SH7760 Datasheet, PDF (207/1345 Pages) Renesas Technology Corp – SuperHTM RISC engine

3. IC address array write (associative)
When a write is performed with the A bit in the address field set to 1, the tag for each of the
ways stored in the entry specified in the address field is compared with the tag specified in the
data field. The way number set by bit [13] is not used. If the MMU is enabled at this time,
comparison is performed after the virtual address specified by data field bits [31:10] has been
translated to a physical address using the ITLB. If the addresses match and the V bit for that
way is 1, the V bit specified in the data field is written into the IC entry. In other cases, no
operation is performed. This operation is used to invalidate a specific IC entry. If an ITLB miss
occurs during address translation, or the comparison shows a mismatch, an exception is not
generated, no operation is performed, and the write is not executed. If an instruction TLB
multiple hit exception occurs during address translation, processing switches to the instruction
TLB multiple hit exception handling routine.
31
24 23
Address field _{1 1 1 1 0 0 0 0}
31
Data field
Tag
14 13 12
Entry
Way
10 9
543210
A
10
V
V : Validity bit
A : Association bit
: Reserved bits (write value should be 0, and read value is undefined )
Figure 7.9 Memory-Mapped IC Address Array
7.6.2 IC Data Array
The IC data array is allocated to addresses H'F100 0000 to H'F1FF FFFF in the P4 area. A data
array access requires a 32-bit address field specification (when reading or writing) and a 32-bit
data field specification. The way and entry to be accessed are specified in the address field, and
the longword data to be written is specified in the data field.
In the address field, bits [31:24] have the value H'F1 indicating the IC data array, the way is
specified by bit [13], and the entry by bits [12:5]. The IIX bit in CCR has no effect on this entry
specification. Address field bits [4:2] are used for the longword data specification in the entry. As
only longword access is used, 0 should be specified for address field bits [1:0].
The data field is used for the longword data specification.
Rev. 1.0, 02/03, page 157 of 1294