Datasheet

CKEn-1 CKEn CURRENT STATE COMMANDn ACTIONn NOTES
L L Power Down X Maintain Power Down
L L Self Refresh X Maintain Self Refresh
L L Deep Power Down X Maintain Deep Power Down
L H Power Down NOP or DESELECT Exit Power Down 5, 6, 9
L H Self Refresh NOP or DESELECT Exit Self Refresh 5, 7, 10
L H Deep Power Down NOP or DESELECT Exit Deep Power Down 5, 8
H L All Banks Idle NOP or DESELECT Precharge Power Down Entry 5
H L Bank(s) Active NOP or DESELECT Active Power Down Entry 5
H L All Banks Idle AUTO REFRESH Self Refresh Entry
H L All Banks Idle BURST TERMINATE Enter Deep Power Down
H H See the other Truth Tables
Notes:
Table 7 – Truth Table - CKE [Notes 1 - 10]
1. CKEn is the logic state of CKE at clock edge n; CKEn-1 was the state of CKE at the previous clock edge.
2. Current state is the state of Mobile DDR SDRAM immediately prior to clock edge n.
3. COMMANDn is the command registered at clock edge n, and ACTIONn is the result of COMMANDn.
4. All states and sequences not shown are illegal or reserved.
5. DESELECT and NOP are functionally interchangeable.
6. Power Down exit time (tXP) should elapse before a command other than NOP or DESELECT is issued.
7. SELF REFRESH exit time (tXSR) should elapse before a command other than NOP or DESELECT is issued.
8. The Deep Power-Down exit procedure must be
followed as discussed in the Deep Power-Down section of the Functional
Description.
9. The clock must toggle at least once during the tXP period.
10. The clock must toggle at least once during the tXSR time.
Basic Timing Parameters for Commands
Figure.6 — Basic Timing Parameters
AS4C16M16MD1
256Mb MOBILE DDR SDRAM
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Ver.1.1 Oct.2015