R8A77850ANBGV Renesas Electronics America, R8A77850ANBGV Datasheet - Page 566

• Manufacturer Part Number: R8A77850ANBGV
• Description: IC SUPERH MPU ROMLESS 436-BGA
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7780r

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: -

12. DDR2-SDRAM Interface (DBSC2)
Figure 12.12 shows waveforms during auto-refresh operation resulting from settings of the
SDRAM refresh control registers 0, 1, and 2. The DBSC2 issues a REF command automatically
after the PALL command is issued when at least one DDR2-SDRAM bank is activated before the
REF command. Consequently, there is no need to use software to manage precharging of all the
banks for the auto-refresh operation.
Rev.1.00 Jan. 10, 2008 Page 534 of 1658
REJ09B0261-0100
Figure 12.11 Waveforms for 32-Byte Writing (When the Bus Width Is Set to 32 Bits)
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
Invalid
Invalid
High level
WRITE
bank A
Valid
Valid
Valid
Invalid
Invalid
Invalid
WRITE
bank A
Valid
Valid
Valid
Write data
Invalid
Invalid
Invalid
Invalid
Invalid