W981216AH Datasheet, PDF (34/44 Pages) Winbond – 2M x 16 bit x 4 Banks SDRAM

W981216AH
Autoprecharge timing ( Read Cycle )
2M x 16 bit x 4 Banks SDRAM
0
1
2
3
4
5
6
7
8
9 10 11
(3) CAS Latency=4
( a ) burst length = 1
Command
Read
AP
DQ
( b ) burst length = 2
Command
Read
DQ
( c ) burst length = 4
Command
Read
DQ
( d ) burst length = 8
Command
Read
DQ
tRP
AP
Act
Q0
Act
tRP
Q0 Q1
AP
Act
tRP
Q0 Q1 Q2 Q3
AP
Act
tRP
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
Note )
Read
represents the Read with Auto precharge command.
AP
represents the start of internal precharging.
Act
represents the Bank Activate command.
When the Auto precharge command is asserted, the period from Bank Activate
command to the start of internal precgarging must be at least tRAS(min).
Revision 1.0
- 34 -
Publication Release Date: March, 1999