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FMS1616LAX-XXEX Datasheet - Page 43

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Table 9. CKE
[50.51.52.53.]
.
CKE
CKE
n-1
L
L
L
H
H
L
H
H
Note :
50. CKE
is the logic state of CKE at clock edge n; CKE
n
51. Current State is the state of the SDRAM immediatly prior to the clock edge n.
52. Command
is the command registered at clock edge n , and Action
n
53. All states and sequences not shown are illegal or reserved.
54. Exiting power down at clock edge n will put the device in all the banks idle state in time for clock edge n+1(provided the t
55. Exiting self refresh at clock edge n will put the device in all the banks idle state once t
occuring during the t
period. A minimum of two NOP commands must be provided during the t
XSR
56. After exiting clock suspend at clock edge n, the device will resume operation and recognize the next command at clock edge n+1.
Table 10. Curent State Bank n, Command to Bank n
Current State
CS#
RAS#
H
X
Any
L
H
L
L
L
L
Idle
L
L
L
L
Note :
57. This table applies when CKE
was HIGH and CKE
n-1
58. This table is bank-specific, except where noted; i.e., the current state is for a specific bank and the commands shown are those allowed to be issued to that bank when in that
state. Exceptions are covered in the notes below.
59. Current state definitions: Idle: The bank has been precharged, and t
bursts/accesses and no register accesses are in progress. Read: A READ burst has been initiated, with auto precharge disabled, and has not yet terminated or been terminated.
Write: A WRITE burst has been initiated, with auto precharge disabled, and has not yet terminated or been terminated.
60. The following states must not be interrupted by a command issued to the same bank. COMMAND INHIBIT or NOP commands, or allowable commands to the other bank
should be issued on any clock edge occurring during these states. Allowable commands to the other bank are determined by its current state and Table 10. and according to
Table 11. . Precharging: Starts with registration of a PRECHARGE command and ends when t
Starts with registration of an ACTIVE command and ends when t
Starts with registration of a READ command with auto precharge enabled and ends when t
Precharge Enabled: Starts with registration of a WRITE command with auto precharge enabled and ends when t
state.
61. The following states must not be interrupted by any executable command; COMMAND INHIBIT or NOP commands must be applied on each positive clock edge during these
states. Refreshing: Starts with registration of an AUTO REFRESH command and ends when t
Mode Register: Starts with registration of a LOAD MODE REGISTER command and ends when t
state. Precharging All: Starts with registration of a PRECHARGE ALL command and ends when t
62. All states and sequences not shown are illegal or reserved.
63. Not bank-specific; requires that all banks are idle.
64. May or may not be bank-specific; if all banks are to be precharged, all must be in a valid state for precharging.
65. Not bank-specific; BURST TERMINATE affects the most recent READ or WRITE burst, regardless of bank.
66. READs or WRITEs listed in the Command (Action) column include READs or WRITEs with auto precharge enabled and READs or WRITEs with auto precharge disabled.
67. Does not affect the state of the bank and acts as a NOP to that bank.
Rev0.3, May., 2010
Current State
n
Power Down
Self Refresh
Clock Suspend
Power Down
[54.]
Command Inhibit or NOP
Self Refresh
Command Inhibit or NOP
[55.]
Clock Suspend
[56.]
All Banks Idle
Command Inhibit or NOP
All Banks Idle
Reading or Writing
was the state of CKE at the previous clock edge.
n-1
is a result of Command
.
n
n
is met. Command Inhibit or NOP commands should be issued on any clock edges
XSR
period.
XSR
[57.58.59.60.61.62.]
.
CAS#
WE#
X
X
COMMAND INHIBIT (NOP/Continue previous operation)
H
H
NO OPERATION (NOP/Continue previous operation)
H
H
ACTIVE (Select and activate row)
L
H
AUTO REFRESH
L
L
LOAD MODE REGISTER
H
L
PRECHARGE
is HIGH (see Table 9. ) and after t
has been met (if the previous state was self refresh).
n
XSR
has been met. Row Active: A row in the bank has been activated, and t
RP
is met. Once t
RP
is met. Once t
is met, the bank will be in the row active state. Read w/Auto Precharge Enabled:
RCD
RCD
has been met. Once t
RP
is met. Once t
RC
has been met. Once t
MRD
is met. Once t
RP
FMS1616LAx-xxEx
Command
Action
n
n
X
Maintain Power Down
X
Maintain Self Refresh
X
Maintain Clock Suspend
Exit Power Down
Exit Self Refresh
X
Exit Clock Suspend
Power Down Entry
Auto Refresh
Self Refresh Entry
Valid
Clock Suspend Entry
See Table 10.
is met)
CKS
Command(Action)
[63.]
[63.]
[67.]
has been met. No data
RCD
is met, the bank will be in the idle state. Row Activating:
RP
is met, the bank will be in the idle state. Write w/Auto
RP
has been met. Once t
is met, the bank will be in the idle
RP
RP
is met, the SDRAM will be in the all banks idle state. Accessing
RC
is met, the SDRAM will be in the all banks idle
MRD
is met, all banks will be in the idle state.
RP

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