HD6417751RF240V Renesas Electronics America, HD6417751RF240V Datasheet - Page 479

• Manufacturer Part Number: HD6417751RF240V
• Description: MPU 1.5/3.3V 0K PB-FREE 256-QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7750r

Specifications of HD6417751RF240V

• Core Processor: SH-4
• Core Size: 32-Bit
• Speed: 240MHz
• Connectivity: EBI/EMI, FIFO, SCI, SmartCard
• Peripherals: DMA, POR, WDT
• Number Of I /o: 39
• Program Memory Type: ROMless
• Ram Size: 48K x 8
• Voltage - Supply (vcc/vdd): 1.4 V ~ 1.6 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 256-QFP Exposed Pad, 256-eQFP, 256-HQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

Bits 15 to 13—Write Precharge Delay (TRWL2–TRWL0): These bits set the synchronous
DRAM write precharge delay time. In auto-precharge mode, they specify the time until the next
bank active command is issued after a write cycle. After a write cycle, the next active command is
not issued for a period set by TPC[2:0] and TRWL[2:0] bits*. In RAS down mode, they specify
the time until the next precharge command is issued. After a write cycle, the next precharge
command is not issued for a period of TRWL. This setting is valid only when synchronous DRAM
interface is set.
Note: * For setting values and the period during which no command is issued, see 23.3.3, Bus
Bit 15: TRWL2
0
1
Note:
*
Timing.
Inhibited in RAS down mode
Bit 14: TRWL1
0
1
0
1
0
1
0
1
0
1
0
1
Bit 13: TRWL0
Rev.4.00 Oct. 10, 2008 Page 379 of 1122
Write Precharge ACT Delay Time
1 (Initial value)
2
3*
4*
5*
Reserved (Setting prohibited)
Reserved (Setting prohibited)
Reserved (Setting prohibited)
13. Bus State Controller (BSC)
REJ09B0370-0400