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 floating-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.
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- Virtual memory support for up to 4 exabytes (2 ) virtual memory.
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- Real memory support for up to 4 gigabytes (2 ) 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 flow-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 specifica-
tion supports the L2 frequency range specified in Section “L2 Clock AC Specifications,” on page 16.
For higher L2 frequencies not supported in this document, please contact your IBM marketing repre-
sentative.
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Version 1.51
PowerPC 740 and PowerPC 750 Datasheet
5/20/99
IBM [ IBM ]
