R8A77850AADBGV Renesas Electronics America, R8A77850AADBGV Datasheet - Page 562
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)
12.5.7
Regarding SDRAM Access and Timing Constraints
In this section, waveforms at the various pins during basic DDR2-SDRAM access are explained
first and then the relation between DDR2-SDRAM access and the CAS latency (CL), tRAS, tRFC,
tRCD, tRP, tRRD, tWR, tRTP, tRC, READ-WRITE minimum interval, WRITE-READ minimum
interval set using the SDRAM timing registers 0 to 2 (DBTR0 to DBTR2) is explained.
(1)
Basic SDRAM Access
In this section, waveforms at the various pins during basic SDRAM access, including reading,
writing, auto-refresh, and self-refresh operations, are explained.
For the relation between writing and the ODT control signal output, refer to section 12.5.9,
Important Information Regarding ODT Control Signal Output to SDRAM.
Figure 12.8 shows waveforms for 1/2/4/8/16-byte reading when the bus width is set to 32 bits. In
this case, single-reading is performed in which the READ command is issued once. In this
example, read access processing is executed for bank A after the ACT command is issued, but
when there is a page hit, access begins with the issue of the READ command.
Rev.1.00 Jan. 10, 2008 Page 530 of 1658
REJ09B0261-0100
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