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7721 Datasheet(PDF) 421 Page - Renesas Technology Corp

Part # 7721
Description  16-BIT SINGLE-CHIP MICROCOMPUTER
PDF  577 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7721 Datasheet(HTML) 421 Page - Renesas Technology Corp

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APPLICATION
7721 Group User’s Manual
16–18
16.1 Memory connection
M37721
CNVss
A0–A7
BYTE
ALE
A8/D8–A15/D15
E
R/W
BHE
BLE
XIN
XOUT
A16/D0–A23/D7
Address bus
AB
DIR OC
AB
DIR OC
AC245
DQ
LE OE
AC573
DQ
LE OE
AC573
RD
WO
WE
AC32
AC04
AC32
25 MHz
1D 1Q
1T
2D
2T 2Q
AC04
AC74
1
1
AC245
Data bus (even)
Data bus (odd)
V2
V2
These circuits make the occurrence of the
write signal’s rising edge earlier by 1/2 1
,
so that the write hold time is extended.
Circuit condition : Software Wait
V1: Make sure that the propagation delay time is within 20 ns.
V2: Make sure that the output disable time is within 20 ns.
V1
Fig. 16.1.14 Example for using bus buffers (2) (connecting with memory requiring long data hold time
for writing)



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