6.2.2 Limitations and hardware configuration - ETM trace (CN15)
Limitations: Wi‑Fi
®
, LCD, SAI, FMC A19-22 cannot be used at the same time as TRACE.
If the best performance of ETM is required (84 MHz/98 MHz), refer to Table 4. ETM trace hardware configuration.
Table 4. ETM trace hardware configuration
Signal name Pin name Setting
JTAG / TRACE
(1)
WIFI_SPI4_SCK
PE2
R343
OFF
(2)
FMC_A23 R342
OFF
(2)
TRACECLK R101 ON
WIFI_SPI4_NSS
PE3
R337
OFF
(2)
SAI1_SD_B JP34
OFF
(2)
FMC_A19 R97
OFF
(2)
JTAG_TDO (PB3) R390
OFF
(2)
TRACED0 R93 ON
SAI1_FS_A
PE4
JP26
OFF
(2)
FMC_A20 R88
OFF
(2)
JTAG_TRST (PB4) R372
OFF
(2)
DCMI_D4 R116
OFF
(2)
TRACED1 R340 ON
WIFI_SPI4_MISO
PE5
R69
OFF
(2)
SAI1_SCK_A JP28
OFF
(2)
FMC_A21 R324
OFF
(2)
TRACED2 R71 ON
WIFI_SPI4_MOSI
PE6
R334
OFF
(2)
SAI1_SD_A JP27
OFF
(2)
FMC_A22 R78
OFF
(2)
TRACED3 R80 ON
RGB_LCD_G0
PJ7
R315
OFF
(2)
TRGIN R64 ON
RGB_LCD_B0
PJ12
R259
OFF
(2)
TRGOUT R34 ON
1. Trace configuration is in bold.
2. Remove to avoid stub if necessary.
Remark:
• R69 must be removed to avoid conflict with the WIFI_SPI4_MISO output, but it is also recommended to
remove R343, R337, R116, and R334 to have the best signal quality. With these changes, ETM trace 4-bits
is successfully tested in DDR with the ULINK PRO up to 108MHz (CPU at 280 MHz) but the timing of the
data [3:0] sampling must be adjusted on the ULINK pro: CLK: +0 ns (no change) / D [3:0]: ~ 2.5 ns.
UM2662
External JTAG, SWD, and trace
UM2662 - Rev 1
page 12/95
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