HD6417727F160CV Renesas Electronics America, HD6417727F160CV Datasheet - Page 165

• Manufacturer Part Number: HD6417727F160CV
• Description: IC SH MPU ROMLESS 240QFN
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7700r

Specifications of HD6417727F160CV

• Core Processor: SH-3 DSP
• Core Size: 32-Bit
• Speed: 160MHz
• Connectivity: FIFO, SCI, SIO, SmartCard, USB
• Peripherals: DMA, LCD, POR, WDT
• Number Of I /o: 104
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.7 V ~ 2.05 V
• Data Converters: A/D 6x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 240-QFP
• 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 to 12 alone are used as the index number
2. When IX = 1, VPN bits 16 to 12 are EX-ORed with ASID bits 4 to 0 to generate the index
The method 1 is used to prevent lowered TLB efficiency that results when multiple processes run
simultaneously in the same logical address space (multiple virtual memory) and a specific entry is
selected by indexing of each process. Figures 3.6 and 3.7 show the indexing schemes.
number
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
Section 3 Memory Management Unit (MMU)
Rev.6.00 Mar. 27, 2009 Page 107 of 1036
PPN(31−10) PR(1−0) SZ C
PTEH register
31
VPN
Data array
ASID(4−0)
REJ09B0254-0600
10
0
D SH
7
ASID
0