SH7058 Datasheet, PDF (133/1130 Pages) Renesas Technology Corp – Renesas SuperHTM RISC engine

6.3 Address Errors
6.3.1 Address Error Sources
Address errors occur when instructions are fetched or data read or written, as shown in table 6.6.
Table 6.6 Bus Cycles and Address Errors
Bus Cycle
Type
Bus
Master
Bus Cycle Description
Address Errors
Instruction
fetch
CPU
Instruction fetched from even address
Instruction fetched from odd address
None (normal)
Address error occurs
Instruction fetched from other than on-chip
peripheral module space*
None (normal)
Instruction fetched from on-chip peripheral
module space*
Address error occurs
Instruction fetched from external memory
space when in single chip mode
Address error occurs
Data
read/write
CPU or
DMAC
Word data accessed from even address
Word data accessed from odd address
None (normal)
Address error occurs
Longword data accessed from a longword
boundary
None (normal)
Longword data accessed from other than a Address error occurs
long-word boundary
Byte or word data accessed in on-chip
peripheral module space*
None (normal)
Longword data accessed in 16-bit on-chip
peripheral module space*
None (normal)
Longword data accessed in 8-bit on-chip
peripheral module space*
Address error occurs
External memory space accessed when in
single chip mode
Address error occurs
Note: * See section 9, Bus State Controller (BSC), for details of the on-chip peripheral module
space.
Rev. 3.0, 09/04, page 92 of 1086