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7721 Datasheet(PDF) 439 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) 439 Page - Renesas Technology Corp

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APPLICATION
7721 Group User’s Manual
16–36
16.1 Memory connection
(9)
Example of DRAM connection (external bus width = 16 bits) 
00000016
00008016
00047F16
001FC016
001FFF16
E0000016
FFFFFF16
M5M44400CJ-7
MA0
MA1
MA2
MA3
MA4
MA5
MA6
MA7
MA8
MA9
RAS
CAS
E
R/W
BLE
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
M37721
AC32
WL
WH
BHE
XIN
XOUT
25 MHz
BYTE
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
RAS
CAS
OE
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
RAS
CAS
OE
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
RAS
CAS
OE
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
RAS
CAS
OE
V
SFR area
Internal
RAM area
DRAM area
(M5M4400CJ
! 4)
V : Make sure that the propagation
delay time is within 40 ns.
SFR area
Not used
Not used
Memory map
Circuit condition : DRAM area select bits (bits 3 to 0 at address 6416) = “0010 2”
Fig. 16.1.32 Example of M5M44400CJ (1M ! 4 bits) connection (external bus width = 16 bits)



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