R8A77850ANBGV Renesas Electronics America, R8A77850ANBGV Datasheet - Page 497
R8A77850ANBGV
Manufacturer Part Number
R8A77850ANBGV
Description
IC SUPERH MPU ROMLESS 436-BGA
Manufacturer
Renesas Electronics America
Series
SuperH® SH7780r
Datasheet
1.R8A77850AADBGV.pdf
(1694 pages)
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
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
R8A77850ANBGV
Manufacturer:
Renesas Electronics America
Quantity:
10 000
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- Download datasheet (9Mb)
12. DDR2-SDRAM Interface (DBSC2)
12.3
Data Alignment
The DBSC2 accesses DDR2-SDRAM with a fixed burst length of 4 (figure 12.2). As shown in
table 12.3 and table 12.4, invalid read data is discarded during reading, and data mask signals are
used to mask invalid data during writing, according to the access size. The access times in tables
12.3 and 12.4 correspond to the burst times during reading/writing shown in figure 12.2. For
example, when the external bus width is 32 bits with a little endian, the second access (falling
edge of DQS) includes valid data if a byte access of address (8n + 0, 1, 2, 3) occurs.
Tables 12.5 to 12.8 show the correspondence with data on the external data bus for each access
size. During 16-byte and 32-byte accesses, quad word (8 bytes) access is combined, and the
SDRAM command is issued the necessary number of times according to the size to access the
SDRAM as shown in figures 12.3 and 12.4. The DDR2-SDRAM specification stipulates
sequential address changes (0→1→2→3, 1→2→3→0, 2→3→0→1, 3→0→1→2), so that the
address provided as a command is different for reading and for writing. Endian switching is
performed at power-on reset by switching using external pin MODE8.
Rev.1.00 Jan. 10, 2008 Page 465 of 1658
REJ09B0261-0100
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