R8A77850ANBGV Renesas Electronics America, R8A77850ANBGV Datasheet - Page 177

• Manufacturer Part Number: R8A77850ANBGV
• Description: IC SUPERH MPU ROMLESS 436-BGA
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7780r

Specifications of R8A77850ANBGV

• Core Processor: SH-4A
• Core Size: 32-Bit
• Speed: 600MHz
• Connectivity: Audio Codec, MMC, Serial Sound, SCI, SIO, SPI, SSI
• Peripherals: DMA, POR, WDT
• Number Of I /o: 108
• Program Memory Type: ROMless
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 1 V ~ 1.2 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 436-BGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

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.
In the following descriptions, the address space in virtual memory in this LSI is referred to as
virtual address space, and the address space in physical memory as physical address space.
Process 1
Physical
Memory
(0)
Process 1
Process 2
Process 3
Process 1
Figure 7.1 Role of MMU
Physical
Memory
Physical
Memory
(1)
(3)
Process 1
Process 1
Process 2
Process 3
Rev.1.00 Jan. 10, 2008 Page 145 of 1658
7. Memory Management Unit (MMU)
Virtual
Memory
Virtual
Memory
MMU
MMU
REJ09B0261-0100
Physical
Memory
Physical
Memory
(2)
(4)