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參數(shù)資料
| 型號(hào)： | DP84432N |
| 英文描述： | DRAM Controller |
| 中文描述： | DRAM控制器 |
| 文件頁數(shù)： | 15/46頁 |
| 文件大小： | 644K |
| 代理商： | DP84432N |
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5.0 Accessing Modes
(Continued)
5.3 PAGE MODE ACCESS
When the DP8440/41 is programmed for Page Accesses,
every access after the opening access needs a new ad-
dress and a new ADS. During Page Mode the DRAM con-
troller keeps RAS asserted until there is a page miss detect-
ed. When a new access is requested,
CAS asserts from
the rising CLK edge that ADS is set up to for reads, and
is delayed 1 clock for writes.
DTACK asserts according to
the programming selection in bits R6–7. At the end of a
page access only CAS and DTACK negate and they negate
on the same clock edge.
During page accesses only CAS and DTACK toggle until
there is a page miss. When a page miss is detected, the
DP8440/41 will negate RAS and meet the programmed pre-
charge time. CPUs with page comparators can program the
DRAM controller’s page comparator as an input. When this
input asserts, it indicates that a page change has occurred,
RAS will negate and the controller will meet the precharge
time. Figure 8 shows an opening access followed by two
page accesses. The first page access is a ‘‘page hit,’’ the
second access is out of page.
TL/F/11718–7
FIGURE 8. Opening Access Followed by Page Accesses
15
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PDF描述 |
|---|---|
| DP8472 | Floppy Disk Controller |
| DP8472J | Floppy Disk Controller |
| DP8472N | Floppy Disk Controller |
| DP8473DB | Floppy Disk Controller |
| DP8474 | Floppy Disk Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DP84432N/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DRAM Controller |
| DP84432N/B+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:DRAM Controller |
| DP8450N-4 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Disk Data Separator/Synchronizer |
| DP8451J-3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Disk Data Separator/Synchronizer |
| DP8451J-4 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Disk Data Separator/Synchronizer |
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