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Version 1.51
PowerPC 740 and PowerPC 750 Datasheet
5/20/99
PowerPC 740 and PowerPC 750 Embedded Microprocessor
IBM CMOS 0.20 um Copper Technology EMPPC740L and EMPPC750L
Floating-point unit
- Support for IEEE-754 standard single- and double-precision oating-point arithmetic.
- 3 cycle latency, 1 cycle throughput, single-precision multiply-add.
- 3 cycle latency, 1 cycle throughput, double-precision add.
- 4 cycle latency, 2 cycle throughput, double-precision multiply-add.
- Hardware support for divide.
- Hardware support for denormalized numbers.
- Time deterministic non-IEEE mode.
System unit
- Executes CR logical instructions and miscellaneous system instructions.
- 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 (Not available on the 740)
- 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.