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Zynq-7000 AP SoC Technical Reference Manual www.xilinx.com 662
UG585 (v1.11) September 27, 2016
Chapter 23: Programmable Logic Test and Debug
- Trigger input 0 (FTMTF2PTRIG[0]) can be used to generate trigger packets.
•Packet Formatter
°
This block is responsible for gathering trace data and formatting the data into trace packets.
In addition to trace packets, the packet formatter can also generate various other types of
packets to convey additional information to the CoreSight system within the PS.
Cycle Count Generator
°
This block is used to provide a binary count value for time stamping packets. This is
achieved by a counter, which is:
- 32-bit, free-running, clocked by CPU_2x
- Pre-scaled by 2^CYCOUNTPRE (range:1 to 32,768)
- Reset by POR, FTMGLBCTRL[FTMENABLE]==0, CoreSight reset request through JTAG
•FIFO
°
The FIFO is used to buffer packets before they are sent to the ATB. The FIFO has these
properties:
- 64-packets deep
- When the FIFO overflows, it signals the packet formatter to generate an overflow packet.
In this case, some trace data is lost.
•ATB Interface
°
This is the interface to the CoreSight ATB, over which packets are sent.
Cross Trigger Interface
°
This block is the interface to the CoreSight ECT system (see Chapter 28, System Test and
Debug).
23.1.3 System Viewpoint
For details on how the FTM is connected to, and interacts with, the rest of the CoreSight system
within the PS, see Chapter 28, System Test and Debug.
23.2 Functional Description
23.2.1 Basic Operation
The PL trace module captures the trace data from the PL. The user supplies the trace data, trace ID,
valid, and clock signals to the FTM at the PL-PS boundary. All data, ID, and valid signals must be
stable on the rising edge of the FTMDTRACEINCLOCK signal for the FTM to correctly sample them.
When FTMDTRACEINVALID is asserted, the PL trace signals are available to the clock domain crossing
interface, which synchronizes the data and ID, and sends them to the packet formatter.