C167CS datasheet(48/517 Pages) INFINEON

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C167CS

Derivatives

Memory Organization

User’s Manual

3-11

V2.0, 2000-07

3.4

External Memory Space

The C167CS is capable of using an address space of up to 16 MByte. Only parts of this

address space are occupied by internal memory areas. All addresses which are not used

for on-chip memory (ROM/Flash/OTP or RAM) or for registers may reference external

memory locations. This external memory is accessed via the C167CS’s external bus

interface.

Four memory bank sizes are supported:

• Non-segmented mode: 64 KByte

with A15 … A0 on PORT0 or PORT1

• 2-bit segmented mode: 256 KByte with A17 … A16 on Port 4

and A15 … A0 on PORT0 or PORT1

• 4-bit segmented mode: 1 MByte

with A19 … A16 on Port 4

and A15 … A0 on PORT0 or PORT1

• 8-bit segmented mode: 16 MByte with A22 … 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 C167CS 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 selected during reset by pin EA and PORT0 pins. For

further details about the external bus configuration and control please refer to Chapter 9.

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 in segment 0 can be accessed independent

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

The external memory is not provided for single bit storage and therefore it is not

bitaddressable.

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