PC2700 INFINEON [Infineon Technologies AG], PC2700 Datasheet - Page 44

• Manufacturer Part Number: PC2700
• Description: 184 - Pin Registered Double Data Rate SDRAM Modules
• Manufacturer: INFINEON [Infineon Technologies AG]

6
Power Up and Power Management on DDR Registered DIMMs (according to JEDEC ballot JC-42.5 Item
1173)
184-pin Double Data Rate (DDR) Registered DIMMs include two new features to facilitate controlled power-up and
to minimize power consumption during low power mode. One feature is externally controlled via a system-
generated RESET signal; the second is based on module detection of the input clocks. These enhancements
permit the modules to power up with SDRAM outputs in a High-Z state (eliminating risk of high current dissipations
and/or dotted I/Os), and result in the powering-down of module support devices (registers and Phase-Locked
Loop) when the memory is in Self-Refresh mode.
The new RESET pin controls power dissipation on the module’s registers and ensures that CKE and other SDRAM
inputs are maintained at a valid ‘low’ level during power-up and self refresh. When RESET is at a low level, all the
register outputs are forced to a low level, and all differential register input receivers are powered down, resulting
in very low register power consumption. The RESET pin, located on DIMM tab #10, is driven from the system as
an asynchronous signal according to the attached details. Using this function also permits the system and DIMM
clocks to be stopped during memory Self Refresh operation, while ensuring that the SDRAMs stay in Self Refresh
mode.
Table 16
As described in the table above, a low on the RESET input ensures that the Clock Enable (CKE) signal(s) are
maintained low at the SDRAM pins (CKE being one of the 'Q' signals at the register output). Holding CKE low
maintains a high impedance state on the SDRAM DQ, DQS and DM outputs — where they will remain until
activated by a valid ‘read’ cycle. CKE low also maintains SDRAMs in Self Refresh mode when applicable.
The DDR PLL devices automatically detect clock activity above 20MHz. When an input clock frequency of 20MHz
or greater is detected, the PLL begins operation and initiates clock frequency lock (the minimum operating
frequency at which all specifications will be met is 95MHz). If the clock input frequency drops below 20MHz (actual
detect frequency will vary by vendor), the PLL VCO (Voltage Controlled Oscillator) is stopped, outputs are made
High-Z, and the differential inputs are powered down — resulting in a total PLL current consumption of less than
1mA. Use of this low power PLL function makes the use of the PLL RESET (or G pin) unnecessary, and it is tied
inactive on the DIMM.
This application note describes the required and optional system sequences associated with the DDR Registered
DIMM 'RESET' function. It is important to note that all references to CKE refer to both CKE0 and CKE1 for a 2-
bank DIMM. Because RESET applies to all DIMM register devices, it is therefore not possible to uniquely control
CKE to one physical DIMM bank through the use of the RESET pin.
Data Sheet
RESET
X: Don’t care, Hi-Z: High Impedance, Qo: Data latched at the previous of CK rising and CK falling
H
H
H
H
L
Application Note
RESET Truth Table
X or Hi-Z
High Z
Rising
Rising
L or H
CK
Register Inputs
X or Hi-Z
Registered Double Data Rate SDRAM Modules
Falling
Falling
High Z
L or H
CK
44
HYS72D[32/64/128]3[00/20]GBR
Data in (D)
X or Hi-Z
H
X
X
L
10102003-01E2-HPA8
Application Note
Rev. 1.1, 2004-04
Data out (Q)
Illegal input
conditions
Register
Outputs
Qo
H
L
L