Rev. 5.00, 09/03, page 61 of 760
3.1.4
Register Configuration
A register that has an undefined initial value must be initialized by software. Table 3.1 shows the
configuration of the MMU control registers.
Table 3.1
Register Configuration
Name
Abbreviation
R/W
Size
Initial
Value
*
1
Address
Page table entry register high
PTEH
R/W
Longword
Undefined
H'FFFFFFF0
Page table entry register low
PTEL
R/W
Longword
Undefined
H'FFFFFFF4
Translation table base register
TTB
R/W
Longword
Undefined
H'FFFFFFF8
TLB exception address register
TEA
R/W
Longword
Undefined
H'FFFFFFFC
MMU control register
MMUCR
R/W
Longword
*
2
H'FFFFFFE0
Notes: 1. Initialized by a power-on reset or manual reset.
2. SV bit: undefined
Other bits: 0
3.2
Register Description
There are five registers for MMU processing. These registers are located in address space area P4
and can only be accessed from privileged mode by specifying the address.
1. The page table entry register high (PTEH) register residing at address H'FFFFFFF0, which
consists of a virtual page number (VPN) and ASID. The VPN set is the VPN of the virtual
address at which the exception is generated in case of an MMU exception or address error
exception. When the page size is 4 kbytes, the VPN is the upper 20 bits of the virtual address,
but in this case the upper 22 bits of the virtual address are set. The VPN can also be modified
by software. As the ASID, software sets the number of the currently executing process. The
VPN and ASID are recorded in the TLB by the LDTLB instruction.
2. The page table entry register low (PTEL) register residing at address H'FFFFFFF4, and used to
store the physical page number and page management information to be recorded in the TLB
by the LDTLB instruction. The contents of this register are only modified in response to a
software command. (Refer to section 3.4.3, MMU Instruction (LDTLB), and section 3.5,
MMU Exceptions.)
3. The translation table base register (TTB) residing at address H'FFFFFFF8, which points to the
base address of the current page table. The hardware does not set any value in TTB
automatically. TTB is available to software for general purposes.
4. The TLB exception address register (TEA) residing at address H'FFFFFFFC, which stores the
virtual address corresponding to a TLB or address error exception. This value remains valid
until the next exception or interrupt.
Summary of Contents for SH7709S
Page 2: ......
Page 44: ...Rev 5 00 09 03 page xliv of xliv ...
Page 62: ...Rev 5 00 09 03 page 18 of 760 ...
Page 128: ...Rev 5 00 09 03 page 84 of 760 ...
Page 146: ...Rev 5 00 09 03 page 102 of 760 ...
Page 224: ...Rev 5 00 09 03 page 180 of 760 ...
Page 246: ...Rev 5 00 09 03 page 202 of 760 ...
Page 266: ...Rev 5 00 09 03 page 222 of 760 ...
Page 370: ...Rev 5 00 09 03 page 326 of 760 ...
Page 432: ...Rev 5 00 09 03 page 388 of 760 ...
Page 532: ...Rev 5 00 09 03 page 488 of 760 ...
Page 598: ...Rev 5 00 09 03 page 554 of 760 ...
Page 630: ...Rev 5 00 09 03 page 586 of 760 ...
Page 656: ...Rev 5 00 09 03 page 612 of 760 ...
Page 684: ...Rev 5 00 09 03 page 640 of 760 ...
Page 700: ...Rev 5 00 09 03 page 656 of 760 ...
Page 758: ...Rev 5 00 09 03 page 714 of 760 ...
Page 807: ...SH7709S Group Hardware Manual REJ09B0081 0500O ADE 602 250C ...