Talaria TWO
TM
Evaluation & Development Kit
Version 2.0
13
©InnoPhase, Inc. 2021
7
Functional Description
Following are the functional modes that can be achieved in the INP301x board:
1.
Stand-alone mode (host-less)
2.
Shield mode (hosted)
More details about each mode are available in subsequent sections. Switching between the modes is
handled by DPDT switch U3 for power, and multi-port SPDT switch U1 for the GPIOs.
7.1
Stand-alone mode
The stand-alone mode is intended for following use cases:
1.
Host-less application development on INP101x modules
2.
Programing access to INP101x modules
In stand-alone mode, the U3 switch is pushed towards pin 3, which disconnects power and IO
from shield headers and connects them to FTDI. The FTDI port layout is shown in Table 2.
FTDI Bus
Interface to Talaria TWO
TM
A
JTAG
B
RESET
C
UART
D
CONSOLE (UART)
Table 2: FTDI Layout
The A & B bus of FTDI device supports MPSEE protocol, hence JTAG is assigned to A-bus. The
BDBUS7 is connected EN_CHIP of the INP101x module. The C & D bus of FTDI device used as
UARTs, with C-bus connected to peripheral UART of INP101x module and D-bus connected is
CONSOLE port (GPIO17) of INP101x module.
The JTAG on A-bus is used for debugging applications on the INP101x module. The UART on C-bus
is used for programming the INP101x module. The CONSOLE port is a unidirectional UART from
INP101x module that operates at high baud rate of 2457600, used for debug prints.