Arty Z7 Reference Manual Transfer Multisort Elektronik / tme.eu 24
Arty Z7 drives this signal from the PGOOD signal of the TPS65400 power regulator in order
to hold the system in reset until all power supplies are valid.
14.2 Program Push Button Switch
A PROG push switch, labeled PROG, toggles Zynq PROG_B. This resets the PL and causes
DONE to be de-asserted. The PL will remain unconfigured until it is reprogrammed by the
processor or via JTAG.
14.3 Processor Subsystem Reset
The external system reset, labeled SRST, resets the Zynq device without disturbing the debug
environment. For example, the previous break points set by the user remain valid after system
reset. Due to security concerns, system reset erases all memory content within the PS,
including the OCM. The PL is also cleared during a system reset. System reset does not cause
the boot mode strapping pins to be re-sampled.
The SRST button also causes the CK_RST signal to toggle in order to trigger a reset on any
attached shields.
15 Pmod Ports
Pmod ports are 2×6, right-angle, 100-mil spaced female connectors that mate with standard
2×6 pin headers. Each 12-pin Pmod port provides two 3.3V VCC signals (pins 6 and 12), two
Ground signals (pins 5 and 11), and eight logic signals, as shown in Figure 15.1. The VCC
and Ground pins can deliver up to 1A of current, but care must be taken not to exceed any of
the power budgets of the onboard regulators or the external power supply (see the 3.3V rail
current limits listed in the “Power Supplies” section).
Figure 15.1. Pmod Port Diagram
Digilent produces a large collection of Pmod accessory boards that can attach to the Pmod
expansion connectors to add ready-made functions like A/D’s, D/A’s, motor drivers, sensors,
and other functions. See www.digilentinc.com for more information.
Each Pmod port found on Digilent FPGA boards falls into one of four categories: standard,
MIO connected, XADC, or high-speed. The Arty Z7 has two Pmod ports, both of which are
the high-speed type. The following section describes the high-speed type of Pmod port.