HD6417618 RENESAS [Renesas Technology Corp], HD6417618 Datasheet - Page 81
HD6417618
Manufacturer Part Number
HD6417618
Description
32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7618 Series
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.HD6417618.pdf
(646 pages)
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Price
Part Number:
HD6417618RBGN100V
Manufacturer:
RENESAS/瑞萨
Quantity:
20 000
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3.1
• Capacity: 4 kbytes (SH7618), 16 kbytes (SH7618A)
• Structure: Instructions/data unified, 4-way set associative
• Line size: 16 bytes
• Number of entries: 64 entries/way (SH7618), 256 entries/way (SH7618A)
• Write method: Write-back/write-through is selectable
• Replacement method: Least-recently-used (LRU) algorithm
3.1.1
The cache holds both instructions and data and employs a 4-way set associative system. It is
composed of four ways (banks), and each of which is divided into an address section and a data
section. Each of the address and data sections is divided into 64 entries (256 entries for the
SH7618A). The data of an entry is called a line. Each line consists of 16 bytes (4 bytes × 4). The
data capacity per way is 1 kbyte (16 bytes × 64 entries) (4 kbytes (16 bytes × 256 entries) for the
SH7618A), with a total of 4 kbytes (16 kbytes for the SH7618A) in the cache (4 ways).
Figure 3.1 shows the cache structure.
CACH000C_000020030900
(Entry 255)*
Note: * For the SH7618A.
Features
Cache Structure
Entry 63
Entry 0
Entry 1
.
.
.
.
.
.
24 (1 + 1 + 22) bits
V U Tag address
Address array (ways 0 to 3)
Figure 3.1 Cache Structure
Section 3 Cache
(255)*
63
0
1
.
.
.
.
.
.
LW0
LW0 to LW3: Longword data 0 to 3
128 (32 × 4) bits
LW1
LW2
Data array (ways 0 to 3)
Rev. 6.00 Jun. 12, 2007 Page 49 of 610
LW3
(255)*
63
REJ09B0131-0600
0
1
.
.
.
.
.
.
Section 3 Cache
LRU
6 bits
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