HD6417706F133 Renesas Electronics America, HD6417706F133 Datasheet - Page 113

• Manufacturer Part Number: HD6417706F133
• Description: IC SUPERH MPU ROMLESS 176LQFP
• Manufacturer: Renesas Electronics America
• Series: SuperH® SH7700r

Specifications of HD6417706F133

• Core Processor: SH-3
• Core Size: 32-Bit
• Speed: 133MHz
• Connectivity: EBI/EMI, FIFO, SCI, SmartCard
• Peripherals: DMA, POR, WDT
• Number Of I /o: 103
• Program Memory Type: ROMless
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.75 V ~ 2.05 V
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 75°C
• Package / Case: 176-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Data Converters: -

Section 3 Memory Management Unit (MMU)
Virtual address
31
17
16
12
11
0
Index
Ways 0 to 3
0
VPN(31–17)
VPN(11, 10)
ASID(7–0)
V
PPN(31–10) PR(1, 0) SZ C
D SH
31
Address array
Data array
Figure 3.6 TLB Indexing (IX = 0)
3.3.3
TLB Address Comparison
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 software ensure that TLB hits do not occur simultaneously in more than one
way, as hardware operation is not guaranteed if this occurs. 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 PTEH 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
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).
The sharing information (SH) determines whether the PTEH.ASID and the ASID in the TLB entry
are compared. ASIDs are compared when there is no sharing between processes (SH
0) but not
when there is sharing (SH
1).
Rev. 5.00 May 29, 2006 page 63 of 698
REJ09B0146-0500