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3.1.3
SH7709S MMU
Virtual Address Space
(1) P0, P3, and U0 Areas
For the P0, P3, and U0 areas, access through the cache and address translation using the TLB are
possible. These areas can be mapped to any external memory area in units of 1- or 4-Kbyte pages.
When CCR.CE is 1 and the C bit for a page in the TLB is also 1, that page will be accessed
through the cache. The caching mode, copy-back or write-through, is selected by the setting of
CCR.WT.
Some of the peripheral module's control registers are allocated to area 1 of the physical address
space. To access any of these registers via the P0, P3, or U0 area, turn off the C bit in the TLB for
the corresponding page and select no caching.
(2) P1 Area
The P1 area can be accessed through the cache. The mapping of this area is fixed within the
physical address space (H'00000000 to H'1FFFFFFF). When CCR.CE is 1, this area is accessed
through the cache. The caching mode, copy-back or write-through, is selected by the setting of
CCR.CB.
(3) P2 and P4 Areas
Access to the P2 and P4 areas through the cache is not possible. The mapping of the P2 area is
fixed within the physical address space (H'00000000 to H'1FFFFFFF) and the P4 area is mapped
to the control-register space.
(4) Uxg Area
Access to the Uxy area through the cache is not possible. This area only becomes usable when
SR.DSP holds 1. For details on the Uxy area, see the description of the xg memory.
Summary of Contents for SH7709S
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