R8A77850ANBGV Renesas Electronics America, R8A77850ANBGV Datasheet - Page 528

• 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)
Rev.1.00 Jan. 10, 2008 Page 496 of 1658
REJ09B0261-0100
Bit
20 to 16 TRC4 to
15 to 12 ⎯
Bit Name
TRC0
Initial
Value
0 0100
All 0
R/W
R/W
R
Description
tRC (ACT-ACT/REF period) Setting Bits
These bits set the constraint for the minimum time from
ACT command to ACT command (in the same bank)/
REF command. These bits should be set according to
the SDRAM specifications. The number of cycles is the
number of DDR clock cycles.
00000: Setting prohibit (If specified, correct operation
00011: Setting prohibit (If specified, correct operation
00100: 5 cycles
00101: 6 cycles
10010: 19 cycles
10011: Setting prohibit (If specified, correct operation
11111: 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.
:
:
:
cannot be guaranteed.)
cannot be guaranteed.)
cannot be guaranteed.)
cannot be guaranteed.)