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MC7445ARX933LF Scheda tecnica(PDF) 7 Page - Freescale Semiconductor, Inc |
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MC7445ARX933LF Scheda tecnica(HTML) 7 Page - Freescale Semiconductor, Inc |
7 / 64 page MPC7455 RISC Microprocessor Hardware Specifications, Rev. 4.1 Freescale Semiconductor 7 Comparison with the MPC7400, MPC7410, MPC7450, MPC7451, and MPC7441 • Performance monitor can be used to help debug system designs and improve software efficiency • In-system testability and debugging features through JTAG boundary-scan capability • Testability — LSSD scan design — IEEE 1149.1 JTAG interface — Array built-in self test (ABIST)—factory test only • Reliability and serviceability — Parity checking on system bus and L3 cache bus — Parity checking on the L2 and L3 cache tag arrays 3 Comparison with the MPC7400, MPC7410, MPC7450, MPC7451, and MPC7441 Table 1 compares the key features of the MPC7455 with the key features of the earlier MPC7400, MPC7410, 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 MPC7455 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 MPC7455/MPC7445 MPC7450/MPC7451/ MPC7441 MPC7400/MPC7410 Basic Pipeline Functions Logic inversions per cycle 18 18 28 Pipeline stages up to execute 5 5 3 Total pipeline stages (minimum) 7 7 4 Pipeline maximum instruction throughput 3 + Branch 3 + Branch 2 + Branch Pipeline Resources Instruction buffer size 12 12 6 Completion buffer size 16 16 8 Renames (integer, float, vector) 16, 16, 16 16, 16, 16 6, 6, 6 Maximum Execution Throughput SFX 332 Vector 2 (Any 2 of 4 Units) 2 (Any 2 of 4 Units) 2 (Permute/Fixed) 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 × 2 Queues Vector units In Order, 4 Queues In Order, 4 Queues In Order, 2 Queues |
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