Digilent Arty Z7 - Shield Digital I;O Characteristics

Arty Z7 Reference Manual Transfer Multisort Elektronik / tme.eu 27
Pin Name
Shield Function
Arty Z7 Connection
V_P, V_N
Dedicated
Differential Analog
Input
See Section titled “Shield Analog I/O”
XGND
XADC Analog
Ground
Connected to net used to drive the XADC ground
reference on the Zynq (VREFN)
XVREF
XADC Analog
Voltage Reference
Connected to 1.25 V, 25mA rail used to drive the XADC
voltage reference on the Zynq (VREFP)
N/C
Not Connected
Not Connected
IOREF
Digital I/O Voltage
reference
Connected to the Arty Z7 3.3V Power Rail (See the
“Power Supplies” section)
RST
Reset to Shield
Connected to the red “SRST” button and MIO pin 12 of
the Zynq. When JP1 is shorted, it is also connected to the
DTR signal of the FTDI USB-UART bridge.
3V3
3.3V Power Rail
Connected to the Arty Z7 3.3V Power Rail (See the
“Power Supplies” section)
5V0
5.0V Power Rail
Connected to the Arty Z7 5.0V Power Rail (See the
“Power Supplies” section)
GND, G
Ground
Connected to the Ground plane of Arty Z7
VIN
Power Input
Connected in parallel with the external power supply
connector (J18).
Table 16.1. Shield Pin Descriptions.
16.1 Shield Digital I/O
The pins connected directly to the Zynq PL can be used as general purpose inputs or outputs.
These pins include the I2C, SPI, and general purpose I/O pins. There are 200 Ohm series
resistors between the FPGA and the digital I/O pins to help provide protection against
accidental short circuits (with the exception of the AN5-AN0 signals, which have no series
resistors, and the AN6-AN12 signals, which have 100 Ohm series resistors). The absolute
maximum and recommended operating voltages for these pins are outlined in the table below.
IO26-IO41 and A (IO42) are not accessible on the Arty Z7-10. Also, AN0-AN5 cannot be
used as Digital I/O on the Arty Z7-10. This is due to fewer number of I/O pins being available
on the Zynq-7010 than on the Zynq-7020.
Absolute
Minimum
Voltage
Recommended
Minimum Operating
Voltage
Recommended
Maximum Operating
Voltage
Absolute
Maximum
Voltage
Powered
-0.4 V
-0.2 V
3.4 V
3.75 V
Unpowered
-0.4 V
N/A
N/A
0.55 V
Table 16.1.1. Shield Digital Voltages.
For more information on the electrical characteristics of the pins connected to the Zynq PL,
please see the Zynq-7000 datasheet from Xilinx.