Segger J-Link User Manual page 21

1.1.3.3 Download speed
The following table lists performance values (Kbytes/s) for writing to memory (RAM):
Hardware
J-Link Rev. 6 — 8
Table 1.2: Download speed differences between hardware revisions
All tests have been performed in the testing environment which is described on Mea-
suring download speed on page 188.
The actual speed depends on various factors, such as JTAG/SWD, clock speed, host
CPU core etc.
1.1.3.4 Hardware versions
Versions 1-3
These J-Links use a 16-bit CISC CPU. Maximum download speed is approximately 150
Kbytes/second.
JTAG speed
Maximum JTAG frequency is 4 MHz; possible JTAG speeds are:
16 MHz / n, where n is 4, 5, ..., resulting in speeds of:
4.000 MHz (n = 4)
3.200 MHz (n = 5)
2.666 MHz (n = 6)
2.285 MHz (n = 7)
2.000 MHz (n = 8)
1.777 MHz (n = 9)
1.600 MHz (n = 10)
Adaptive clocking is not supported.
Target Interface
nTRST is open drain + 4K7 pull up
RESET is open drain
Version 4
Identical to version 3.0 with the following exception:
Target Interface
nTRST is push-pull type
RESET is push-pull type
Version 5.0
Uses a 32-bit RISC CPU.
Maximum download speed (using DCC) is over 700 Kbytes/second.
JTAG speed
Maximum JTAG frequency is 12 MHz; possible JTAG speeds are:
48 MHz / n, where n is 4, 5, ..., resulting in speeds of:
12.000 MHz (n = 4)
9.600 MHz (n = 5)
8.000 MHz (n = 6)
6.857 MHz (n = 7)
J-Link / J-Trace (UM08001)
ARM7
via JTAG
720 Kbytes/s
(12MHz JTAG)
ARM9
via JTAG
550 Kbytes/s
(12MHz JTAG)
© 2004-2009 SEGGER Microcontroller GmbH & Co. KG
21
Cortex-M3
via SWD
180 Kbytes/s
(12 MHz SWD)