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DP8440VLJ-40 数据表(PDF) 21 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件名 DP8440VLJ-40
功能描述  microCMOS Programmable 16/64 Mbit Dynamic RAM Controller/Driver
PDF  46 Pages
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

DP8440VLJ-40 数据表(HTML) 21 Page - National Semiconductor (TI)

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60 Refresh Modes (Continued)
62 EXTERNALLY CONTROLLED REFRESH
The user can perform externally controlled refreshes by as-
serting the DISRFSH and RFSH input signals When these
inputs assert the DP844041 will perform a refresh as soon
as possible If the user keeps RFSH asserted with DISRFSH
already asserted the DRAM controller will burst refresh the
memory for as long as the inputs are valid The controller
will guarantee the RAS low and RAS precharge times for
every refresh The user can choose to monitor the output
RFRQ to externally request a refresh When RFRQ asserts
it indicates that the refresh counter has expired
TLF11718 – 11
FIGURE 15 Externally Controlled Refresh (2T of RAS Low and Precharge)
21



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