參數(shù)資料
型號(hào): HYB25D256400BT-8
英文描述: ?256Mbit (64Mx4) DDR200 (2-2-2)?
中文描述: ?的256Mbit(64Mx4)DDR200(2-2-2)?
文件頁(yè)數(shù): 12/76頁(yè)
文件大?。?/td> 1218K
代理商: HYB25D256400BT-8
HYB25D128400/800/160AT(L)
128-Mbit Double Data Rate SDRAM
Page 12 of 76
2002-05-06
Operating Mode
The normal operating mode is selected by issuing a Mode Register Set Command with bits A7-A11 set to
zero, and bits A0-A6 set to the desired values. A DLL reset is initiated by issuing a Mode Register Set com-
mand with bits A7 and A
9
-A11 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-A11 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.
Required CAS Latencies
N
OP
N
OP
N
OP
N
OP
N
OP
Read
CAS Latency = 2, BL = 4
Shown with nominal t
AC
, t
DQSCK
, and t
DQSQ
.
CK
CK
Command
DQS
DQ
Don’t Care
CL=2
N
OP
N
OP
N
OP
N
OP
N
OP
Read
CAS Latency = 2.5, BL = 4
CK
CK
Command
DQS
DQ
CL=2.5
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