參數資料
型號: MCF5280CVM80J
廠商: Freescale Semiconductor
文件頁數: 512/766頁
文件大?。?/td> 0K
描述: IC MPU RISC 80MHZ 256-MAPBGA
標準包裝: 90
系列: MCF528x
核心處理器: Coldfire V2
芯體尺寸: 32-位
速度: 80MHz
連通性: CAN,EBI/EMI,以太網,I²C,SPI,UART/USART
外圍設備: DMA,LVD,POR,PWM,WDT
輸入/輸出數: 150
程序存儲器類型: ROMless
RAM 容量: 64K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 3.6 V
數據轉換器: A/D 8x10b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 256-LBGA
包裝: 托盤
ColdFire Core
2-10
Freescale Semiconductor
Figure 2-10. Version 2 ColdFire Processor Operand Execution Pipeline Diagram
The instruction fetch pipeline prefetches instructions from local memory using a two-stage structure. For
sequential prefetches, the next instruction address is generated by adding four to the last prefetch address.
This function is performed during the IAG stage and the resulting prefetch address gated onto the core bus
(if there are no pending operand memory accesses assigned a higher priority). After the prefetch address
is driven onto the core bus, the instruction fetch cycle accesses the appropriate local memory and returns
the instruction read data back to the IFP during the cycle. If the accessed data is not present in a local
memory (e.g., an instruction cache miss, or an external access cycle is required), the IFP is stalled in the
IC stage until the referenced data is available. As the prefetch data arrives in the IFP, it can be loaded into
the FIFO instruction buffer or gated directly into the OEP.
The V2 design uses a simple static conditional branch prediction algorithm (forward-assumed as
not-taken, backward-assumed as taken), and all change-of-flow operations are calculated by the OEP and
the target instruction address fed back to the IFP.
The IFP and OEP are decoupled by the FIFO instruction buffer, allowing instruction prefetching to occur
with the available core bus bandwidth not used for operand memory accesses. For the V2 design, the
instruction buffer contains three 32-bit locations.
Consider the operation of the OEP for three basic classes of non-branch instructions:
Register-to-register:
op
Ry,Rx
Embedded load:
op
<mem>y,Rx
Register-to-memory (store)
move
Ry,<mem>x
For simple register-to-register instructions, the first stage of the OEP performs the instruction decode and
fetching of the required register operands (OC) from the dual-ported register file, while the actual
DSOC
AGEX
Opword
Extension 1
Extension 2
Core Bus
Read Data
Core Bus
Address
Core Bus
Write Data
RGF
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3
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