C167CS datasheet(225/517 Pages) INFINEON

225 / 517 page

C167CS

Derivatives

The External Bus Interface

User’s Manual

9-37

V2.0, 2000-07

9.8

The XBUS Interface

The C167CS provides an on-chip interface (the XBUS interface), via which integrated

customer/application specific peripherals can be connected to the standard controller

core. The XBUS is an internal representation of the external bus interface, i.e. it is

operated in the same way.

For each peripheral on the XBUS (X-Peripheral) there is a separate address window

controlled by a register pair XBCONx/XADRSx (similar to registers BUSCONx and

ADDRSELx). As an interface to a peripheral in many cases is represented by just a few

registers, the XADRSx registers partly select smaller address windows than the

standard ADDRSEL registers. As the XBCONx/XADRSx register pairs control integrated

peripherals rather than externally connected ones, they are fixed by mask programming

rather than being user programmable.

X-Peripheral accesses provide the same choices as external accesses, so these

peripherals may be bytewide or wordwide. Because the on-chip connection can be

realized very efficient and for performance reasons X-Peripherals are only implemented

with a separate address bus, i.e. in demultiplexed bus mode. Interrupt nodes are

provided for X-Peripherals to be integrated.

Note: If you plan to develop a peripheral of your own to be integrated into a C167CS

device to create a customer specific version, please ask for the specification of the

XBUS interface and for further support.

C167CS Datasheet(PDF) 225 Page - Infineon Technologies AG