7721 datasheet(425/577 Pages) RENESAS

425 / 577 page

APPLICATION

7721 Group User’s Manual

16–22

16.1 Memory connection

(2)

Example of flash memory and SRAM connection (maximum model)

SFR area

Internal RAM area

External ROM area

(M5M28F102AFP)

000016

008016

048016

1FC016

200016

1FFFF16

Memory map

External RAM area

(M5M5256DP ! 2)

2000016

2FFFF16

Circuit condition : Software Wait

M37721

A1–A7

BYTE

ALE

A8/D8–A15/D15

R/W

BHE

BLE

XIN

XOUT

A16/D0–A18/D2

Address bus

Data bus (odd)

AC573

AC04

AC139

A0–A14

M5M5256DP-70LL

DQ1–DQ8

A0–A14

M5M5256DP-70LL

DQ1–DQ8

A0–A15

M5M28F102AFP

-10

D0–D15

AC32

D3–D7

A8–A16

A1–A15

D8–D15

A1–A15

D0–D7

A1–A16

D0–D15

A18

A17

25 MHz

SFR area

External ROM area

(M5M28F102AFP)

V1, V2: Make sure that the sum of propagation delay time is within 30 ns.

V3, V4: Make sure that the sum of propagation delay time is within 20 ns.

V5: Make sure that the propagation delay time is within 5 ns.

Data bus (even)

Fig. 16.1.18 Example of flash memory and SRAM connection (maximum model)

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