HD64F7045F28V Renesas Electronics America, HD64F7045F28V Datasheet - Page 429

• Manufacturer Part Number: HD64F7045F28V
• Description: IC SH2 MCU FLASH 144QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7040r

Specifications of HD64F7045F28V

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 28.7MHz
• Connectivity: EBI/EMI, SCI
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 98
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 144-QFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

7.2
Contention occurs in four cases. When it occurs, the slot splits and requires at least two cycles.
1. Contention between instruction fetch (IF) and memory access (MA)
2. Contention when the previous instruction’s destination register is used
3. Multiplier access contention
4. Contention between memory stores (MA) and either DSP operations or memory loads
7.2.1
Basic Operation when IF and MA Are in Contention (Common): The IF and MA stages both
access memory, so they cannot operate simultaneously. When the IF and MA stages both try to
access memory within the same slot, the slot splits as shown in figure 7.6. When there is a WB, it
is executed immediately after the MA ends.
(WB/DSP)
Instruction 1
Instruction 2
Instruction 3
Instruction 4
Instruction 5
Instruction 1
Instruction 2
Instruction 3
Instruction 4
Instruction 5
Contention
Contention between Instruction Fetch (IF) and Memory Access (MA)
When MA and IF are in contention, the following occurs:
Figure 7.6 Operation when IF and MA Are in Contention
IF
IF
A
A
ID
ID
IF
IF
B
B
EX
EX
ID
ID
IF
IF
C
C
MA
MA
EX
ID
—
—
IF
D
D
W/D
W/D
MA
EX
EX
ID
ID
IF
IF
E
W/D
MA
EX
ID
—
—
F
E
W/D
EX
EX
Rev. 5.00 Jun 30, 2004 page 413 of 512
ID
G
IF
MA of instruction 1 and IF of
instruction 4 contend at D
MA of instruction 2 and IF of
instruction 5 contend at E
EX
ID
F
EX
Section 7 Pipeline Operation
G
REJ09B0171-0500O
: Slot
: Slot
Split at D
Split at E