參數(shù)資料
型號(hào): DP8440V
英文描述: DRAM Controller
中文描述: DRAM控制器
文件頁數(shù): 25/46頁
文件大小: 644K
代理商: DP8440V
7.0 Wait Support
The DP8440/41 provide full wait support for all types of
accesses. Through the DTACK output, the user can insert
wait states to provide the necessary time for completing a
memory access. The user needs to program how DTACK
will assert during Opening, Page or Burst accesses. The
user can program DTACK to assert from the rising edge of
clock or from the falling edge of clock.
7.1 OPENING ACCESS
Figures 20 and 21 show DTACK during opening accesses.
DTACK asserts for only one clock cycle. CAS negates from
the same clock edge DTACK negates. When programmed
in Normal Mode, RAS will negate after the programmed
RAS low time. When programmed in Page Mode, RAS will
stay asserted until there is a page miss.
TL/F/11718–14
FIGURE 20. DTACK Programmed to Assert from a Positive Edge of Clock
TL/F/11718–15
FIGURE 21. DTACK Programmed to Assert from a Negative Edge of Clock
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