r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 34

• Manufacturer Part Number: r8a77850anbg
• Description: Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

1. Overview
Rev.1.00 Jan. 10, 2008 Page 4 of 1658
REJ09B0261-0100
Item
Memory
management
unit (MMU)
Cache memory
LRAM
Features
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4-Gbyte address space, 256 address space identifiers (8-bit ASID)
Supports single virtual memory mode and multiple virtual memory mode
Multiple page sizes: 1, 4, 8, 64, or 256 Kbytes, or 1, 4, or 64 Mbytes
4-entry fully associative TLB for instructions
64-entry fully associative TLB for instructions and operands
Selection of software-driven or random-counter replacement algorithms
The TLB is address-mapped, making its contents directly accessible.
29-bit physical address mode/32-bit extended mode
Instruction cache (IC)
⎯ 32-Kbyte 4-way set associative
⎯ 256 entries/way, 32-byte block length
Operand cache (OC)
⎯ 32-Kbyte 4-way set associative
⎯ 256 entries/way, 32-byte block length
Selectable write method (copy-back or write-through)
Store queue (32 bytes × 2 entries)
One-stage copy-back buffer and one-stage write-through buffer
ILRAM
⎯ 8-Kbyte high-speed memory
⎯ Three independent read/write ports
⎯ 8-/16-/32-/64-bit access from the CPU or FPU
⎯ 8-/16-/32-/64-bit access and 16-/32-byte access in response to
⎯ Support for protection of memory from CPU or FPU access
OLRAM
⎯ 16-Kbyte high-speed memory
⎯ Three independent read/write ports
⎯ 8-/16-/32-/64-bit access by the CPU or the FPU
⎯ 8-/16-/32-/64-bit access and 16-/32-byte access in response to
⎯ Support for protection of memory from CPU or FPU access
external requests
external requests