R8A77850BDBGV#RD0Z Renesas Electronics America, R8A77850BDBGV#RD0Z Datasheet - Page 525

• Manufacturer Part Number: R8A77850BDBGV#RD0Z
• Description: IC SUPERH MPU ROMLESS 436BGA
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7780r

Specifications of R8A77850BDBGV#RD0Z

• 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: -

Bit
15 to 11 ⎯
10 to 8
7 to 3
Bit Name
TRRD2 to
TRRD0
⎯
Initial
Value
All 0
000
All 0
R/W
R
R/W
R
Description
Reserved
These bits are always read as 0. The write value should
always be 0.
Operation when a value other than 0 is written is not
guaranteed.
These bits set the ACT-ACT minimum period constraint
for the different banks. These bits should be set
according to the DDR2-SDRAM specifications. The
number of cycles is the number of DDR clock cycles.
000: 1 cycle
001: 2 cycles
010: 3 cycles
011: 4 cycles
100: Setting prohibit (If specified, correct operation
111: Setting prohibit (If specified, correct operation
Reserved
These bits are always read as 0. The write value should
always be 0.
Operation when a value other than 0 is written is not
guaranteed.
tRRD (ACT(A)-ACT(B) period) Setting Bits
:
cannot be guaranteed.)
cannot be guaranteed.)
Rev.1.00 Jan. 10, 2008 Page 493 of 1658
12. DDR2-SDRAM Interface (DBSC2)
REJ09B0261-0100