參數(shù)資料
型號(hào): μPD30181
廠商: NEC Corp.
英文描述: 64-Bit RISC Microprosessor(64位RISC微處理器)
中文描述: 64位RISC Microprosessor(64位的RISC微處理器)
文件頁(yè)數(shù): 30/68頁(yè)
文件大?。?/td> 270K
代理商: ΜPD30181
30
μ
PD30700,30700L,30710
3. FPU INTERNAL ARCHITECTURE
3.1 Internal Function Block
Figure 3-1 shows the internal block of the FPU.
The FPU can execute all the floating-point instructions defined by MIPS ISA.
Figure 3-1. Internal Block of FPU
3.2 FPU Registers
(1) Floating-point general-purpose registers (FGR)
These are physical general-purpose registers that can be directly accessed. Thirty-two of these registers are
available. The bit length of each register differs depending on the content of the FR bit of the status register.
(2) Floating-point registers (FPR)
These are logical 64-bit registers that hold a floating-point value when a floating-point operation is executed.
The number of these registers varies depending on the content of the FR bit of the status register.
64
64
64
64
64
FP register file
FP queue
V
R
10000 internal bus
64
64
FP addition
FP
multiplication
FP division
+
FP square root
Data cache
Internal bus
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