hm5216805 Renesas Electronics Corporation., hm5216805 Datasheet - Page 54

• Manufacturer Part Number: hm5216805
• Description: 16 M Lvttl Interface Sdram 100 Mhz/83 Mhz 1-mword 8-bit 2-bank/2-mword 4-bit 2-bank - Hitachi Semiconductor
• Manufacturer: Renesas Electronics Corporation.

HM5216805 Series, HM5216405 Series
Auto Refresh Cycle
Self Refresh Cycle
54
I/O(output)
I/O(output)
I/O(imput)
I/O(input)
DQMU
/DQML
Address
A11(BS)
A11(BS)
Address
/DQML
DQMU
CLK
CKE
RAS
CAS
WE
CAS
CKE
RAS
CS
CLK
WE
CS
Precharge command
If needed
V
Precharge
If needed
IH
A10=1
0
A10=1
1
t
RP
t
RP
Self refresh entry
command
2
Auto Refresh
3
CKE Low
4
5
Self refresh exit
ignore command
or No operation
6
t
RC
7
CKE High
I
SREX
8
High-Z
Auto Refresh
9
High-Z
Next
clock
enable
10
11
Self refresh entry
command
t
RC
12
13
14
t
RC
Next
clock
enable
Active
Bank 0
15
R:a
Auto
refresh
16
Read
Bank 0
17
C:a
Self refresh cycle
RAS-CAS delay = 3
CAS Latency = 3
Burst Length = 4
=V
Refresh cycle and
Read cycle
RAS-CAS delay=2
CAS latency=2
Burst length=4
18
IH
= V
or V
19
a
IH
IL
or V
a+1
20
IL