1. Overview
Rev.1.00 Jan. 10, 2008 Page 3 of 1658
REJ09B0261-0100
Item Features
FPU
•
On-chip floating-point coprocessor
•
Supports single (32-bit) and double (64-bit) precisions
•
Supports IEEE754-compliant data types and exceptions
•
Two rounding modes: Round to Nearest and Round to Zero
•
Handling of denormalized numbers: Truncation to zero or interrupt-
generation for IEEE754 compliance
•
Floating-point registers: 32 bits
×
16 words
×
2 banks
(single-precision
×
16 words or double-precision
×
8 words)
×
2 banks
•
32-bit CPU-FPU floating-point communications register (FPUL)
•
Supports FMAC (multiply-and-accumulate) instruction
•
Supports FDIV (divide) and FSQRT (square root) instructions
•
Supports FLDI0/FLDI1 (load constants 0 and 1) instructions
•
Instruction-execution times
⎯
Latency (FADD/FSUB): 3 cycles (single-precision), 5 cycles (double-
precision)
⎯
Latency (FMAC/ FMUL): 5 cycles (single-precision), 7 cycles (double-
precision)
⎯
Pitch (FADD/FSUB): 1 cycle (single-precision/double-precision)
⎯
Pitch (FMAC/FMUL): 1 cycle (single-precision), 3 cycles (double-
precision)
Note:
FMAC only supports single-precision operands.
•
3-D graphics instructions (single-precision only)
⎯
4-dimensional vector-conversion and matrix operations (FTRV):
4 cycles (pitch), 8 cycles (latency)
⎯
4-dimensional vector (FIPR) inner product: 1 cycle (pitch), 5 cycles
(latency)
•
Ten-stage pipeline
Summary of Contents for SH7781
Page 4: ...Rev 1 00 Jan 10 2008 Page iv of xxx REJ09B0261 0100 ...
Page 74: ...2 Programming Model Rev 1 00 Jan 10 2008 Page 44 of 1658 REJ09B0261 0100 ...
Page 272: ...8 Caches Rev 1 00 Jan 10 2008 Page 242 of 1658 REJ09B0261 0100 ...
Page 376: ...10 Interrupt Controller INTC Rev 1 00 Jan 10 2008 Page 346 of 1658 REJ09B0261 0100 ...
Page 694: ...13 PCI Controller PCIC Rev 1 00 Jan 10 2008 Page 664 of 1658 REJ09B0261 0100 ...
Page 762: ...14 Direct Memory Access Controller DMAC Rev 1 00 Jan 10 2008 Page 732 of 1658 REJ09B0261 0100 ...
Page 788: ...15 Clock Pulse Generator CPG Rev 1 00 Jan 10 2008 Page 758 of 1658 REJ09B0261 0100 ...
Page 828: ...17 Power Down Mode Rev 1 00 Jan 10 2008 Page 798 of 1658 REJ09B0261 0100 ...
Page 846: ...18 Timer Unit TMU Rev 1 00 Jan 10 2008 Page 816 of 1658 REJ09B0261 0100 ...
Page 1292: ...24 Multimedia Card Interface MMCIF Rev 1 00 Jan 10 2008 Page 1262 of 1658 REJ09B0261 0100 ...
Page 1326: ...25 Audio Codec Interface HAC Rev 1 00 Jan 10 2008 Page 1296 of 1658 REJ09B0261 0100 ...
Page 1482: ...28 General Purpose I O Ports GPIO Rev 1 00 Jan 10 2008 Page 1452 of 1658 REJ09B0261 0100 ...
Page 1538: ...30 User Debugging Interface H UDI Rev 1 00 Jan 10 2008 Page 1508 of 1658 REJ09B0261 0100 ...
Page 1688: ...Appendix Rev 1 00 Jan 10 2008 Page 1658 of 1658 REJ09B0261 0100 ...
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Page 1692: ...SH7785 Hardware Manual ...