參數(shù)資料
型號: intel386 DX
廠商: Intel Corp.
英文描述: 32-Bit CHMOS Microprocessor With Integrated Memory Management(32位CHMOS 微處理器帶集成存儲管理)
中文描述: 32位CHMOS微處理器集成內(nèi)存管理(32位CHMOS微處理器帶集成存儲管理)
文件頁數(shù): 75/139頁
文件大?。?/td> 1587K
代理商: INTEL386 DX
Intel386
TM
DX MICROPROCESSOR
Pipelined address timing is useful in typical systems
having address latches. In those systems, once an
address has been latched, pipelined availability of
the next address allows decoding circuitry to gener-
ate chip selects (and other necessary select signals)
in advance, so selected devices are accessed im-
mediately when the next cycle begins. In other
words, the decode time for the next cycle can be
overlapped with the end of the current cycle.
If a system contains a memory structure of two or
more interleaved memory banks, pipelined address
timing potentially allows even more overlap of activi-
ty. This is true when the interleaved memory control-
ler is designed to allow the next memory operation
to begin in one memory bank while the current bus
cycle is still activating another memory bank. Figure
5-10 shows the general structure of the Intel386 DX
with 2-bank and 4-bank interleaved memory. Note
each memory bank of the interleaved memory has
full data bus width (32-bit data width typically, unless
16-bit bus size is selected).
Further details of pipelined address timing are given
in
5.4.3.4 Pipelined Address, 5.4.3.5 Initiating and
Maintaining Pipelined Address, 5.4.3.6 Pipelined
Address with Dynamic Bus Sizing,
and
5.4.3.7
Maximum Pipelined Address Usage with 16-Bit
Bus Size
.
TWO-BANK INTERLEAVED MEMORY
a) Address signal A2 selects bank
b) 32-bit datapath to each bank
231630–13
FOUR-BANK INTERLEAVED MEMORY
a) Address signals A3 and A2 select bank
b) 32-bit datapath to each bank
231630–14
Figure 5-10. 2-Bank and 4-Bank Interleaved Memory Structure
75
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