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MC7457RX1267LC Datasheet(PDF) 9 Page - Freescale Semiconductor, Inc |
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MC7457RX1267LC Datasheet(HTML) 9 Page - Freescale Semiconductor, Inc |
9 / 71 page Comparison with the MPC7455, MPC7445, MPC7450, MPC7451, and MPC7441 MPC7457 RISC Microprocessor Hardware Specifications, Rev. 8 Freescale Semiconductor 9 3 Comparison with the MPC7455, MPC7445, MPC7450, MPC7451, and MPC7441 Table 1 compares the key features of the MPC7457 with the key features of the earlier MPC7455, MPC7445, MPC7450, MPC7451, and MPC7441. To achieve a higher frequency, the number of logic levels per cycle is reduced. Also, to achieve this higher frequency, the pipeline of the MPC7457 is extended (compared to the MPC7400), while maintaining the same level of performance as measured by the number of instructions executed per cycle (IPC). Table 1. Microarchitecture Comparison Microarchitectural Specs MPC7457/MPC7447 MPC7455/MPC7445 MPC7450/MPC7451/ MPC7441 Basic Pipeline Functions Logic inversions per cycle 18 18 18 Pipeline stages up to execute 5 5 5 Total pipeline stages (minimum) 7 7 7 Pipeline maximum instruction throughput 3 + Branch 3 + Branch 3 + Branch Pipeline Resources Instruction buffer size 12 12 12 Completion buffer size 16 16 16 Renames (integer, float, vector) 16, 16, 16 16, 16, 16 16, 16, 16 Maximum Execution Throughput SFX 333 Vector 2 (any 2 of 4 units) 2 (any 2 of 4 units) 2 (any 2 of 4 units) Scalar floating-point 1 1 1 Out-of-Order Window Size in Execution Queues SFX integer units 1 entry × 3 queues 1 entry × 3 queues 1 entry × 3 queues Vector units In order, 4 queues In order, 4 queues In order, 4 queues Scalar floating-point unit In order In order In order Branch Processing Resources Prediction structures BTIC, BHT, link stack BTIC, BHT, link stack BTIC, BHT, link stack BTIC size, associativity 128-entry, 4-way 128-entry, 4-way 128-entry, 4-way BHT size 2K-entry 2K-entry 2K-entry Link stack depth 8 8 8 Unresolved branches supported 3 3 3 Branch taken penalty (BTIC hit) 1 1 1 |
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