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Internet Data Sheet
Rev. 1.21, 2006-08 35
03292006-6N25-8R3I
HYS72D[64/128/256]xxxHBR–[5/6]–C
Registered Double-Data-Rate SDRAM Module
Power-Up Sequence with RESET — Required
1. The system sets RESET at a valid low level. This is the preferred default state during power-up. This input condition forces
all register outputs to a low state independent of the condition on the register inputs (data and clock), ensuring that CKE is
at a stable low-level at the DDR SDRAMs.
2. The power supplies should be initialized according to the JEDEC-approved initialization sequence for DDR SDRAMs.
3. Stabilization of Clocks to the SDRAM The system must drive clocks to the application frequency (PLL operation is not
assured until the input clock reaches 20MHz). Stability of clocks at the SDRAMs will be affected by all applicable system
clock devices, and time must be allotted to permit all clock devices to settle. Once a stable clock is received at the DIMM
PLL, the required PLL stabilization time (assuming power to the DIMM is stable) is 100 microseconds. When a stable clock
is present at the SDRAM input (driven from the PLL), the DDR SDRAM requires 200 µsec prior to SDRAM operation.
4. The system applies valid logic levels to the data inputs of the register (address and controls at the DIMM connector). CKE
must be maintained low and all other inputs should be driven to a known state. In general these commands can be
determined by the system designer. One option is to apply an SDRAM ‘NOP’ command (with CKE low), as this is the first
command defined by the JEDEC initialization sequence (ideally this would be a ‘NOP Deselect’ command). A second option
is to apply low levels on all of the register inputs to be consistent with the state of the register outputs.
5. The system switches RESET to a logic ‘high’ level. The SDRAM is now functional and prepared to receive commands.
Since the RESET signal is asynchronous, setting the RESET timing in relation to a specific clock edge is not required
(during this period, register inputs must remain stable).
6. The system must maintain stable register inputs until normal register operation is attained. The registers have an activation
time that allows their clock receivers, data input receivers, and output drivers sufficient time to be turned on and become
stable. During this time the system must maintain the valid logic levels described in step 5. It is also a functional requirement
that the registers maintain a low state at the CKE outputs to guarantee that the DDR SDRAMs continue to receive a low
level on CKE. Register activation time (t (ACT) ), from asynchronous switching of RESET from low to high until the registers
are stable and ready to accept an input signal, is specified in the register and DIMM do-umentation.
7. The system can begin the JEDEC-defined DDR SDRAM power-up sequence (according to the JEDEC-pproved
initialization sequence).
Self Refresh Entry (RESET low, clocks powered off) — Optional
Self Refresh can be used to retain data in DDR SDRAM DIMMs even if the rest of the system is powered down and the clocks
are off. This mode allows the DDR SDRAMs on the DIMM to retain data without external clocking. Self Refresh mode is an
ideal time to utilize the RESET pin, as this can reduce register power consumption (RESET low deactivates register CK and
CK, data input receivers, and data output drivers).
• The system applies Self Refresh entry command. (CKEÆLow, CSÆLow, RAS Æ Low, CASÆ Low, WEÆ High)
Note: The commands reach the DDR SDRAM one clock later due to the additional register pipelining on a Registered DIMM.
After this command is issued to the SDRAM, all of the address and control and clock input conditions to the SDRAM are
Don’t Cares— with the exception of CKE.
• The system sets RESET at a valid low level. This input condition forces all register outputs to a low state, independent of
the condition on the registerm inputs (data and clock), and ensures that CKE, and all other control and address signals, are
a stable low-level at the DDR SDRAMs. Since the RESET signal is asynchronous, setting the RESET timing in relation to a
specific clock edge is not required.
• The system turns off clock inputs to the DIMM. (Optional) a. In order to reduce DIMM PLL current, the clock inputs to the
DIMM are turned off, resulting in High-Z clock inputs to both the SDRAMs and the registers. This must be done after the
RESET deactivate time of the register (t (INACT) ). The deactivate time defines the time in which the clocks and the control
and address signals must maintain valid levels after RESET low has been applied and is specified in the register and DIMM
documentation. b. The system may release DIMM address and control inputs to High-Z. This can be done after the RESET
deactivate time of the register. The deactivate time defines the time in which the clocks and the control and the address
signals must maintain valid levels after RESET low has been applied. It is highly recommended that CKE continue to remain
low during this operation.