R8A77850AADBGV Renesas Electronics America, R8A77850AADBGV Datasheet - Page 256
R8A77850AADBGV
Manufacturer Part Number
R8A77850AADBGV
Description
IC SUPERH MCU 436-BGA
Manufacturer
Renesas Electronics America
Series
SuperH® SH7780r
Datasheet
1.R8A77850AADBGV.pdf
(1694 pages)
Specifications of R8A77850AADBGV
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
-40°C ~ 85°C
Package / Case
436-BGA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
Program Memory Size
-
Data Converters
-
Available stocks
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Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
R8A77850AADBGV
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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8. Caches
8.3.3
When the Operand Cache (OC) is enabled (OCE = 1 in CCR) and data is written to a cacheable
area, the cache operates as follows:
1. The tag, V bit, U bit, and LRU bits on each way are read from the cache line indexed by virtual
2. The tag, read from each way, is compared with bits [28:10] of the physical address resulting
3. Cache hit (copy-back)
4. Cache hit (write-through)
5. Cache miss (copy-back, no write-back)
Rev.1.00 Jan. 10, 2008 Page 224 of 1658
REJ09B0261-0100
address bits [12:5].
from virtual address translation by the MMU:
⎯ If there is a way whose tag matches and its V bit is 1, see No. 3 for copy-back and No. 4
⎯ I If there is no way whose tag matches and its V bit is 1 and the U bit of the way which is
⎯ If there is no way whose tag matches and its V bit is 1 and the U bit of the way which is
A data write in accordance with the access size is performed for the data field on the hit way
which is indexed by virtual address bits [4:0]. Then 1 is written to the U bit. The LRU bits are
updated to indicate the way is the latest one.
A data write in accordance with the access size is performed for the data field on the hit way
which is indexed by virtual address bits [4:0]. A write is also performed to external memory
corresponding to the virtual address. Then the LRU bits are updated to indicate the way is the
latest one. In this case, the U bit isn't updated.
A data write in accordance with the access size is performed for the data field on the hit way
which is indexed by virtual address bits [4:0]. Then, the data, excluding the cache-missed data
which is written already, is read into the cache line on the way which is selected to replace
from the physical address space corresponding to the virtual address.
Data reading is performed, using the wraparound method, in order from the quad-word data (8
bytes) including the cache-missed data. While the remaining data on the cache line is being
read, the CPU can execute the next processing. When reading of one line of data is completed,
the tag corresponding to the physical address is recorded in the cache, 1 is written to the V bit
and the U bit on the way. Then the LRU bit is updated to indicate the way is latest one.
for write-through.
selected to replace using the LRU bits is 0, see No. 5 for copy-back and No. 7 for write-
through.
selected to replace using the LRU bits is 1, see No. 6 for copy-back and No. 7 for write-
through.
Write Operation
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