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7721 Datasheet(PDF) 441 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) 441 Page - Renesas Technology Corp

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APPLICATION
7721 Group User’s Manual
16–38
16.1 Memory connection
(10) Example of DRAM connection (external bus width = 16 bits) 
AC157
00000016
00008016
00047F16
001FC016
001FFF16
F0000016
FFFFFF16
F7FFFF16
M5M44260CJ-7
MA0
MA1
MA2
MA3
MA4
MA5
MA6
MA7
MA8
RAS
CAS
M37721
A0
A1
A2
A3
A4
A5
A6
A7
A8
RAS
AC32
1A
1Y
V2
2A
2B
SELECT
2Y
ST
LCAS
UCAS
OE
W
1B
BLE
BHE
ST0
ST1
E
R/W
BYTE
25 MHz
V1
SFR area
Internal
RAM area
DRAM area
(M5M44260CJ)
V1 : Make sure that the
propagation delay time is
within 20 ns.
V2 : Make sure that the
propagation delay time is
within 7.5 ns.
SFR area
Not used
Not used
Memory map
Circuit condition : DRAM area select bits (bits 3 to 0 at address 6416) = “00012”
Not used
A16/D0
A17/D1
A18/D2
A19/D3
A20/D4
A21/D5
A22/D6
A23/D7
A8/D8
A9/D9
A10/D10
A11/D11
A12/D12
A13/D13
A14/D14
A15/D15
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
DQ8
DQ9
DQ10
DQ11
DQ12
DQ13
DQ14
DQ15
DQ16
XIN
XOUT
Fig. 16.1.34 Example of M5M44260CJ (256K ! 16 bits) connection (external bus width = 16 bits)



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