HD6417706F133 Renesas Electronics America, HD6417706F133 Datasheet - Page 102
HD6417706F133
Manufacturer Part Number
HD6417706F133
Description
IC SUPERH MPU ROMLESS 176LQFP
Manufacturer
Renesas Electronics America
Series
SuperH® SH7700r
Datasheet
1.HD6417706F133V.pdf
(751 pages)
Specifications of HD6417706F133
Core Processor
SH-3
Core Size
32-Bit
Speed
133MHz
Connectivity
EBI/EMI, FIFO, SCI, SmartCard
Peripherals
DMA, POR, WDT
Number Of I /o
103
Program Memory Type
ROMless
Ram Size
16K x 8
Voltage - Supply (vcc/vdd)
1.75 V ~ 2.05 V
Oscillator Type
Internal
Operating Temperature
-20°C ~ 75°C
Package / Case
176-LQFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Program Memory Size
-
Data Converters
-
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Section 3 Memory Management Unit (MMU)
Although the functions of the MMU could also be implemented by software alone, the need for
translation to be performed by software each time a process accesses physical memory would
result in poor efficiency. For this reason, a buffer for address translation (translation look-aside
buffer: TLB) is provided in hardware to hold frequently used address translation information. The
TLB can be described as a cache for storing address translation information. Unlike cache
memory, however, if address translation fails, that is, if an exception is generated, switching of
address translation information is normally performed by software. This makes it possible for
memory management to be performed flexibly by software.
The MMU has two methods of mapping from virtual memory to physical memory: a paging
method using fixed-length address translation, and a segment method using variable-length
address translation. With the paging method, the unit of translation is a fixed-size address space
(usually of 1 to 64 kbytes) called a page.
In the following text, this LSI's address space in virtual memory is referred to as virtual address
space, and address space in physical memory as physical memory space.
Rev. 5.00 May 29, 2006 page 52 of 698
REJ09B0146-0500
Process 1
Physical
memory
Process 1
Process 1
Process 2
Process 3
Figure 3.1 MMU Functions
Physical
memory
Physical
memory
(3)
(1)
Process 1
Process 1
Process 2
Process 3
Virtual
memory
Virtual
memory
MMU
MMU
Physical
memory
Physical
memory
(4)
(2)
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