DS72030W200FPV Renesas Electronics America, DS72030W200FPV Datasheet - Page 1427

• Manufacturer Part Number: DS72030W200FPV
• Description: MPU, 32BIT, SH7203, ROMLESS, 240QFP
• Manufacturer: Renesas Electronics America
• Series: SH7200r

Specifications of DS72030W200FPV

• Core Size: 32bit
• Program Memory Size: 32KB
• Cpu Speed: 200MHz
• Digital Ic Case Style: QFP
• No. Of Pins: 240
• Supply Voltage Range: 1.1V To 1.3V
• Operating Temperature Range: -20°C To +85°C
• Svhc: No SVHC
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

27.2
27.2.1
When the same page of the on-chip high-speed RAM is accessed from different buses
simultaneously, a conflict on the page occurs. Although each access is completed correctly, this
kind of conflict degrades the memory access speed. Therefore, it is advisable to provide software
measures to prevent such conflicts as far as possible. For example, no conflict will arise if
different pages are accessed by each bus.
27.2.2
Before disabling memory operation or write access to the on-chip high-speed RAM through the
RAME or RAMWE bit, be sure to read from any address and then write to the same address in
each page; otherwise, the last written data in each page may not be actually written to the RAM.
// For page 0
// For page 1
// For page 2
// For page 3
Usage Notes
Page Conflict
RAME and RAMWE Bits
MOV.L
MOV.L
MOV.L
MOV.L
MOV.L
MOV.L
MOV.L
MOV.L
MOV.L
MOV.L
MOV.L
MOV.L
#H'FFF80000,R0
@R0,R1
R1,@R0
#H'FFF84000,R0
@R0,R1
R1,@R0
#H'FFF88000,R0
@R0,R1
R1,@R0
#H'FFF8C000,R0
@R0,R1
R1,@R0
Figure 27.1 Examples of Read/Write
Rev. 3.00 Sep. 28, 2009 Page 1395 of 1650
Section 27 On-Chip RAM
REJ09B0313-0300