May 18, 2024, 04:14:59 PM

HOWTO JTAG<-->A20 pin connection?

Started by elia, June 03, 2016, 06:20:04 PM

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elia

How you should connect JTAG ARM-USB-OCD-H and Olinuxino A20 Micro?

A20 Micro has 4 JTAG lines (default script.bin enabled: jtag_enable = 1):
  PB14 pin 26/GPIO3 MUX3 = JTAG_MS0
  PB15 pin 28/GPIO3 MUX3 = JTAG_CK0
  PB16 pin 30/GPIO3 MUX3 = JTAG_DO0
  PB17 pin 32/GPIO3 MUX3 = JTAG_DI0

ARM-USB-OCD-H has many JTAG lines:
PIN # Signal name
1 VREF
2 VREF
3 TTRST_N
4 GND
5 TTDI
6 GND
7 TTMS
8 GND
9 TTCK
10 GND
11 TRTCK
12 GND
13 TTDO
14 GND
15 TSRST_N
16 GND
17 NOT CONNECTED
18 GND
19 TARGET SUPPLY
20 GND


It is enough to make this direct JTAG connection?
ARM-USB-OCD-H  to A20_MICRO
TTMS -> JTAG_MS0
TTCK -> JTAG_CK0
TTDI <- JTAG_DO0
TTDO -> JTAG_DI0
GND  to GND

Thank you