NT5CC64M16DP-BE View Datasheet(PDF) - Nanya Technology
Part Name
Description
MFG CO.
'NT5CC64M16DP-BE' PDF : 138 Pages View PDF
NT5CB128M8DN/NT5CB64M16DP
NT5CC128M8DN/NT5CC64M16DP
1Gb DDR3 D-die SDRAM
Power-Down Modes
Power-Down Entry and Exit
Power-Down is synchronously entered when CKE is registered low (along with NOP or Deselect command). CKE is not
allowed to go low while mode register set command, MPR operations, ZQCAL operations, DLL locking or read/write
operation are in progress. CKE is allowed to go low while any of other operation such as row activation, precharge or auto
precharge and refresh are in progress, but power-down IDD spec will not be applied until finishing those operation.
The DLL should be in a locked state when power-down is entered for fastest power-down exit timing. If the DLL is not
locked during power-down entry, the DLL must be reset after exiting power-down mode for proper read operation and
synchronous ODT operation. DRAM design provides all AC and DC timing and voltage specification as well proper DLL
operation with any CKE intensive operations as long as DRAM controller complies with DRAM specifications.
During Power-Down, if all banks are closed after any in progress commands are completed, the device will be in precharge
Power-Down mode; if any bank is open after in progress commands are completed, the device will be in active
Power-Down mode.
Entering Power-down deactivates the input and output buffers, excluding CK, CK, ODT, , and
. To protect
DRAM internal delay on CKE line to block the input signals, multiple NOP or Deselect commands are needed during the
CKE switch off and cycle(s) after, this timing period are defined as tCPDED. CKE_low will result in deactivation of
command and address receivers after tCPDED has expired.
Table 19: Power-Down Entry Definitions
Status of DRAM
MRS bit A12 DLL PD Exit
Relevant Parameters
Active
Don't Care
On
(A Bank or more open)
Fast
tXP to any valid command.
tXP to any valid command. Since it is in precharge state, commands
Precharged
here will be ACT, AR, MRS/EMRS, PR, or PRA.
0
Off
Slow
(All Banks Precharged)
tXPDLL to commands who need DLL to operate, such as RD, RDA,
or ODT control line.
Precharged
1
On
Fast
tXP to any valid command.
(All Banks Precharged)
Also the DLL is disabled upon entering precharge power-down (Slow Exit Mode), but the DLL is kept enabled during
precharge power-down (Fast Exit Mode) or active power-down. In power-down mode, CKE low,
high, and a stable
clock signal must be maintained at the inputs of the DDR3/L SDRAM, and ODT should be in a valid state but all other input
signals are “Don’t care” (If
goes low during Power-Down, the DRAM will be out of PD mode and into reset state).
CKE low must be maintain until tCKE has been satisfied. Power-down duration is limited by 9 times tREFI of the device.
REV 1.2
May. 2011
CONSUMER DRAM
© NANYA TECHNOLOGY CORP.
All rights reserved
NANYA TECHNOLOGY CORP. reserves the right to change Products and Specifications without notice.
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