R8A77850ANBGV Renesas Electronics America, R8A77850ANBGV Datasheet - Page 435
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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11. Local Bus State Controller (LBSC)
11.5.3
SRAM interface
(1)
Basic Timing
The strobe signals for the SRAM interface in this LSI are output primarily based on the SRAM
connection. Figure 11.5 shows the basic timing of the SRAM interface. Normal access without
wait cycles is completed in two cycles. The BS signal is asserted for one or two cycles to indicate
the start of a bus cycle. The CSn signal is asserted at the rising edge of the clock in the T1 state,
and negated at the next rising edge of the clock in the T2 state. Therefore, there is no negation
period in accesses at minimum pitch.
In reading, an access size is not specified. The output of an access address on the address pins
(A25 to A0) is correct, however, since the access size is not specified, 32-bit data is always output
when a 32-bit device is in use, and 16-bit data is output when a 16-bit device is in use. During
writing, only the WE signal corresponding to the byte to be written is asserted. For details, see
section 11.5.1, Endian/Access Size and Data Alignment.
In 32-byte transfer, a total of 32 bytes are transferred continuously according to the bus width set.
The first access is performed on the data for which an access request is issued, and the remaining
accesses are performed in wraparound method according to the set bus width. The bus is not
released during this transfer.
Rev.1.00 Jan. 10, 2008 Page 403 of 1658
REJ09B0261-0100
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