Cypress FM4 Series - Pins for Debug Purposes

CHAPTER 16: Debug Interface
918 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
2.1 Pins for Debug Purposes
Five pins (TRSTX, TCK, TMS, TDI, and TDO) are assigned to the JTAG and two pins (SWCLK and
SWDIO) are assigned to the serial wire. In addition, a Serial Wire Viewer signal (SWO) that outputs trace
data is assigned.
TMS is shared with SWDIO, TCK is shared with SWCLK, and TDO is shared with SWO.
The following provides a list of pin functions in each debug mode.
Table 2-1 JTAG/Serial Wire/Trace Functions in Debug Mode
Pin
JTAG
Serial Wire/Trace
TCK/SWCLK
TCK (JTAG Clock signal)
SWCLK (Serial Wire Clock signal)
TMS/SWDIO
TMS (JTAG State Mode signal)
SWDIO (Serial Wire Data Input/Output signal)
TDI
TDI (JTAG Data Input signal)
-
TDO/SWO
TDO (JTAG Data Output signal)
SWO (Serial Wire Viewer Output signal)
TRSTX
TRSTX (active-LOW JTAG Reset signal)
-