W986408CH Datasheet, PDF (34/44 Pages) Winbond – 2M x 8BIT x 4 BANKS SDRAM

W986408CH
Autoprecharge timing ( Read Cycle )
2M x 8 bit x 4 Banks SDRAM
01
(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
2 3 4 5 6 7 8 9 10 11
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