Datasheet, Volume 1 53

Power Management

4.3.2 DRAM Power Management and Initialization

The processor implements extensive support for power management on the SDRAM

interface. There are four SDRAM operations associated with the Clock Enable (CKE)

signals that the SDRAM controller supports. The processor drives four CKE pins to

perform these operations.

The CKE is one of the power-save means. When CKE is off the internal DDR clock is

disabled and the DDR power is reduced. The power-saving differs according the

selected mode and the DDR type used. For more information, please refer to the IDD

table in the DDR specification.

The DDR specification defines 3 levels of power-down that differ in power-saving and in

wakeup time:

1. Active power-down (APD): This mode is entered if there are open pages when

de-asserting CKE. In this mode the open pages are retained. Power-saving in this

mode is the lowest. Power consumption of DDR is defined by IDD3P. Exiting this

mode is fined by tXP – small number of cycles.

2. Precharged power-down (PPD): This mode is entered if all banks in DDR are

precharged when de-asserting CKE. Power-saving in this mode is intermediate –

better than APD, but less than DLL-off. Power consumption is defined by IDD2P1.

Exiting this mode is defined by tXP. Difference from APD mode is that when waking-

up all page-buffers are empty

3. DLL-off: In this mode the data-in DLLs on DDR are off. Power-saving in this mode

is the best among all power-modes. Power consumption is defined by IDD2P1.

Exiting this mode is defined by tXP, but also tXPDLL (10 – 20 according to DDR

type) cycles until first data transfer is allowed.

The processor supports 5 different types of power-down. The different modes are the

power-down modes supported by DDR3 and combinations of these. The type of CKE

power-down is defined by the configuration. The are options are:

1. No power-down

2. APD: The rank enters power-down as soon as idle-timer expires, no matter what is

the bank status

3. PPD: When idle timer expires the MC sends PRE-all to rank and then enters power-

down

4. DLL-off: same as option (2) but DDR is configured to DLL-off

5. APD, change to PPD (APD-PPD): Begins as option (1), and when all page-close

timers of the rank are expired, it wakes the rank, issues PRE-all, and returns to PPD

APD, change to DLL-off (APD_DLLoff) – Begins as option (1), and when all page-

close timers of the rank are expired, it wakes the rank, issues PRE-all and returns

to DLL-off power-down

The CKE is determined per rank when it is inactive. Each rank has an idle-counter. The

idle-counter starts counting as soon as the rank has no accesses, and if it expires, the

rank may enter power-down while no new transactions to the rank arrive to queues.

The idle-counter begins counting at the last incoming transaction arrival.

It is important to understand that since the power-down decision is per rank, the MC

can find many opportunities to power-down ranks even while running memory

intensive applications, and savings are significant (may be a few watts, according to

the DDR specification). This is significant when each channel is populated with more

ranks.

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 111 112

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Liebert Precision Cooling System DS Instrukcja Użytkownika (136 strony)

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User Manual

TABLE OF CONTENTS

SAVE THESE INSTRUCTIONS

2.0 COOLING CONFIGURATIONS

3.1 Room Preparation

Pre-Installation Guidelines

3.5 Operating Conditions

35"

33"

Dry Weight - lb. (kg)

Approximate

DPN000924

TOP VIEW

FRONT VIEW

DPN001013

24"

Supply air

26"

Top of Unit

DPN001196

SAFETY INFORMATION

Spreader Bars and Slings

Piano Jacks

Forklift

5.2.3 Removing Piano Jacks

DETAIL A

6.1 Required Equipment

6.3 Reassembly—Downflow Units

6.4 Reassembly Checklist

60-3/16"

(1529mm)

59-7/16"

(1509mm)

37"

6.5 Disassembly—Upflow Units

6.6 Reassembly—Upflow Unit

6.7 Reassembly Checklist

31-1/4"

45-13/16"

(1163mm)

7.0 ELECTRICAL CONNECTIONS

Electrical Connections

8.0 PIPING

INCORRECT

INCORRECTINCORRECT

General Guidelines

8.2 Refrigeration Piping

Fan Speed Control Piping

Fan Speed Charging

Lee-Temp Piping

Lee-Temp Charging

9.0 PIPING SCHEMATICS

For systems with drycoolers

CUSTOMER

HEAT REJECTION

LIEBERT DS UNIT

(and associated piping)

Piping Schematics

100

FRONT OF UNIT

101

Front View

101

Section A-A

101

DPN000803

101

Front of Unit

102

DPN000804

102

DPN000900

103

DPN000928

104

DPN000929

105

DPN000933

106

DPN001014

107

DPN001015

108

15-3/16"

109

FRONT SECTION VIEW

110

DPN001119

110

15-7/8"

111

FRONT SECTION VIEW OF UNIT

112

(Left Front Panel Not Shown)

112

TOP VIEW OF UNIT

112

Top View

113

Left Side Section View

113

Front Section View

113

FRONT SECTION VIEW OF UNIT

115

Front Of Unit

116

DPN001258

116

10.2 Electrical

117

10.3 Piping

117

10.4 Other

117

WARNING

118

12.0 MAINTENANCE

121

12.2 Blower Drive System

122

12.2.1 Upflow Motor Access

123

12.2.2 Belt Removal

123

Maintenance

124

Correct Switch Orientation

125

Incorrect Switch Orientation

125

DPN000996

125

12.4.1 Condensate Drain

126

12.4.2 Condensate Pump

126

12.7 Compressor

127

12.8 Compressor Replacement

128

12.10.1 Cleaning Instructions

129

12.11.3Drycooler Settings

131

AINTENANCE CHECKLIST

132

HVAC Maintenance Checklist

133

Glycol Pump

134

SL-18825_REV07_05-08

136

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