SH7713 datasheet(267/904 Pages) RENESAS

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Section 6 Cache

Rev.1.50 Aug. 30, 2006 Page 227 of 860

REJ09B0288-0150

address and LRU bits remain unchanged. When there is no way that receives a hit, nothing is

written and there is no operation. This function is used to invalidate a specific entry in the cache.

When the U bit of the entry that has received a hit is 1 at this point, writing back should be

performed. However, when 0 is written to the V bit, 0 must also be written to the U bit of that

entry.

6.4.2

Data Array

The data array is mapped onto H'F1000000 to H'F1FFFFFF. To access a data array, the 32-bit

address field (for read/write accesses) and 32-bit data field (for write accesses) must be specified.

The address field specifies information for selecting the entry to be accessed; the data field

specifies the longword data to be written to the data array.

In the address field, specify the entry address for selecting the entry, L for indicating the longword

position within the (16-byte) line, W for selecting the way, and H'F1 for indicating data array

access. As for L, 00 indicates longword 0, 01 indicates longword 1, 10 indicates longword 2, and

11 indicates longword 3. As for W, 00 indicates way 0, 01 indicates way 1, 10 indicates way 2,

and 11 indicates way 3.

Since access size of the data array is fixed at longword, bits 1 and 0 of the address field should be

set to 00.

Figures 6.4 and 6.5 show the address and data formats.

The following two operations on the data array are available. The information in the address array

is not affected by these operations.

Data-Array Read: Read the data specified by L of the address filed, from the entry that

corresponds to the entry address and the way that is specified by the address filed.

Data-Array Write: Write the longword data specified by the data filed, to the position specified

by L of the address field, in the entry that corresponds to the entry address and the way specified

by the address field.

SH7713 Datasheet(PDF) 267 Page - Renesas Technology Corp