Spectrum Digital, Inc
3.2.7 J8, ARM JTAG Emulation Header
The J8 Emulation Header is located on the top side of the board and is used to provide
an interface to ARM compatible JTAG emulators. The pinout for this connector is
shown in the table below.
Table 8: J8, ARM JTAG Emulation Header
Pin #
1
3
5
7
9
11
13
15
17
19
Signal
VCC_3V3
ARM_TRSTn
ARM_TDI
ARM_TMS
ARM_TCK
ARM_TCKRET
ARM_TDO
ARM_RSTn
NC
NC
Pin #
2
4
6
8
10
12
14
16
18
20
Signal
VCC_3V3
Ground
Ground
Ground
Ground
Ground
Ground
Ground
Ground
Ground
* Note: EMU0/EMU1 switch must be set to ARM mode
3.2.8 J9, USB Capacitance Select
The J9 jumper is used to provide more capacitance when the USB connector is used in
the host mode. When the jumper is shorted the extra capacitance is provided. These
open and shorted position are shown below.
Open
J9
USB VBUS
Shorted
J9
USB VBUS
Figure 3-8, J9, USB Capacitance Select
Table 9: J9, USB Capacitance Select
3-10
Position
Open
Shorted
Function
6.9 uF Capacitance
106.8 uF Capacitance
DM355 EVM Technical Reference
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