Hardware Architecture of the Platform¶

Introduction¶

This section describes the hardware block design components implemented in Programmable Logic (PL).

The PL design read data from the PMOD GPS Receiver to get the GPS time from Global Navigation Satellite System (GNSS). The platform uses AXI UART Lite IP to interface with the PMOD Receiver’s UART interface for getting the GPS data in NMEA format. The 1PPS signal from the PMOD receiver is connected to PS GPIO via EMIO pins. Gigabit Ethernet MAC (GEM) Controller (GEM0,GEM1) is enabled in the PS to transmit, receive PTP packets or ethernet traffic.

The following figure shows the top-level hardware architecture of the reference design.

Hardware Architecture block diagram

PMOD GPS Receiver¶

The following figure shows the PMOD GPS receiver

GPS receiver has

UART interface : Provides GPS time and GPS Coordinate data in NMEA format.
1PPS output : A pulse is sent out at every one second .

PMOD GPS Receiver

For more information on the Digilent PMOD Receiver PMOD GPS Receiver Reference Manual

AXI UART LITE¶

The LogiCORE™ IP AXI UART Lite core converts AXI4 Lite register transactions to RS232 signaling. PMOD GPS receiver provides GPS time and GPS Coordinate data in NMEA format using the embedded UART interface. AXI UART LITE IP has UART controller to read data from PMOD receiver and convert it into AXI4 Lite register transactions to be read by the PS.

For more information on the IP refer to PG 142

Clocks and Resets¶

Clocks¶

The following table identifies the main clocks of the PL design, the source, clock frequency, and the function.

Clock	Clock Source	Clock Frequency	Function
pl_clk_0	PL Fabric Clock	100 MHz	Clock source for AXI Interconnect, AXI UART lite and AXI GPIO

Resets¶

The following table summarizes the resets used in this design.

Reset Source	Function
pl_resetn0	PL reset for proc_sys_reset modules
rst_clk_wiz_100M	Synchronous resets w.r.t 100M clock domain for AXI interconnect, AXI UART lite and AXI GPIO.

Resource Utilization¶

The resource utilization numbers of the platform post implementation is reported in the table below.

Resource	Utilization	Available	Utilization %
LUT	410	117120	0.35
LUTRAM	62	57600	0.11
FF	558	234240	0.24
IO	5	189	2.65
BUFG	3	352	0.85
MMCM	1	4	25

Next Steps¶

Application Deployment
Software Architecture of the Platform
Go back to the KR260 SOM GPS-1588-PTP App Start Page