Performance figures UM2448
44/49 UM2448 Rev 6
14 Performance figures
14.1 Global overview
Table 19 gives an overview of the achievable maximal performances with the STLINK-
V3SET on different communication channels. Those performances are also depending on
the overall system context (target included), so they are not guaranteed to be always
reachable. For instance, a noisy environment or the connection quality can impact system
performance.
14.2 Baud rate computing
Some interfaces (VCP and SWV) are using UART protocol. In that case, the baud rate of
STLINK-V3SET must be aligned as much as possible with the target one.
Below is a rule allowing to compute the baud rates achievable by the STLINK-V3SET probe:
• In high performance mode: 384 MHz/prescaler with prescaler = [24 to 31] then
192MHz/prescaler with prescaler = [16 to 65535]
• In standard mode: 192 MHz/prescaler with prescaler = [24 to 31] then 96MHz/prescaler
with prescaler = [16 to 65535]
• In low consumption mode: 96 MHz/prescaler with prescaler = [24 to 31] then
48 MHz/prescaler with prescaler = [16 to 65535]
Note that the UART protocol does not guaranty the data delivery (all the more without
hardware flow control). Consequently, at high frequencies, the baud rate is not the only
parameter impacting the data integrity. The line load rate and the capability for the receiver
to process all the data also affect the communication. With a heavily loaded line, some data
loss may occur at the STLINK-V3SET side above 12
MHz.
Table 19. Achievable maximal performance with STLINK-V3SET on different channels
Board Target voltage
Maximum frequency (in MHz)
SWD JTAG SWV VCP SPI I
2
CCAN
STLINK-V3SET 3.3 24 21 16 16 24 1 1
STLINK-V3SET +
B-STLINK-VOLT
3.3 8 12 12 10 12 1 1
STLINK-V3SET +
B-STLINK-VOLT
1.8 8 8 12 10 12 1 1
STLINK-V3SET +
B-STLINK-ISOL
3.3 8 8 12 10 6 1 1
STLINK-V3SET +
B-STLINK-ISOL
1.8 8 8 12 10 6 1 1
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