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2.3.3 External SDRAM
Rev.1.00 June 1,2005 2-6
REJ11J0002-0100Z
2
2.3.3 External SDRAM
The M3A-HS60 includes two pcs. of 16-Mbyte SDRAM (for an external SDRAM) as standard equipment.
The SH7206's internal bus state controller can be used to control the SDRAM.
Note that the SDRAM can be switched between 32-bit bus access and 16-bit bus access. (For 16-bit bus access, only
one pc. of 16-Mbyte SDRAM can be used.)
Table2.3.3 lists SDRAM specifications used in M3A-HS60. Figure2.3.3 shows a block diagram of SDRAM.
Table2.3.3 SDRAM Specifications Used in M3A-HS60
Specification Content
Part number EDS1216AATA-75E
Configuration 16 Mbytes (16-bit bus width) x 2pcs.
Capacity 32 Mbytes
Access time 5.4ns
CAS latency 2 (At 66MHz bus clock)
Refresh interval 4,096 refresh cycles every 64ms
Row address A11- A0
Column address A8 - A0
Number of banks 4-bank operation controlled by BA0 and BA1
A15-1
SH7206
14
CKE
CS3#
RASL#
DQMUU
DQMUL
CKIO
CASL#
RD/WR#
DQMLU
DQMLL
MA11-0,BA1-0
EDS1216AATA
(8Mx16 bits)
RAS#
CKE
CS#
DQML
DQMU
CLK
CAS#
WE#
DQ15-DQ0
1OE#
2OE#
A[12:1], A14-13
32-bit Access
MA11-0,BA1-0
EDS1216AATA
(8Mx16 bits)
RAS#
CKE
CS#
DQML
DQMU
CLK
CAS#
WE#
DQ15-DQ0
3.3V
14
14
16
SH72060 D31-D1
6
16
SH72060 D15-D0
1OE#
2OE#
A[13:2], A15-14
16-bit Access
3.3V
SDRAM
bus size setting
SDRAM_SZ
SDRAM_SZ=Low:16-bit access using SDRAMx1
SDRAM_SZ=High:32-bit access using SDRAMx2
Figure2.3.3 Block Diagram of External SDRAM