參數(shù)資料
型號: DP8440V
英文描述: DRAM Controller
中文描述: DRAM控制器
文件頁數(shù): 43/46頁
文件大?。?/td> 644K
代理商: DP8440V
13.0 Errata for DP8440/41
(Continued)
ERRATUM
Y
5
When operating in Page Mode, an access cannot start on
the clock edge immediately following the negation of
DTACK. If back-to-back accesses are done in this way, the
CAS signals will remain low during a refresh as shown in the
timing diagram.
Recommended Fix
There should be at least one idle clock between the nega-
tion of DTACK and the start of a new access.
Illegal Back-to-Back Accesses in Page Mode
TL/F/11718–45
ERRATUM
Y
6
When starting a page access, there is a hold time from the
rising edge of the clock when ADS cannot assert. This hold
time (parameter 423 in the datasheet) is 4 ns and only ap-
plies when operating in Page Mode.
Recommended Fix
ADS assertion should be delayed at least 4 ns from the
rising edge of the clock when in Page Mode operation.
Parameter 423: ADS Hold Time before Assertion
TL/F/11718–46
43
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