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Section 8 X/Y Memory
Rev. 4.00 Sep. 14, 2005 Page 194 of 982
REJ09B0023-0400
8.2
X/Y Memory Access from CPU
The X/Y memory can be accessed by the CPU from spaces P0 and P2. Access from space P0 uses
the I bus, and access from space P2 use the L bus. To use the L bus, one cycle access is performed
unless page conflict occurs. Using the I bus takes more than one cycle access. Figure 8.1 shows
X/Y memory address mapping.
Reserved
Reserved
Reserved
Reserved
X memory page0 4 kbytes
X memory page1 4 kbytes
Y memory page0 4 kbytes
Y memorypage1 4 kbytes
Area1, 64 Mbytes
X/Y Memory Spece
Address A[28:0]
Address A[28:0]
I/O space
16 Mbytes
Reserved
U memory
Reserved
H'04000000
H'05000000
H'0501FFFF
H'055F0000
H'0560FFFF
H'05610000
H'07FFFFFF
H'05000000
H'05007000
H'05008000
H'05009000
H'0500FFFF
H'05010000
H'05017000
H'05018000
H'05019000
H'0501FFFF
Figure 8
.
1 X/Y Memory Address Mapping
8.3
X/Y Memory Access from DSP
The X/Y memory can be accessed by the DSP from spaces P0 and P2. Methods for accessing
differ according to instructions. Accesses via the X bus/Y bus are always 16-bit, while accesses
via the L bus are either 16-bit or 32-bit. To use the L bus, one cycle access is performed unless
page conflict occurs. Using the I bus takes more than one cycle access.
With X data transfer instructions and Y data transfer instructions, the X/Y memory is accessed via
the X bus or Y bus. These accesses are always 16-bit. In the case of a single data transfer
instruction, the X/Y memory is accessed via the L bus. In this case the access is either 16-bit
or 32-bit.
Accesses via the X bus and Y bus can be specified simultaneously.
Summary of Contents for HD6417641
Page 2: ...Rev 4 00 Sep 14 2005 Page ii of l...
Page 7: ...Rev 4 00 Sep 14 2005 Page vii of l...
Page 11: ...Rev 4 00 Sep 14 2005 Page xi of l USB Universal serial bus WDT Watch dog timer...
Page 12: ...Rev 4 00 Sep 14 2005 Page xii of l...
Page 28: ...Rev 4 00 Sep 14 2005 Page xxviii of l...
Page 204: ...Section 4 Clock Pulse Generator CPG Rev 4 00 Sep 14 2005 Page 154 of 982 REJ09B0023 0400...
Page 212: ...Section 5 Watchdog Timer WDT Rev 4 00 Sep 14 2005 Page 162 of 982 REJ09B0023 0400...
Page 228: ...Section 6 Power Down Modes Rev 4 00 Sep 14 2005 Page 178 of 982 REJ09B0023 0400...
Page 246: ...Section 8 X Y Memory Rev 4 00 Sep 14 2005 Page 196 of 982 REJ09B0023 0400...
Page 318: ...Section 11 User Break Controller UBC Rev 4 00 Sep 14 2005 Page 268 of 982 REJ09B0023 0400...
Page 454: ...Section 12 Bus State Controller BSC Rev 4 00 Sep 14 2005 Page 404 of 982 REJ09B0023 0400...
Page 504: ...Section 14 U Memory Rev 4 00 Sep 14 2005 Page 454 of 982 REJ09B0023 0400...
Page 566: ...Section 17 Compare Match Timer CMT Rev 4 00 Sep 14 2005 Page 516 of 982 REJ09B0023 0400...
Page 868: ...Section 21 A D Converter Rev 4 00 Sep 14 2005 Page 818 of 982 REJ09B0023 0400...
Page 914: ...Section 23 I O Ports Rev 4 00 Sep 14 2005 Page 864 of 982 REJ09B0023 0400...
Page 956: ...Section 24 List of Registers Rev 4 00 Sep 14 2005 Page 906 of 982 REJ09B0023 0400...
Page 1016: ...Section 25 Electrical Characteristics Rev 4 00 Sep 14 2005 Page 966 of 982 REJ09B0023 0400...
Page 1024: ...Appendix Rev 4 00 Sep 14 2005 Page 974 of 982 REJ09B0023 0400...
Page 1032: ...Rev 4 00 Sep 14 2005 Page 982 of 982 REJ09B0023 0400 X X Y data addressing 52 X Y memory 193...
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