HD6417705F133BV Renesas Electronics America, HD6417705F133BV Datasheet - Page 149

• Manufacturer Part Number: HD6417705F133BV
• Description: MPU 3V 0K PB-FREE 208 FP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7700r

Specifications of HD6417705F133BV

• Core Processor: SH-3
• Core Size: 32-Bit
• Speed: 133MHz
• Connectivity: EBI/EMI, FIFO, IrDA, SCI, USB
• Peripherals: DMA, POR, PWM, WDT
• Number Of I /o: 105
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.4 V ~ 1.6 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 208-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

4.3
4.3.1
If the cache is enabled (the CE bit in CCR1 = 1), whenever instructions or data in spaces P0, P1,
P3, and U0 are accessed the cache will be searched to see if the desired instruction or data is in the
cache. Figure 4.2 illustrates the method by which the cache is searched. The cache is a physical
cache and holds physical addresses in its address section. The following will be described for the
32-kbyte mode as an example.
Entries are selected using bits 12 to 4 of the address (virtual) of the access to memory and the tag
address of that entry is read. The virtual address (bits 31 to 10) of the access to memory and the
physical address (tag address) read from the address array are compared. The address comparison
uses all four ways. When the comparison shows a match and the selected entry is valid (V = 1), a
cache hit occurs. When the comparison does not show a match or the selected entry is not valid (V
= 0), a cache miss occurs. Figure 4.2 shows a hit on way 1.
31
Operation
Searching the Cache
Virtual address
CMP0: Comparison circuit 0
CMP1: Comparison circuit 1
CMP2: Comparison circuit 2
CMP3: Comparison circuit 3
Physical address
MMU
Entry selection
13 12
511
CMP0 CMP1 CMP2 CMP3
0
1
V U Tag address
Hit signal 1
Figure 4.2 Cache Search Scheme
4 3 2 1 0
Ways 0 to 3
Longword (LW) selection
LW0
LW1
Rev. 2.00, 09/03, page 101 of 690
LW2
Ways 0 to 3
LW3