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Hodnocené. / 5. Na základě hodnocení zákazníků
Intel
®
E8870 Scalable Node Controller (SNC) Datasheet 5-5
Memory Subsystem
The operating system guarantees that only one of these addresses will be generated by a processor.
No conflict will be detected between a processor write to the legitimate address and a scrub write to
the alias. Therefore, the scrub engine must not generate writes to the aliases. Use of reflections are
limited to recovering memory behind MMIOL to allow scrub hardware to identify these aliases.
Then there are only two cases of aliases, addresses in the range MMIOL.BASE - 4 GB, and the
complementary range in any MIRs used for the upper reflection. To avoid these aliases, the scrub
engine will not generate writes to these two address ranges:
(A[43:32] = 000h) AND (FFh >= A[31:24] > MMIOL.BASE)
MIT.RFLCT AND (A[31:24] <= MMIOL.BASE)
The MIT.RFLCT bit will be set for any MIR used for MMIOL reflection. The top of the reflection
is restricted to end on a 4-GB boundary so to eliminate addresses in the reflected range which may
or may not be aliases. The reflection of the range from MMIOL.BASE to 4 GB is scrubbed, but no
other addresses in the reflected MIR.
5.2.2 Correction for System Accesses
Correctable errors found in normal read traffic will be corrected and forwarded to the processor bus
or SP, but not written back to memory. Any error remains in memory until they are scrubbed. One
data buffer will be reserved for the scrub engine, so that it does not need to perform data buffer
allocation.
Data from memory normally does not flow through correction logic. If the SNC encounters an
error, data flow will switch to a “correction pipe” with longer latencies. The SNC will continue to
deliver data with a longer latency until a break in traffic allows data flow to be returned to the
normal pipe.
5.2.3 Software Scrubs
Since read errors are not corrected immediately, one memory error may result in frequent
correctable error interrupts. To reduce the possibility of a second failure producing an un-
correctable error, and to avoid performance loss until the scrub engine reaches the error, software
scrub is recommended.
5.2.4 Memory Error Correction Code
The code layout is illustrated in Figure 5-1 and Figure 5-2. Each packet on the four SNC main
channels is split into two codewords. The first codeword appears in transfers 0-3, and the second in
transfers 4-7. The codeword spans the four SNC main channels, consisting of 32-bytes of data
covered by 32 checkbits. An SNC fetch of 128-bytes will be four codewords.
The figures show the position of each data bit (D[255:0]) of the 32-bytes of data and the 32
checkbits (C[31:0]) in each codeword. The least significant 32-bytes of the 64-byte access is
transferred first.
Each code word consists of 32 symbols, eight on each of the four main channels. The division of
bits into symbols is the same on each channel, but checkbits are assigned to different symbols on
different channels. On each main channel, symbols a, b, c, d, e, and f are 8-bit symbols, while g and
h are 12-bit. One symbol in each codeword can be corrected. Errors in more than one symbol are
not correctable. More than 99.9999% of errors confined to two symbols are guaranteed detected.
- (SNC) Datasheet 1
- Contents 3
- Introduction 1 11
- Introduction 12
- Figure 1-1. Typical Itanium 12
- 2-Based Server Configuration 12
- 1.3 Architectural Overview 13
- 1.4 Interfaces 14
- 1.4.5 JTAG Interface 15
- 1.5 Terminology 16
- 1.6 References 18
- 1.7 Revision History 18
- Signal Description 2 19
- 2.2 SNC Signal List 20
- Signal Description 21
- Configuration Registers 3 31
- 3.2.3 BOFLA: Boot Flag Alias 32
- 3.3 SNC I/O Space Registers 33
- 3.5 PCI Standard Registers 34
- Configuration Registers 35
- 3.6 Address Mapping Registers 37
- 3-8 Intel 38
