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2.3.3 External Synchronous DRAM
Rev.1.01
Oct 28, .2008 2-6
REJ10J1351-0101
2
2.3.3 External Synchronous DRAM (SDRAM)
The M3A-HS19 is provided with a 16-MB synchronous DRAM (SDRAM) as an external main memory. The SDRAM is
controlled by the SH7619 on-chip bus state controller. The SDRAM is accessed in 16-bit bus.
Table 2.3.3 lists SDRAM specifications used on the M3A-HS19, and Figure 2.3.3 shows its block diagram.
Table 2.3.3 SDRAM Specifications
Items Description
Part Number EDS1216AATA-75E
Configuration 16 MB (16-bit bus width) x 1
Capacity 16 MB
Access Time 5.4 ns
CAS Latency 2 (at 62.5 MHz bus clock)
Refresh Interval 4,096 refresh cycles in every 64 ms
Row Address A11- A0
Column Address A8 - A0
Number of Banks 4-banks controlled by BA0, BA1
A12-1
SH7619(U1)
11
CKE
CS3#
RAS#
CKIO
CAS#
RD/WR#
DQMLU
DQMLL
A11-0
EDS1216AATA-75(U3)
(
2 M x 16 bits x 4-bank)
RAS#
CKE
CS#
DQML
DQMU
CLK
CAS#
WE#
3.3V
2
A14-13 BA1-0
D15-0
16
16
DQ15-DQ0
Figure 2.3.3 External SDRAM Block Diagram