buffers must be capable of
driving at the voltage level expected by the receiving
devices. The V
REF
pin on the target device is used to bias
the PC4 output buffers.
A sensing circuit continuously monitors the V
REF
pin. If
V
REF
drops below 1.3V DC, all output buffers are 3-stated to
avoid any possible damage when connected to a non-
powered target system.
All pins are protected against continuous shorts to ground
or voltages up to 5.5V DC.
IEEE 1284 Cable Specifications
Level 1 compliant host ports are designed to operate over a
maximum cable length of 10 ft. Level 2 compliant host ports
operates over a maximum cable length of 33 ft. PC4 uses a
Level 2 compliant cable interface buffer.
For more cable information, see the following web site:
www.xilinx.com/products/design_resources/config_sol/
Signal Integrity Issues
The PC4 uses high slew rate buffers to drive TCK, TMS, and
TDI. Users should pay close attention to proper PCB layout
and signal termination to avoid transmission line effects.
Users are encouraged to refer to the Xilinx
"Signal Integrity"
documentation and the application note
XAPP361, Planning
for High Speed XC9500XV Designs, on the Xilinx web site.
PC4 Operating Characteristics
Absolute Maximum Ratings
Recommended Operating Conditions
Ordering Information
The device number is HW-PC4.
LED State Operating Condition
Solid Green Power available to POD and V
REF
detected.
Solid Amber Power available to POD but no V
REF
detected.
Notes:
1. If LED does not turn on, check to make sure that power has been
connected to the PC4 either through the mouse/keyboard port or
through the external power connector.
Symbol Description Value Units
V
CC
Supply Voltage 5.5 V
T
A
Operating Temperature Range 0• to +70• C
T
STG
Storage Temperature Range –40• to +85• C
P
D
Power Dissipation 750 mW
I
OUT
DC Output Current (TDI, TCK, TMS, INIT) ±32 mA
Symbol Parameter Conditions Min Max Units
V
CC
DC Supply Voltage External P/S 4.75 5.25 V
V
REF
Target Reference Voltage 1.5 5.5 V
I
CC
Operating Current 60 100 mA
I
REF
Reference Current 6.0 15.0 mA
V
OH
High Level Output Voltage V
REF
= 3.3V DC, I
OH
= –4 mA 2.7 – V
V
OL
Low Level Output Voltage V
REF
= 3.3V DC, I
OL
= +4 mA – 0.36 V
V
IH
High Level Input Voltage V
REF
> 1.5V 1.2 – V
V
IL
Low Level Input Voltage V
REF
> 1.5V – 0.4 V
