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參數(shù)資料
| 型號(hào)： | IDT79RV4700-150MS |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 64-BIT, 150 MHz, RISC PROCESSOR, PQFP208 |
| 封裝： | MQUAD-208 |
| 文件頁數(shù)： | 20/25頁 |
| 文件大?。?/td> | 437K |
| 代理商： | IDT79RV4700-150MS |
IDT79R4700/RV4700
COMMERCIAL TEMPERATURE RANGE
4
The R4700 maintains fully precise floating-point excep-
tions while allowing both overlapped and pipelined opera-
tions. Precise exceptions are extremely important in
mission-critical environments and highly desirable for
debugging in any environment.
The floating-point unit operation’s set includes floating-
point add, subtract, multiply, divide, square root, conversion
between fixed-point and floating-point format, conversion
among floating-point formats and floating-point compare.
These operations comply with the IEEE Standard 754.
Table 2 lists the latencies of some of the floating-point
instructions in internal processor cycles. Note that multi-
plies are pipelined so that a new multiply can be initiated
every four pipeline cycles
Floating-Point General Register File
The floating-point register file is made up of thirty-two
64-bit registers. With the LDC1 and SDC1 instructions the
floating-point unit can take advantage of the 64-bit wide
data cache and issue a co-processor load or store double-
word instruction in every cycle.
The floating-point control register space contains two
registers: one for determining configuration and revision
information for the coprocessor and one for control and
status information. These are primarily involved with
diagnostic software, exception handling, state saving and
restoring, and control of rounding modes.
Operation
Single
Precision
Double
Precision
ADD
4
SUB
4
MUL
4
5
DIV
32
61
SQRT
31
60
CMP
3
FIX
4
FLOAT
6
ABS
1
MOV
1
NEG
1
LWC1, LDC1
2
SWC1, SDC1
1
Table 2. Floating-Point Cycles
0
47
TLB
(entries protected
from TLBWR)
EntryHi
10*
EntryLo0
2*
EntryLo1
3*
PageMask
5*
Wired
6*
Random
1*
Index
0*
Status
12*
Cause
13*
EPC
14*
ErrorEPC
30*
Count
9*
Compare
11*
Context
4*
XContext
20*
PRId
15*
Config
16*
TagHi
29*
TagLo
28*
ECC
26*
CacheErr
27*
BadVAddr
8*
LLAddr
17*
* Register number
Figure 3. The R4700 CPO Registers
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