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MPC7448 Datasheet(PDF) 7 Page - Freescale Semiconductor, Inc |
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MPC7448 Datasheet(HTML) 7 Page - Freescale Semiconductor, Inc |
7 / 60 page MPC7448 RISC Microprocessor Hardware Specifications, Rev. 4 Freescale Semiconductor 7 Comparison with the MPC7447A, MPC7447, MPC7445, and MPC7441 • Reliability and serviceability — Parity checking on system bus — Parity checking on the L1 caches and L2 data tags — ECC or parity checking on L2 data 3 Comparison with the MPC7447A, MPC7447, MPC7445, and MPC7441 Table 1 compares the key features of the MPC7448 with the key features of the earlier MPC7447A, MPC7447, MPC7445, and MPC7441. All are based on the MPC7450 RISC microprocessor and are architecturally very similar. The MPC7448 is identical to the MPC7447A, but the MPC7448 supports 1 Mbyte of L2 cache with ECC and the use of dynamic frequency switching (DFS) with more bus-to-core ratios. Table 1. Microarchitecture Comparison Microarchitectural Specs MPC7448 MPC7447A MPC7447 MPC7445 MPC7441 Basic Pipeline Functions Logic inversions per cycle 18 Pipeline stages up to execute 5 Total pipeline stages (minimum) 7 Pipeline maximum instruction throughput 3 + branch Pipeline Resources Instruction buffer size 12 Completion buffer size 16 Renames (integer, float, vector) 16, 16, 16 Maximum Execution Throughput SFX 3 Vector 2 (any 2 of 4 units) Scalar floating-point 1 Out-of-Order Window Size in Execution Queues SFX integer units 1 entry × 3 queues Vector units In order, 4 queues Scalar floating-point unit In order Branch Processing Resources Prediction structures BTIC, BHT, link stack BTIC size, associativity 128-entry, 4-way BHT size 2K-entry Link stack depth 8 Unresolved branches supported 3 Branch taken penalty (BTIC hit) 1 Minimum misprediction penalty 6 |
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