HD6417760BP200AD Renesas Electronics America, HD6417760BP200AD Datasheet - Page 198
HD6417760BP200AD
Manufacturer Part Number
HD6417760BP200AD
Description
IC SUPERH MPU ROMLESS 256BGA
Manufacturer
Renesas Electronics America
Series
SuperH® SH7750r
Datasheet
1.D6417760BP200ADV.pdf
(1418 pages)
Specifications of HD6417760BP200AD
Core Processor
SH-4
Core Size
32-Bit
Speed
200MHz
Connectivity
Audio Codec, CAN, EBI/EMI, FIFO, I²C, MFI, MMC, SCI, Serial Sound, SIM, SPI, USB
Peripherals
DMA, LCD, POR, WDT
Number Of I /o
69
Program Memory Type
ROMless
Ram Size
48K x 8
Voltage - Supply (vcc/vdd)
1.4 V ~ 1.6 V
Data Converters
A/D 4x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
256-BGA
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Eeprom Size
-
Program Memory Size
-
Available stocks
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Section 6 Memory Management Unit (MMU)
When address translation from virtual memory to physical memory is performed using the MMU,
it may happen that the translation information has not been recorded in the MMU, or the virtual
memory of a different process is accessed by mistake. In such cases, the MMU will generate an
exception, change the physical memory mapping, and record the new address translation
information.
Although the functions of the MMU could be implemented by software alone, having address
translation performed by software each time a process accessed physical memory would be very
inefficient. For this reason, a buffer for address translation (the translation lookaside buffer: TLB)
is provided by hardware, and frequently used address translation information is placed here. The
TLB can be described as a cache for address translation information. However, unlike a cache, if
address translation fails—that is, if an exception occurs—switching of the address translation
information is normally performed by software. Thus memory management can be performed in a
flexible manner by software.
There are two methods by which the MMU can perform mapping from virtual memory to physical
memory: the paging method, using fixed-length address translation, and the segment method,
using variable-length address translation. With the paging method, the unit of translation is a
fixed-size address space called a page (usually from 1 to 64 Kbytes in size).
In the following descriptions, the address space in virtual memory in the SH-4 is referred to as
virtual address space, and the address space in physical memory as physical address space.
Rev. 2.00 Feb. 12, 2010 Page 114 of 1330
REJ09B0554-0200
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