Computex FP-40 - ② JTAG Interface

Technical Information on On-board Flash Programmer FP-40 Aug. 31, 2023 (Second edition)
6
② JTAG interface
The JTAG interface signal table when connected with a 20-pin 2.54mm pitch connector is shown below.
In addition to the standard JTAG signal, FP-40 provides power supply function and external input/output function by
FP-40's original signal. When using FP-40, refer to "About FP-40 unique signals" below for connection.
Signal description
Pin
No.
JTAG I/F FP-40
FP-40 unique
Specifications
Connection
Signal
Input/
Output
*1
Signal
Input/
Output
*1
1
VTref
Output
VTref
Output
-
Connect the I/O power supply of the CPU to be connected.
2
TVDD
Output
X3.3V
(N.C.)
Input
Yes
TVDD signal is not used in FP-40.
X3.3V is a FP-40 unique signal and can be used as 3.3V
power supply function.
Please note that this signal should not be used if X5V(Pin
20) is used as the power supply.
When not used, leave as NC.
3
TRST/
N.C.(Cortex-M)
-
TRST
Input
-
TRST is not used with Cortex-M core CPUs. Leave as NC.
For CPUs other than Cortex-M, please refer to the
datasheet.
4
GND
-
GND
-
-
5
TDI
Input
TDI
Input
-
6
GND
-
GND
-
-
7
TMS
Input
TMS
Input
-
8
GND
-
GND
-
-
9
TCK
Input
TCK
Input
-
10
GND
-
GND
-
-
11
N.C.
-
N.C.
-
-
12
GND
-
GND
-
-
13
TDO
Output
TDO
Output
-
14
GND
-
GND
-
-
15 SRSTn
Input
SRSTn
Input
-
Connect the reset signal to the connected CPU with a
wired OR circuit or an OR circuit. The SRSTn signal is an
open collector output.
16
GND -
EX33_BSY
(N.C.)
Input
Yes
EX33_BSY is an FP-40 original signal and outputs the
operation status from FP-40.
When not used, leave as NC.
17
N.C.
-
N.C.
-
-
18
GND -
EX33_OK
(N.C.)
Input
Yes
EX33_OK is an FP-40 original signal and outputs the
operation status from FP-40.
When not used, leave as NC.
19
N.C. -
EX33_START
n
(N.C.)
Output
Yes
EX33_STARTn is an FP-40 original signal and can be
used as a write start request signal to FP-40.
When not used, leave as NC.
20
GND -
X5V
(N.C.)
Input
Yes
X5V is FP-40's unique signal and can be used as 5V
power supply function.
Cannot be used with 2-pin 3.3V power supply. If not used,
leave as NC.
Do not use as a power supply function when connected to
GND.
*1: Input/output is based on the target system.