DP8422V datasheet(9/60 Pages) NSC

Part #	DP8422V

Description	microCMOS Programmable 256k/1M/4M Dynamic RAM Controller/Drivers

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Manufacturer	NSC [National Semiconductor (TI)]

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30 Programming and Resetting (Continued)

32 PROGRAMMING METHODS

321 Mode Load Only Programming

To use this method the user asserts ML enabling the inter-

nal programming register After ML is asserted a valid pro-

gramming selection is placed on the address bus B0 B1

and ECAS0 inputs then ML is negated When ML is negat-

ed the programming bits are latched into the internal pro-

gramming register and the DP8420V21V22V DP84T22 is

programmed see

Figure 6 When programming the chip

the controller must not be refreshing RFIP must be high (1)

to have a successful programming

322 Chip Selected Access Programming

The chip can also be programmed by performing a chip

selected access To program the chip using this method

ML is asserted then CS is asserted and a valid program-

ming selection is placed on the address bus When AREQ is

asserted the programming bits affecting the wait logic be-

come effective immediately then DTACK is asserted allow-

ing the access to terminate After the access ML is negated

and the rest of the programming bits take effect

TLF11109 – 7

FIGURE 6 ML Only Programming

TLF11109 – 8

FIGURE 7 CS Access Programming

9

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