XC2000 datasheet(78/647 Pages) INFINEON

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XC2000 Derivatives

System Units (Vol. 1 of 2)

Memory Organization

Preliminary

User’s Manual

3-16

V1.0, 2007-06

MemoryX2K, V1.1

3.7

External Memory Space

The XC2000 is capable of using an address space of up to 16 Mbytes. Only parts of this

address space are occupied by internal memory areas or are reserved. A total area of

approximately 12 Mbytes references external memory locations. This external memory

is accessed via the XC2000’s external bus interface.

Selectable memory bank sizes are supported: The maximum size of a bank in the

external memory space depends on the number of activated address bits. It can vary

from 64 Kbytes (with A15 … A0 activated) to 12 Mbytes (with A23 … A0 activated). The

logical size of a memory bank and its location in the address space is defined by

programming the respective address window. It can vary from 4 Kbytes to 12 Mbytes.

•

Non-segmented mode:

– 64 Kbytes with A15 … A0 on PORT0 or PORT1.

•

1-bit segmented mode:

– 128 Kbytes with A16 on Port 4

– and A15 … A0 on PORT0 or PORT1.

•

2-bit … 7-bit segmented mode:

– with Ax … A16 on Port 4

– and A15 … A0 on PORT0 or PORT1.

•

8-bit segmented mode:

– 12 Mbytes with A23 … A16 on Port 4

– and A15 … A0 on PORT0 or PORT1.

Each bank can be directly addressed via the address bus, while the programmable chip

select signals can be used to select various memory banks.

The XC2000 also supports four different bus types:

•

Multiplexed 16-bit Bus with address and data on PORT0 (default after Reset).

•

Multiplexed 8-bit Bus with address and data on PORT0/P0L.

•

Demultiplexed 16-bit Bus with address on PORT1 and data on PORT0.

•

Demultiplexed 8-bit Bus with address on PORT1 and data on P0L.

Memory model and bus mode are preselected during reset by pin EA and PORT0 pins.

For further details about the external bus configuration and control please refer to

Chapter XX (The External Bus Controller).

External word and byte data can only be accessed via indirect or long 16-bit addressing

modes using one of the four DPP registers. There is no short addressing mode for

external operands. Any word data access is made to an even byte address.

For PEC data transfers the external memory can be accessed independent of the

contents of the DPP registers via the PEC source and destination pointers.

Note: The external memory is not bit addressable.

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