Fujitsu MB91460 SERIES On Board Memory, MCU Clocks, MCU Operating Mode, FlexRay CC Clock, Can Bus

SK-91F467-FLEXRAY V1.1

Introduction

1.3.1 On Board Memory

The starter kit includes 32MBit (4MByte) SRAM memory on board. The SRAM can be used with 5V, or with 3.3V external bus supply voltage.

1.3.2 MCU Clocks

The board is supplied with a 4MHz crystal as the main oscillation clock for the MCU. Using the internal PLL of the MCU, internal clock rates up to 100MHz can be achieved. The MCU sub clock is connected to a 32.768 kHz crystal.

1.3.3 MCU Operating Mode

The operating mode of the microcontroller can be selected with the Dip-switch S5.

1.3.4 FlexRay CC Clock

The FlexRay CC clock is operated by a 10MHz crystal mounted in a socket. By removing the 10MHz crystal it is also possible to use an external clock oscillator.

1.3.5 FlexRay CC-MCU Connection

The FlexRay CC (MB88121) is connected to the MCU via external bus. It is possible to use it in 8 bit / 16 bit multiplexed, 8 bit / 16 bit non multiplexed or SPI communication-mode (dependent from revision of MB88121). With jumper or switches the user can change between the different modes.

1.3.6 External Bus interface Connectors

Via DIN 41612 VG96ABC and VG48ABC connectors (external bus interface of the MCU), it is possible to connect the FlexRay FPGA Board to the Starter Kit and use the FPGA as FlexRay communication controller. It is also possible to connect other devices e.g. user applications or Fujitsu graphic device sub boards.

1.3.7 FlexRay Physical Layer

The connection to the physical layer of the FlexRay bus with 9-pin D-Sub connectors (X2 and X6) is realized with RS485 transceiver, or it is also possible to deselect the RS485 transceiver and use pluggable physical layer driver module from TZM (FT1080) instead.

1.3.8 CAN Bus

Three high-speed CAN-transceivers (PCA82C250) are available to connect all available on- chip CAN-controllers to 9-pin D-Sub connectors (X9, X10 and X11). The transceivers provides differential transmit and receive capability between CAN-controller and CAN-bus.

1.3.9 RS-232 and LIN

RS-232 and LIN signals are shared on the 9-pin D-Sub connectors (X1, X4 and X8). It can be selected, if RS-232 or LIN will be used.

Three separate RS-232 transceivers and three separate LIN transceivers are available, to connect the on-chip USARTs to the 9-pin D-Sub connectors.

The RS-232 transceivers generate the adequate RS-232 levels for receive (RXD) and transmit (TXD) lines. The RTS signal can be shortcut to CTS using jumpers (some PC software needs this connection, when a 1:1 cable is used).

FMEMCU-UG-910017-11 - 10 - © Fujitsu Microelectronics Europe GmbH