參數(shù)資料
型號： MC7457VG733NC
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 32-BIT, 733 MHz, RISC PROCESSOR, CBGA483
封裝： 29 X 29 MM, 3.22 MM HEIGHT, 1.27 MM PITCH, ROHS COMPLIANT, CERAMIC, BGA-483
文件頁數(shù)： 12/73頁
文件大小： 1715K
代理商： MC7457VG733NC
MPC7457 RISC Microprocessor Hardware Specifications, Rev. 7
2
Freescale Semiconductor
Features
high-bandwidth interface. The MPC7447 is identical to the MPC7457 except that it does not support the
L3 cache interface.
Figure 1 shows a block diagram of the MPC7457. The core is a high-performance superscalar design
supporting a double-precision floating-point unit and a SIMD multimedia unit.
The memory storage subsystem supports the MPX bus protocol and a subset of the 60x bus protocol to
main memory and other system resources. The L3 interface supports 1, 2, or 4 Mbytes of external SRAM
for L3 cache and/or private memory data. For systems implementing 4 Mbytes of SRAM, a maximum of
2 Mbytes may be used as cache; the remaining 2 Mbytes must be private memory.
Note that the MPC7457 is a footprint-compatible, drop-in replacement in a MPC7455 application if the
core power supply is 1.3 V.
2Features
This section summarizes features of the MPC7457 implementation of the PowerPC architecture.
Major features of the MPC7457 are as follows:
High-performance, superscalar microprocessor
— As many as four instructions can be fetched from the instruction cache at a time.
— As many as three instructions can be dispatched to the issue queues at a time.
— As many as 12 instructions can be in the instruction queue (IQ).
— As many as 16 instructions can be at some stage of execution simultaneously.
— Single-cycle execution for most instructions
— One instruction per clock cycle throughput for most instructions
— Seven-stage pipeline control
Eleven independent execution units and three register files
— Branch processing unit (BPU) features static and dynamic branch prediction
– 128-entry (32-set, four-way set associative) branch target instruction cache (BTIC), a cache
of branch instructions that have been encountered in branch/loop code sequences. If a target
instruction is in the BTIC, it is fetched into the instruction queue a cycle sooner than it can
be made available from the instruction cache. Typically, a fetch that hits the BTIC provides
the first four instructions in the target stream.
– 2048-entry branch history (BHT) with 2 bits per entry for 4 levels of prediction—not-taken,
strongly not-taken, taken, and strongly taken
– Up to three outstanding speculative branches
– Branch instructions that do not update the count register (CTR) or link register (LR) are
often removed from the instruction stream.
– Eight-entry link register stack to predict the target address of Branch Conditional to Link
Register (bclr) instructions
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