Users Manual TOPAS900 Flash V2.1
| MEMORY MAP |
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| Boot Memory : internal ROM |
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|
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| /EA = H |
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| /BOOT = H |
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000000H |
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| 000000H |
Internal I/O |
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|
|
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0000A0H | (160 bytes) |
| 0000A0H |
Internal RAM |
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|
|
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| (8K bytes) |
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0020A0H |
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| 0020A0H |
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external memory
external memory
MEMORY MAP
Boot Memory : external ROM
/EA = L /BOOT = H
Internal I/O (160 bytes)
Internal RAM (8K bytes)
external memory
ROMSTART*
External Flash Memory (512 K bytes)
ext. | external memory |
ROM |
|
RAMSTART*
FC0000H
FFFF00H
FFFFFFH
External RAM (128 K bytes)
Internal Flash ROM (256K bytes)
Vector table (256 bytes)
RAMSTART*
F80000H
int.
ROM FFFF00H
FFFFFFH
External RAM (128 K bytes)
External Flash Memory (512 K bytes)
Vector table (256 bytes)
ext.
ROM
*ROMSTART is programmed by CS2 registers
*RAMSTART is programmed by CS1 registers
Figure 13 : Memory Map for using external / internal Flash
For programming the external flash the /EA line has to be set High which can be derived by opening the jumper J_EA (see fig. 1 at the right top and in the schematic fig. 10 at the bottom in the middle). The map of fig. 7 is valid and the external flash can be programmed supported by the
For normal operation and debugging it is important that the system starts from external flash, i.e. the vector table and the firmware have to be located and to be started from there. Like shown in the map of fig. 8 the external flash is located from off address F80000h to FFFFFFh including the vector area.
For running in normal operation the jumper J_EA can be left open, because the /EA line is controlled by the firmware controller. If the Flash Carrier Board works
HWU Elektronik Oberhausen | Page 33 |