Figure 3-5. Data Path For Writes To The Falcon Internal Csrs - Motorola MVME2600 Series Reference Manual

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. 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 must have a size of 1 or 4 bytes and they must be
aligned. Some Tester registers are limited to 4-byte only accesses. Figures
3-6, 3-7, 3-8, and 3-9 show the memory map for the different kinds of
access.
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