7721 datasheet(432/577 Pages) RENESAS

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APPLICATION

7721 Group User’s Manual

16–29

16.1 Memory connection

Fig. 16.1.25 Timing chart for example of M5M44400CJ (1M ! 4 bits) connection (external bus width = 8 bits)

(OE)

RAS

CAS

MA0–MA9

A16/D0–

A23/D7

tw(EL) = 135 (min)

tw(RASL) = 120 (min)

tw(CASL) = 92.5 (min)

td(RAS-CAS) = 28 (min)

tw(RASH) = 60 (min)

td(E-RASL) = 30 (max)

td(RA-RAS) = 5 (min)

td(E-CA) = 60 (max)

Input data

Address

tOEAV = 20 (max)

tRACV = 70 (max)

tCLZV = 5 (min)

tCACV = 20 (max)

tpzx(E-DLZ) = 20 (min)

td(CA-CAS) = 5 (min)

td(E-CASL) = 77.5 (max)

Row address

Column address

tAAV = 35 (max)

tsu(DL-E)

≥ 30

tOEZV = 0–20

tw(EL) = 135 (min)

tw(RASL) = 120 (min)

tw(CASL) = 55 (min)

tw(RASH) = 60 (min)

td(R/W-E) = 20 (min)

td(E-CASL) = 80–115

MA0–MA9

A16/D0–

A23/D7

V : Specifications of M5M44400CJ-7

The others are specifications of M37721.

Address

Data

AC32(tPHL)

tWCSV = 0 (min)

tWCHV = 15 (min)

td(RA-RAS) = 5 (min)

th(RAS-RA) = 18 (min)

AC32(tPHL)

th(CAS-CA) = 60 (min)

td(CA-CAS) = 10 (min)

tDHV = 15 (min)

th(E-DLQ) = 18 (min)

Row address

Column address

(Unit : ns)

RAS

CAS

R/W

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