HYB25D512800BT Datasheet, PDF (25/90 Pages) Infineon Technologies AG – 512Mbit Double Data Rate SDRAM

HYB25D512[40/16/80]0B[E/F/C/T]
512Mbit Double Data Rate SDRAM
Functional Description
3.2.4 Operating Mode
The normal operating mode is selected by issuing a Mode Register Set Command with bits A7-A12 set to zero,
and bits A0-A6 set to the desired values. A DLL reset is initiated by issuing a Mode Register Set command with
bits A7 and A9-A12 each set to zero, bit A8 set to one, and bits A0-A6 set to the desired values. A Mode Register
Set command issued to reset the DLL should always be followed by a Mode Register Set command to select
normal operating mode.
All other combinations of values for A7-A12 are reserved for future use and/or test modes. Test modes and
reserved states should not be used as unknown operation or incompatibility with future versions may result.
CK
CK
Command
DQS
DQ
Read
NOP
CL=2
NOP
CAS Latency = 2, BL = 4
NOP
NOP
NOP
CK
CK
Command
DQS
DQ
Read
NOP
CL=2.5
NOP
Shown with nominal t_AC, t_DQSCK, and t_DQSQ.
Figure 6 Required CAS Latencies
CAS Latency = 2.5, BL = 4
NOP
NOP
NOP
Don’t Care
Data Sheet
25
Rev. 1.2, 2004-06