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VersaKit-30xx
2.8
Onboard FM24C64 I2C FRAM, FM25CL64 SPI FRAM and FM31256 MCU Companion
A 5V, 64Kb I²C FRAM device (FM24CL64) is included with the development board at position U8. The SCL and SDA
lines of FM24C64 are connected to the H12 2x1 header footprint.
The development board also features a FM31256 Processor Companion including FRAM at position U8, featuring 256Kb
of FRAM memory, a real-time clock (RTC), a watchdog timer, an event counter and power fail monitoring circuitry. A 32
kHz crystal required for driving the FM31256's RTC is also included on the PCB.
Two 2KΩ pull-up resistors (R15 and R16) are connected between the 3.3V supply and the SDA and SCL lines,
respectively. Two header footprints are provided for accessing the FM3164 I/Os. The FM3164's I²C communications
interface is connected to H12.
Finally, an FM25CL64, a 3V 64Kb SPI FRAM, is also installed on the development board at position U5. The device
communication interface I/Os are accessible through the H7 header footprint.
3 Overview of the VJTAG-USB interface
The VJTAG-USB board is a USB-based JTAG interface for in-circuit programming and debugging of Ramtron's
VRS51L3074 and other JTAG-based microcontrollers. The VJTAG-USB connects directly to the VersaKit-30xx devboard
and can be used on any prototype/production board featuring a Ramtron JTAG based MCU. The following figure depicts
the VJTAG-USB interface and its principal features.
Figure 11: VJTAG-USB Interface
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www.ramtron.com
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