Sundance SMT148 - Manual (Page 13)

Version 1.4 Page 13 of 35 SMT148 User Manual
32-bit microcontrollers
The FPGA on the SMT148 carrier card is connected to two 32-bit microcontrollers
(
oxuf922 ) that enable communication with some of the most widely used standards:
UART (RS485, RS232), USB, and Firewire (1394b). Data transfers and instructions
can be set between the microcontrollers and the FPGA in both directions thus
allowing the implementation of many different schemes. The flash device will hold the
FPGA and microcontroller firmware. The 48MHz clock is required for the use of the
USB. Each microcontroller will have the following interfaces. The second
microcontroller interfaces only to a USB connector, RS232 and the FPGA.
The microcontrollers are accessible through a JTAG connector (JP10). This is the
only device in this chain. The pinout is as follow:
1 3.3V
2 TRST
3 TCK
4 TMS
5 TDO
6 TDI
Table 5 : Microcontroller JTAG
Figure 6 : Microcontroller interfaces (uC1, U65)
A jumper (JP14) enables RS232 when inserted, RS485 when removed.