Hitachi SH7751 Hardware Manual page 176

(4) Data TLB Protection Violation Exception


Source: The access does not accord with the UTLB protection information (PR bits) shown
below.
PR Privileged Mode
00 Only read access possible
01 Read/write access possible
10 Only read access possible
11 Read/write access possible


Transition address: VBR + H'0000 0100


Transition operations:
The virtual address (32 bits) at which this exception occurred is set in TEA, and the
corresponding virtual page number (22 bits) is set in PTEH [31:10]. ASID in PTEH indicates
the ASID when this exception occurred.
The PC and SR contents for the instruction at which this exception occurred are saved in SPC
and SSR. The R15 contents at this time are saved in SGR.
Exception code H'0A0 (for a read access) or H'0C0 (for a write access) is set in EXPEVT. The
BL, MD, and RB bits are set to 1 in SR, and a branch is made to PC = VBR + H'0100.
Data_TLB_protection_violation_exception()
{
TEA = EXCEPTION_ADDRESS;
PTEH.VPN = PAGE_NUMBER;
SPC = PC;
SSR = SR;
SGR = R15;
EXPEVT = read_access ? H'000000A0 : H'000000C0;
SR.MD = 1;
SR.RB = 1;
SR.BL = 1;
PC = VBR + H'00000100;
}
User Mode
Access not possible
Access not possible
Only read access possible
Read/write access possible
Rev. 3.0, 04/02, page 137 of 1064