R8A77850AADBGV Renesas Electronics America, R8A77850AADBGV Datasheet - Page 572
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
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
R8A77850AADBGV
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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12. DDR2-SDRAM Interface (DBSC2)
Figure 12.17 shows an example of performing auto-refresh after read access of bank A, the page
for which had been closed. After issuing an ACT command and READ command for bank A and
performing data reading, a PALL command must be used to close all banks in order to perform
auto-refresh. In order to issue the PALL command, the tRAS time constraint must be satisfied, and
issuing of the PALL command is delayed until this time. Then, when issuing the REF command,
both of time constraints tRP and tRC must be satisfied simultaneously. When these constraints are
both satisfied, the REF command is issued and auto-refresh is performed.
Rev.1.00 Jan. 10, 2008 Page 540 of 1658
REJ09B0261-0100
Example of CL = 3
MCK0,
MCK1
MCKE
MCS
MRAS
MCAS
MWE
MA[14:11]
MA[9:0]
MA[10]
MBA[2:0]
MDQS[3:0]
MDM[3:0]
MDQ[31:0]
SDRAM
command
bank A
ACT
Valid
Valid
Valid
Invalid
Invalid
Invalid
High level
READ
bank A
Valid
Valid
Valid
Invalid
Figure 12.17 tRC
tRAS
= 9 cycles
tRC
= 12 cycles
Invalid
Invalid
Read data
Invalid
Invalid
PALL
tRP
= 3 cycles
Invalid
Invalid
REF
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