NB2DSK01 - User Board Headers
The NB2DSK01 includes two JTAG extender headersfor connection of user boards, such as third party development boards or production prototype boards. These 10-pin headers – designated HDR1 and HDR2 – facilitate the inclusion of user boards into the Hard and Soft JTAGchains, for design download and debugging from within the Altium Designer software.
Figure 1. User Board headers.
The presence of a user board is determined by the signal level on pin 10 of a header. If this is Low the NanoTalk Controller will route both the Hard and Soft JTAG chains via the header.
If the user board does not support the Soft JTAG chain then connect pin 5 (TDI_SOFT) to pin 6 (TDO_SOFT). If this is not done, the Soft JTAG chain will effectively be broken at the header and no soft devices (processors, virtual instruments) will be 'seen' by the system. Alternatively, either header can be excluded from the Soft JTAG chain directly from the firmware-driven GUI on the TFT LCD panel. For more information, see TFT LCD Panel - Bypassing JTAG Devices.
If a user board contains a physical device that is not supported by the system, the device will appear in the Hard Devices chain of the Devices view (View » Devices Views) as a Generic JTAG Device.
Figure 2. Generic JTAG
device detected in the Hard
Devices chain.
For more information on getting the system to drive the Hard JTAG chain containing such a device, see Generic JTAG Device Support.
Location on Board
The two headers, labeled 'User Board A' (HDR1) and 'User Board B' (HDR2) respectively, are located on the solder side of the board, to the left of the SD card reader.
Schematic Reference
The User Board JTAG circuitry can be found on the following sheets of the motherboard schematics:
- Sheet 26 (
JTAG_ALTIUM_AUTO.SchDoc, entitled Auto-Detect JTAG Circuit)
- Sheet 27 (
CON_USERJTAG_10WBOXHDRRAM.SchDoc, entitled User-Board JTAG Header).