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7721 Datasheet(PDF) 437 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) 437 Page - Renesas Technology Corp

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APPLICATION
7721 Group User’s Manual
16–34
16.1 Memory connection
(8)
Example of DRAM connection (external bus width = 16 bits) Ž
00000016
00008016
00047F16
001FC016
001FFF16
E0000016
FFFFFF16
MA0
MA1
MA2
MA3
MA4
MA5
MA6
MA7
MA8
MA9
RAS
CAS
E
M37721
M5M417800CJ-7
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
RAS
CAS
OE
W
10
RAS
CAS
OE
4
W
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
DQ8
D8
D9
D10
D11
D12
D13
D14
D15
XIN
XOUT
25 MHz
BYTE
A16/D0
A17/D1
A18/D2
A19/D3
A20/D4
A21/D5
A22/D6
A23/D7
ALE
A8/D8
A9/D9
A10/D10
A11/D11
A12/D12
A13/D13
A14/D14
A15/D15
V2
D0
D1
D2
D3
D4
D5
D6
D7
AC573
LE
OE
8
Q4
D0
D1
D2
D3
D4
D5
D6
D7
M5M417800CJ-7
AC32
WL
WH
V1
R/W
BLE
BHE
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
DQ8
SFR area
Internal
RAM area
DRAM area
(M5M417800CJ
! 2)
V1 : Make sure that the
propagation delay time is
within 40 ns.
V2 : Make sure that the
propagation delay time is
within 15 ns.
SFR area
Not used
Not used
Memory map
Circuit condition : DRAM area select bits (bits 3 to 0 at address 6416) = “00102”
Fig. 16.1.30 Example of M5M417800CJ (2M ! 8 bits) connection (external bus width = 16 bits)



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