Intel NETWORK PROCESSOR IXP2800 Manual do Utilizador Página 48

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48 Hardware Reference Manual
Intel
®
IXP2800 Network Processor
Technical Description
An algorithm for debug software to find out the contents of the CAM is shown in Example 12.
The CAM can be cleared with CAM_Clear instruction. This instruction writes 0x00000000
simultaneously to all entries tag, clears all the state bits, and puts the LRU into an initial state
(where entry 0 is LRU, ..., entry 15 is MRU).
2.3.8 CRC Unit
The CRC Unit operates in parallel with the Execution Datapath. It takes two operands, performs a
CRC operation, and writes back a result. CRC-CCITT, CRC-32, CRC-10, CRC-5, and iSCSI
polynomials are supported. One of the operands is the CRC_Remainder Local CSR, and the other
is a GPR, Transfer_In register, Next Neighbor, or Local Memory, specified in the instruction and
passed through the Execution Datapath to the CRC Unit.
The instruction specifies the CRC operation type, whether to swap bytes and or bits, and which
bytes of the operand to include in the operation. The result of the CRC operation is written back
into CRC_Remainder. The source operand can also be written into a destination register (however
the byte/bit swapping and masking do not affect the destination register; they only affect the CRC
computation). This allows moving data, for example, from S_TRANSFER_IN registers to
S_TRANSFER_OUT registers at the same time as computing the CRC.
Example 12. Algorithm for Debug Software to Find out the Contents of the CAM
; First read each of the tag entries. Note that these reads
; don’t modify the LRU list or any other CAM state.
tag[0] = CAM_Read_Tag(entry_0);
......
tag[15] = CAM_Read_Tag(entry_15);
; Now read each of the state bits
state[0] = CAM_Read_State(entry_0);
...
state[15] = CAM_Read_State(entry_15);
; Knowing what tags are in the CAM makes it possible to
; create a value that is not in any tag, and will therefore
; miss on a lookup.
; Next loop through a sequence of 16 lookups, each of which will
; miss, to obtain the LRU values of the CAM.
for (i = 0; i < 16; i++)
BEGIN_LOOP
; Do a lookup with a tag not present in the CAM. On a
; miss, the LRU entry will be returned. Since this lookup
; missed the LRU state is not modified.
LRU[i] = CAM_Lookup(some_tag_not_in_cam);
; Now do a lookup using the tag of the LRU entry. This
; lookup will hit, which makes that entry MRU.
; This is necessary to allow the next lookup miss to
; see the next LRU entry.
junk = CAM_Lookup(tag[LRU[i]]);
END_LOOP
; Because all entries were hit in the same order as they were
; LRU, the LRU list is now back to where it started before the
; loop executed.
; LRU[0] through LRU[15] holds the LRU list.
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Liebert Precision Cooling System DS podręczniki

Instrukcje obsługi i podręczniki użytkownika dla Sprzęt komputerowy Liebert Precision Cooling System DS.
Dostarczamy 1 pdf podręczników Liebert Precision Cooling System DS do pobrania za darmo według typów dokumentów: Instrukcja Użytkownika


Spis treści

User Manual

1

2

TABLE OF CONTENTS

3

SAVE THESE INSTRUCTIONS

11

2.0 COOLING CONFIGURATIONS

16

3.1 Room Preparation

17

Pre-Installation Guidelines

18

3.5 Operating Conditions

19

35"

22

33"

22

Dry Weight - lb. (kg)

23

Approximate

23

DPN000924

24

TOP VIEW

26

FRONT VIEW

26

DPN001013

28

24"

33

Supply air

37

26"

39

Top of Unit

40

DPN001196

43

SAFETY INFORMATION

45

Spreader Bars and Slings

46

Piano Jacks

46

Forklift

46

5.2.3 Removing Piano Jacks

48

DETAIL A

51

6.1 Required Equipment

52

6.3 Reassembly—Downflow Units

55

6.4 Reassembly Checklist

56

60-3/16"

57

(1529mm)

57

59-7/16"

60

(1509mm)

60

37"

61

6.5 Disassembly—Upflow Units

66

6.6 Reassembly—Upflow Unit

68

6.7 Reassembly Checklist

68

31-1/4"

69

45-13/16"

71

(1163mm)

71

7.0 ELECTRICAL CONNECTIONS

78

Electrical Connections

80

8.0 PIPING

82

INCORRECT

83

INCORRECTINCORRECT

83

General Guidelines

84

8.2 Refrigeration Piping

85

Fan Speed Control Piping

88

Fan Speed Charging

89

Lee-Temp Piping

90

Lee-Temp Charging

91

9.0 PIPING SCHEMATICS

92

For systems with drycoolers

94

CUSTOMER

95

HEAT REJECTION

95

LIEBERT DS UNIT

96

(and associated piping)

96

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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