hm5216805 Renesas Electronics Corporation., hm5216805 Datasheet - Page 14

• 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
Function Truth Table
The following table shows the operations that are performed when each command is issued in each mode of
the synchronous DRAM.
Current state
Precharge
Idle
Row active
14
CS
H
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
H
L
L
L
L
L
L
L
L
RAS CAS WE
H
H
H
H
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
L
L
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
Address
BA, CA, A10
BA, CA, A10
BA, RA
BA, A10
MODE
BA, CA, A10
BA, CA, A10
BA, RA
BA, A10
MODE
BA, CA, A10
BA, CA, A10
BA, RA
BA, A10
MODE
Command
DESL
NOP
BST
READ/READ A
WRIT/WRIT A
ACTV
PRE, PALL
REF, SELF
MRS
DESL
NOP
BST
READ/READ A
WRIT/WRIT A
ACTV
PRE, PALL
REF, SELF
MRS
DESL
NOP
BST
READ/READ A
WRIT/WRIT A
ACTV
PRE, PALL
REF, SELF
MRS
Operation
Enter IDLE after t
Enter IDLE after t
NOP
ILLEGAL
ILLEGAL
ILLEGAL
NOP
ILLEGAL
ILLEGAL
NOP
NOP
NOP
ILLEGAL
ILLEGAL
Bank and row active
NOP
Refresh
Mode register set
NOP
NOP
NOP
Begin read
Begin write
Other bank active
ILLEGAL on same bank*
Precharge
ILLEGAL
ILLEGAL
RP
RP
3