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Programming Model
MPC60x Master
3
CSR
CSR
Upper FALCON
Lower FALCON
1904 9609
Figure 3-5. Data Path for Writes to the Falcon Internal CSRs
External register data that is written on the upper data bus goes through the
upper Falcon, while data that is written on the lower data bus goes through
the lower Falcon. Unlike the internal register set, there is no automatic
copying of upper data to lower data for the external register set.
CSR read accesses can have a size of 1, 2, 4, or 8 bytes with any alignment.
CSR write accesses are restricted to a size of 1 or 4 bytes and they must be
aligned. Some Tester registers are limited to 4-byte only accesses.
Figure
3-6
through
Figure 3-9
show the memory maps for the different kinds of
access.
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3-23
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