D6417729RHF200BV Renesas Electronics America, D6417729RHF200BV Datasheet - Page 149

• Manufacturer Part Number: D6417729RHF200BV
• Description: IC SUPER H MPU ROMLESS 208QFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7700r

Specifications of D6417729RHF200BV

• Core Processor: SH-3 DSP
• Core Size: 32-Bit
• Speed: 200MHz
• Connectivity: EBI/EMI, FIFO, IrDA, SCI, SmartCard
• Peripherals: DMA, POR, WDT
• Number Of I /o: 96
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.85 V ~ 2.15 V
• Data Converters: A/D 8x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 208-QFP Exposed Pad, 208-eQFP, 208-HQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Program Memory Size: -

3.3.2
The TLB uses a 4-way set associative scheme, so entries must be selected by index. VPN bits 16
to 12 and ASID bits 4 to 0 in PTEH are used as the index number. The index number can be
generated in two different ways depending on the setting of the IX bit in MMUCR.
1. When IX = 0, VPN bits 16–12 alone are used as the index number
2. When IX = 1, VPN bits 16–12 are EX-ORed with ASID bits 4–0 to generate the index number
The second method is used to prevent lowered TLB efficiency that results when multiple
processes run simultaneously in the same virtual address space (multiple virtual memory) and a
specific entry is selected by generating an index number for each process. Figures 3.6 and 3.7
show the indexing schemes.
31
0
Virtual address
31
TLB Indexing
VPN(31−17)
Index
VPN(11−10)
17
Address array
16
Figure 3.6 TLB Indexing (IX = 1)
12
11
ASID(7−0)
0
Exclusive-OR
V
Ways 0 to 3
PPN(31−10) PR(1−0) SZ C
PTEH register
31
VPN
Rev. 5.0, 09/03, page 101 of 806
Data array
ASID(4−0)
10
0
D SH
7
ASID
0