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7733 Scheda tecnica(PDF) 739 Page - Renesas Technology Corp

Il numero della parte 7733
Spiegazioni elettronici  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  940 Pages
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Produttore elettronici  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7733 Scheda tecnica(HTML) 739 Page - Renesas Technology Corp

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APPLICA
TIONS
7735 Group User’s Manual
17–13
17.1 Memory expansion
 When using an external memory which outputs data within an interval of tpxz(RDE-DZ) after signal
____
RDE’s
falling edge
When there is a possibility that the tail of an address collides with the head of data because the
____
external memory outputs data within an interval of tpxz(RDE-DZ) after signal RDE’s falling edge, delay
____
only the signal RDE’s front falling edge and realize the relationship of tpxz(RDE-DZ)-d < ten(OE). In this
___
____
case, the falling edge of the read signal (OE) for the memory, which is generated from signal RDE,
is delayed. (Refer to Figure 17.1.7.)
Fig. 17.1.7 Timing example when data output is delayed
External memory
output enable signal
(Read signal)
Address output
External memory
data output
tpxz(RDE-DZ)
RDE
OE
d
Address
Address
Data
ten(OE)
ta(OE)
When ten(OE)
≤ tpxz(RDE-DZ)(= 5 ns), make sure that signal RDE’s falling
edge precedes signal OE’s falling edge (Refer to “d”) and the relationship
of tpxz(RED-DZ)-d
≤ ten(OE) is realized.
Note:



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