参数资料
型号: A80960HA25SL2GX
厂商: INTEL CORP
元件分类: 微控制器/微处理器
英文描述: 80960HA/HD/HT 32-Bit High-Performance Superscalar Processor
中文描述: 32-BIT, 25 MHz, RISC PROCESSOR, CPGA168
封装: PGA-168
文件页数: 72/102页
文件大小: 828K
代理商: A80960HA25SL2GX
80960HA/HD/HT
66
Advance Information
Datasheet
The processor can stall (BSTALL asserted) even with an empty bus queue (BREQ deasserted).
Depending on the instruction stream and memory wait states, the two signals can be separated by
several CLKIN cycles.
Bus arbitration logic that logically “ANDs” BSTALL and BREQ will not correctly grant the bus to
the processor in all stall cases, potentially degrading processor performance.
Do not logically “AND” BSTALL and BREQ together in arbitration logic. Instead, the simplest
bus arbitration should logically “OR” BSTALL and BREQ to determine the processor’s bus
ownership requirements.
More sophisticated arbitration should recognize the priority nature of these two signals. Using a
traffic light analogy, BREQ is a “yellow light” warning of a possible processor stall and BSTALL
is a “red light” indicating a stall in progress.
Figure 49. BREQ and BSTALL Operation
CLKIN
ADS
BLAST
BREQ
BSTALL
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