- • A[43:26] == BASE 40
- : 5C - 5Fh 41
- 3-12 Intel 42
- 3-14 Intel 44
- 3-18 Intel 48
- Table 3-6. DDR IOP Decodes 51
- 3-22 Intel 52
- 3.8.1 SYRE: System Reset 53
- 3-24 Intel 54
- 44h (Continued) 55
- 3.8.4 SPAD: Scratch Pad 56
- 3.8.6 BOFL: Boot Flag 57
- 3.9 Error Registers 63
- 3.9.4 ERRMASK: ERRST MASK 68
- Processor Bus 69
- : 40h(31:0), 44h(63:32) 71
- : 48h(31:0), 4Ch(63:32) 71
- 3-42 Intel 72
- : E0h(31:0), E4h(63:32) 73
- 3-44 Intel 74
- 3.10.2 PTCTL: Timer Control 76
- 3-48 Intel 78
- Response 79
- Events LO 82
- Events HI 83
- Resource Events 84
- : E8h (SPPMD0), F8h (SPPMD1) 87
- : E4h (SPPMC0), F4h (SPPMC1) 87
- 3-60 Intel 90
- 3.10.18 HPDATA: Hot Page Data 93
- 3-64 Intel 94
- System Address Map 4 97
- 4.1.1 Compatibility Region 98
- 4.1.1.1 DOS Region 98
- 4.1.1.2 VGA Memory Range 98
- 4.1.1.3 MDA Memory Range 98
- 4.1.1.4 C and D Segments 98
- 4.1.2 System Region 99
- 4.1.2.1 Local Firmware Range 99
- 4-4 Intel 100
- System Address Map 102
- Local Firmware Disabled 102
- 4.1.5 Main Memory Region 104
- 4.1.5.3.3 Node Interleaving 105
- 4.1.5.3.4 Limitations 105
- 4-10 Intel 106
- 4.2.1.2 SPS Registers 108
- 4.2.1.1 SNC Registers 108
- 4.2.1.3 SIOH Registers 109
- 4-14 Intel 110
- Table 4-7. Intel 112
- 4.3 I/O Address Map 114
- 4.3.2 Outbound I/O Access 115
- 4.3.2.1 Outbound I/Os 115
- 4.4 Configuration Space 116
- 4.5 Illegal Addresses 117
- Memory Subsystem 5 119
- 5.1.2 Reads 120
- 5.1.3 Writes 121
- 5.2 Error Correction 122
- 5.2.3 Software Scrubs 123
- Memory Subsystem 124
- 5.2.5.1 FRU Isolation 126
- 5.2.6 Memory Test 126
- 5.3 DDR Organization 127
- 5.3.2 DDR Features Supported 128
- 5-12 Intel 130
- 5.3.3 Power Management 132
- Serviceability 6 135
- Table 6-1. Intel 136
- E8870 Chipset Errors 136
- • Memory: 139
- • Configuration Registers: 139
- 6.1.2 Data Poisoning 140
- 6.1.3 Error Reporting 140
- 6.1.4 Interface Details 141
- 6.1.5 Time-Out 142
- Responsibilities 143
- 6.2.2 Server Management (SM) 144
- 6.2.3 OS/System Software 144
- 6.2.4 Device Driver 144
- 6.3 Availability 145
- 6.4 Hot-Plug 146
- 6.5 Chipset Error Record 147
- 6-14 Intel 148
- • Non-continuable (NC) 149
- • Continuable Single (CS) 149
- • Continuable Trailing (CT) 149
- 6-16 Intel 150
- 6-18 Intel 152
- 6.5.4 ESP Error Logs 154
- 6-22 Intel 156
- Clocking 7 157
- Clocking 158
- 7-4 Intel 160
- 7.8 JTAG 161
- 7.9 SMBus Clocking 161
- 7.11 Analog Power Supply Pins 161
- System Reset 8 163
- 8.2 Reset Sequences 164
- 8.2.1 Power-up Reset Sequence 165
- System Reset 166
- 8.2.1.1 PWRGOOD Deassertion 167
- 8-6 Intel 168
- 8.2.2 Hard Reset 169
- 8-8 Intel 170
- Incomplete 171
- Initialization 171
- Complete Initialization 171
- 50 System Clocks 171
- 8-10 Intel 172
- 8.2.2.7 Local Resets 173
- 8.3 Reset Signals 174
- 8.3.1 ICH4: PWROK 175
- 8.3.3 SIOH: DET 175
- 8.3.4 ICH4: PCIRST# 175
- 8-16 Intel 178
- Electrical Specifications 9 179
- 9.3.1 Overview 180
- 9.3.2 Signal Group 181
- 9.3.3 DC Specifications 182
- 9.5 Main Channel Interface 183
- 9.5.2 DC Specifications 184
- 9.5.3 AC Specifications 184
- 9.6 LPC Signal Group 185
- 9.7.1 DC Specifications 186
- 9.7.2 AC Specifications 187
- 9.7.3 AC Timing Waveforms 188
- 9.8.1 Signal Groups 189
- 9.8.2 DC Characteristics 190
- 9.8.3 AC Specification 191
- Electrical Specifications 192
- 9.9 Clock Signal Groups 193
- 9-16 Intel 194
- 10-2 Intel 196
- 10.2 Ball-out Specifications 197
- Table 10-1. SNC Ball List 198
- 10-6 Intel 200
- 10-8 Intel 202
- 10-10 Intel 204
- 10-12 Intel 206
- 10-14 Intel 208
- 10-16 Intel 210
- 10-18 Intel 212
- 10-20 Intel 214
- 10-22 Intel 216
- 10-24 Intel 218
- 10-26 Intel 220
- 10-28 Intel 222
- 10-30 Intel 224
- 10-32 Intel 226
- 10-34 Intel 228
- 10-36 Intel 230
- 10-38 Intel 232
- Testability 11 233
- 11.2 Public TAP Instructions 236
- 11.4 TAP registers 237
- 11-6 Intel 238
- Testability 239
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