HD6417706 RENESAS [Renesas Technology Corp], HD6417706 Datasheet - Page 150

• Manufacturer Part Number: HD6417706
• Description: Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

Table 5.5
Table 5.6
5.3
5.3.1
If the cache is enabled, whenever instructions or data in memory are accessed the cache will be
searched to see if the desired instruction or data is in the cache. Figure 5.2 illustrates the method
by which the cache is searched. The cache is a physical cache and holds physical addresses in its
address section.
Entries are selected using bits 11 to 4 of the address (virtual) of the access to memory and the
address tag of that entry is read. In parallel to reading of the address tag, the virtual address is
translated to a physical address in the MMU. The physical address after translation and the
physical address read from the address section 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.
Rev. 4.00, 03/04, page 104 of 660
LRU (5 to 0)
000000, 000001, 000011, 001011, 100000, 100001, 101001, 101011
000100, 000110, 000111, 001111, 010100, 010110, 011110, 011111
110000, 110100, 111000, 111001, 111011, 111100, 111110, 111111
LRU (5 to 0)
000000, 000001, 000011, 000100, 000110, 000111, 001011, 001111,
010100, 010110, 011110, 011111
100000, 100001, 101001, 101011, 110000, 110100, 111000, 111001,
111011, 111100, 111110, 111111
Operation
Searching the Cache
LRU and Way Replacement (when W3LOCK=1)
LRU and Way Replacement (when W2LOCK=1 and W3LOCK=1)
Way to be Replaced
2
1
0
Way to be Replaced
1
0