AM29PL320DB30WPI datasheet(12/49 Pages) AMD

12 / 49 page

Am29PL320D

June 13, 2005

Page Mode Read

The Am29PL320D is capable of fast page mode read

and is compatible with the page mode Mask ROM read

operation. This mode provides faster read access

speed for random locations within a page. The page

size of the Am29PL320D device is 8 words, or 4 dou-

ble words, with the appropriate page being selected by

the higher address bits A19–A2 and the LSB bits A1–

A0 (in the double word mode) and A1 to A-1 (in the

word mode) determining the specific word/double word

within that page. This is an asynchronous operation

with the microprocessor supplying the specific word or

double word location.

The random or initial page access is equal to tACC or

tCE and subsequent page read accesses (as long as

the locations specified by the microprocessor falls

within that page) is equivalent to tPACC. When CE# is

deasserted and reasserted for a subsequent access,

the access time is tACC or tCE. Here again, CE# selects

the device and OE# is the output control and should be

used to gate data to the output inputs if the device is

selected. Fast page mode accesses are obtained by

keeping A19–A2 constant and changing A1 to A0 to

select the specific double word, or changing A1 to A-1

to select the specific word, within that page.

The following tables determine the specific word and

double word within the selected page:

Table 2.

Double Word Mode

Table 3.

Word Mode

Word

Double Word 0

Double Word 1

Double Word 2

Double Word 3

Word

A-1

Word 0

Word 1

Word 2

Word 3

Word 4

Word 5

Word 6

Word 7

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