Section 2 Programming Model
Rev.1.00 Dec. 13, 2005 Page 45 of 1286
REJ09B0158-0100
<Big endian>
DR (2i)
FR (2i)
FR (2i+1)
8n+4
8n+7
8n
8n+3
63
0
63 32 31 0
Floating-point register
Memory area
63
0
<Little endian>
Floating-point register
Memory area
DR (2i)
FR (2i)
FR (2i+1)
4n
4m
4n+3
4m+3
63
0
63 32 31 0
DR (2i)
FR (2i+1)
FR (2i)
8n+4
8n+7
8n+3
8n
63
0
63 32 31 0
(1) SZ = 0
(2) SZ = 1, PR = 0
63
0
63
0
DR (2i)
FR (2i+1)
FR (2i)
8n
8n+3
8n+7
8n+4
63
0
63 32 31 0
(3) SZ = 1, PR = 1
63
0
*
1,
*
2
*
2
Notes: 1. In the case of SZ = 0 and PR = 0, DR register can not be used.
2. The bit-location of DR register is used for double precision format when PR = 1.
(In the case of (2), it is used when PR is changed from 0 to 1.)
Figure 2.5 Relationship between SZ bit and Endian
Table 2.2
Bit Allocation for FPU Exception Handling
Field Name
FPU
Error (E)
Invalid
Operation (V)
Division
by Zero (Z)
Overflow
(O)
Underflow
(U)
Inexact
(I)
Cause FPU
exception
cause field
Bit 17
Bit 16
Bit 15
Bit 14
Bit 13
Bit 12
Enable FPU
exception
enable field
None
Bit 11
Bit 10
Bit 9
Bit 8
Bit 7
Flag
FPU exception flag
field
None
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Floating-Point Communication Register (FPUL) (32 bits, Initial Value = Undefined):
Information is transferred between the FPU and CPU via FPUL.
Содержание SH7780 Series
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Страница 450: ...Section 11 Local Bus State Controller LBSC Rev 1 00 Dec 13 2005 Page 400 of 1286 REJ09B0158 0100 ...
Страница 492: ...Section 12 DDR SDRAM Interface DDRIF Rev 1 00 Dec 13 2005 Page 442 of 1286 REJ09B0158 0100 ...
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