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Page 4
Version 2.0
Datasheet
9/30/99
PowerPC 750 SCM RISC Microprocessor
PID8p-750
Preliminary Copy
- Special register transfer instructions.
Cache structure
- 32K, 32-byte line, 8-way set associative instruction cache.
- 32K, 32-byte line, 8-way set associative data cache.
- Single-cycle cache access.
- Pseudo-LRU replacement.
- Copy-back or write-through data cache (on a page per page basis).
- Supports all PowerPC memory coherency modes.
- Non-blocking instruction and data cache (one outstanding miss under hits).
- No snooping of instruction cache.
Memory management unit
- 128 entry, 2-way set associative instruction TLB.
- 128 entry, 2-way set associative data TLB.
- Hardware reload for TLB's.
- 4 instruction BAT's and 4 data BATs.
- Virtual memory support for up to 4 exabytes (252) virtual memory.
- Real memory support for up to 4 gigabytes (232) of physical memory.
Level 2 (L2) cache interface
- Internal L2 cache controller and 4K-entry tags; external data SRAMs.
- 256K, 512K, and 1 Mbyte 2-way set associative L2 cache support.
- Copy-back or write-through data cache (on a page basis, or for all L2).
- 64-byte (256K/512K) and 128-byte (l-Mbyte) sectored line size.
- Supports ow-through (reg-buf) synchronous burst SRAMs, pipelined (reg-reg) synchronous burst
SRAMs, and pipelined (reg-reg) late-write synchronous burst SRAMs.
- Design supports Core-to-L2 frequency divisors of
÷1, ÷1.5, ÷2, ÷2.5, and ÷3. However, this specica-
For higher L2 frequencies not supported in this document, please contact your IBM marketing repre-
sentative.
Bus interface
- Compatible with 60x processor interface.
- 32-bit address bus.
- 64-bit data bus.
- Bus-to-core frequency multipliers of 3x, 3.5x, 4x, 4.5x, 5x, 5.5x, 6x, 6.5x, 7x, 7.5x, 8x and 10x sup-
ported (10x on rev level dd3.x only).
Integrated power management
- Low-power 2.0/3.3V design.
- Three static power saving modes: doze, nap, and sleep.
- Automatic dynamic power reduction when internal functional units are idle.
Integrated Thermal Management Assist Unit
- On-chip thermal sensor and control logic.
- Thermal Management Interrupt for software regulation of junction temperature.
Testability
- LSSD scan design.
- JTAG interface.
Reliability and serviceability–Parity checking on 60x and L2 cache buses