Toshiba TOPAS900 Hardware Description, Programming and Debugging Board, Firmware Processor

Users Manual TOPAS900 Flash V2.1

3.Hardware Description

TOPAS900 Flash consists of two boards: Programming-and-Debugging Board and Flash Carrier Board.

3.1.Programming and Debugging Board

As the name betrays this board is for programming and debugging purposes. The firmware processor, a TMP87P808P, is listening the serial data communication between a PC and the TOPAS900 Flash board. The firmware reacts on special data sequences to switch the target processor to several modes.

The Programming and Debugging is composed of the following components (to understand the design in detail it is recommended to make a print out of the schematics shown at the end of this manual):

∙Firmware Processor

∙Power supply

∙Status LEDs

∙Control Switches (Reset and NMI)

∙Serial Communication, Connector and Line Driver

∙Connector to Flash Carrier Board

3.1.1. Firmware Processor

A Toshiba TMP87P808 8-bit microcontroller of the TLCS-870 family is used. It is driven by an 8 MHz quartz resonator.

The processor drives control lines of the target system (Flash Carrier Board with TMP95FY64). The lines are /EA, /BOOT and /RESET. With these lines the target processor can de driven into several modes that are selected by the rising edge of the RESET input. Please refer to the manual for further information on Single Boot Mode / Single Chip Mode and Multi Chip Mode. Also read the information given by the memory maps later in this manual.

To control the target system the firmware is listening to the serial communication for certain binary control sequences that are generated by the Windows-based Flash Programming Tool. If a control sequence match is detected, the firmware processor switches the target system into the required mode.

3.1.2. Power Supply

The power supply is mainly build by the net plug and a 5V voltage regulator. Because the board has no on/off switch unplug the power plug from the board when connecting or disconnecting the target or when connecting the Flash Carrier Board to another application. The input power (at the board’s power plug) can be up to 12 V DC.