HD6417708RF100A Renesas Electronics America, HD6417708RF100A Datasheet - Page 83

• Manufacturer Part Number: HD6417708RF100A
• Description: IC SUPERH MPU ROMLESS 144LQFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7700r

Specifications of HD6417708RF100A

• Core Processor: SH-2
• Core Size: 32-Bit
• Speed: 100MHz
• Connectivity: EBI/EMI, SCI, SmartCard
• Peripherals: POR, WDT
• Number Of I /o: 8
• Program Memory Type: ROMless
• Voltage - Supply (vcc/vdd): 3.15 V ~ 3.6 V
• Oscillator Type: External
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 144-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Ram Size: -
• Program Memory Size: -
• Data Converters: -

3.3.3
The results of address comparison determine whether a specific virtual page number is registered
in the TLB. The virtual page number of the virtual address that accesses external memory is
compared to the virtual page number of the indexed TLB entry. The ASID within the PTEH is
compared to the ASID of the indexed TLB entry. All four ways are searched simultaneously. If the
compared values match, and the indexed TLB entry is valid (V bit = 1), the hit is registered.
It is necessary to have the software ensure that TLB hits do not occur simultaneously in more than
one way, as hardware operation is not guaranteed if this happens. For example, if there are two
identical TLB entries with the same VPN and a setting is made such that a TLB hit is made only
by a process with ASID = H'FF when one is in the shared state (SH = 1) and the other in the non-
shared state (SH = 0), then if the ASID in PHE is set to H'FF, there is a possibility of simultaneous
TLB hits in both these ways. It is therefore necessary to ensure that this kind of setting is not made
by the software.
The object compared varies depending on the page management information (SZ, SH) in the TLB
entry. It also varies depending on whether the system supports multiple virtual memory or single
virtual memory.
The page size information determines whether VPN (11–10) is compared. VPN (11–10) is
compared for 1-kbyte pages (SZ = 0) but not for 4-kbyte pages (SZ = 1).
31
0
Virtual address
31
VPN(31–17)
TLB Address Comparison
Index
VPN(11–10)
17
Address array
16
Figure 3.7 TLB Indexing (IX = 0)
12
11
ASID(7–0)
0
V
Way 0–3
PPN(31–10) PR(1–0) SZ C
Data array
D SH
63