8.Системная шина. Назначение и составные части:
1. Первичная (фсб)
2. Вторичная (бсб)
Компьютерная шина (от англ. computer bus) — в архитектуре компьютера подсистема, которая передаёт данные между функциональными блоками компьютера. В связи с этим разделяется механический, электрический (физический) и логический (управляющий) уровни.В отличие от связи точка-точка, обычно к шине можно подключить несколько устройств по одному набору проводников. Каждая шина определяет свой набор коннекторов (соединений) для физического подключения устройств, карт и кабелей.Компьютерные шины ранних вычислительных машин представляли собой жгуты (пучки соединительных проводов — сигнальных и питания, для компактности и удобства обслуживания увязанных вместе) реализующие параллельные электрические шины с несколькими подключениями. В современных вычислительных системах данный термин используется для любых физических механизмов, предоставляющих такую же логическую функциональность, как параллельные компьютерные шины.
9.Шины расширения. Рисунок слота с нумерацией контактов. Таблица назначения контактов шин расширения.
Шина расширения — компьютерная шина, которая используется на системной карте компьютеров или промышленных контроллеров, для добавления устройств (плат) в компьютер.
Контакты A 32 бит |
Контакты A 64 бит |
Контакты В 32 бит |
Контакты В 64 бит |
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PCI-E
Pin |
Side B Connector |
Side A Connector |
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# |
Name |
Description |
Name |
Description |
1 |
+12v |
+12 volt power |
PRSNT#1 |
Hot plug presence detect |
2 |
+12v |
+12 volt power |
+12v |
+12 volt power |
3 |
RSVD |
Reserved |
+12v |
+12 volt power |
4 |
GND |
Ground |
GND |
Ground |
5 |
SMCLK |
SMBus clock |
JTAG2 |
TCK |
6 |
SMDAT |
SMBus data |
JTAG3 |
TDI |
7 |
GND |
Ground |
JTAG4 |
TDO |
8 |
+3.3v |
+3.3 volt power |
JTAG5 |
TMS |
9 |
JTAG1 |
+TRST# |
+3.3v |
+3.3 volt power |
10 |
3.3Vaux |
3.3v volt power |
+3.3v |
+3.3 volt power |
11 |
WAKE# |
Link Reactivation |
PWRGD |
Power Good |
Mechanical Key |
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12 |
RSVD |
Reserved |
GND |
Ground |
13 |
GND |
Ground |
REFCLK+ |
Reference Clock Differential pair |
14 |
HSOp(0) |
Transmitter Lane 0, Differential pair |
REFCLK- |
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15 |
HSOn(0) |
GND |
Ground |
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16 |
GND |
Ground |
HSIp(0) |
Receiver Lane 0, Differential pair |
17 |
PRSNT#2 |
Hotplug detect |
HSIn(0) |
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18 |
GND |
Ground |
GND |
Ground |
PCI-Express 4x Connector Pin-Out
Pin |
Side A Connector |
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# |
Description |
Name |
Description |
|
1 |
+12 volt power |
PRSNT#1 |
Hot plug presence detect |
|
2 |
+12 volt power |
+12v |
+12 volt power |
|
3 |
Reserved |
+12v |
+12 volt power |
|
4 |
Ground |
GND |
Ground |
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5 |
SMBus clock |
JTAG2 |
TCK |
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6 |
SMBus data |
JTAG3 |
TDI |
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7 |
Ground |
JTAG4 |
TDO |
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8 |
+3.3 volt power |
JTAG5 |
TMS |
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9 |
+TRST# |
+3.3v |
+3.3 volt power |
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10 |
3.3v volt power |
+3.3v |
+3.3 volt power |
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11 |
Link Reactivation |
PWRGD |
Power Good |
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12 |
Reserved |
GND |
Ground |
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13 |
Ground |
REFCLK+ |
Reference Clock Differential pair |
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14 |
Transmitter Lane 0, Differential pair |
REFCLK- |
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15 |
GND |
Ground |
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16 |
Ground |
HSIp(0) |
Receiver Lane 0, Differential pair |
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17 |
Hotplug detect |
HSIn(0) |
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18 |
Ground |
GND |
Ground |
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19 |
Transmitter Lane 1, Differential pair |
RSVD |
Reserved |
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20 |
GND |
Ground |
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21 |
Ground |
HSIp(1) |
Receiver Lane 1, Differential pair |
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22 |
Ground |
HSIn(1) |
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23 |
Transmitter Lane 2, Differential pair |
GND |
Ground |
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24 |
GND |
Ground |
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25 |
Ground |
HSIp(2) |
Receiver Lane 2, Differential pair |
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26 |
Ground |
HSIn(2) |
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27 |
Transmitter Lane 3, Differential pair |
GND |
Ground |
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28 |
GND |
Ground |
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29 |
Ground |
HSIp(3) |
Receiver Lane 3, Differential pair |
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PCI-Express 8x Connector Pin-Out
Pin |
Side B Connector |
Side A Connector |
||
# |
Name |
Description |
Name |
Description |
1 |
+12v |
+12 volt power |
PRSNT#1 |
Hot plug presence detect |
2 |
+12v |
+12 volt power |
+12v |
+12 volt power |
3 |
RSVD |
Reserved |
+12v |
+12 volt power |
4 |
GND |
Ground |
GND |
Ground |
5 |
SMCLK |
SMBus clock |
JTAG2 |
TCK |
6 |
SMDAT |
SMBus data |
JTAG3 |
TDI |
7 |
GND |
Ground |
JTAG4 |
TDO |
8 |
+3.3v |
+3.3 volt power |
JTAG5 |
TMS |
9 |
JTAG1 |
+TRST# |
+3.3v |
+3.3 volt power |
10 |
3.3Vaux |
3.3v volt power |
+3.3v |
+3.3 volt power |
11 |
WAKE# |
Link Reactivation |
PWRGD |
Power Good |
Mechanical Key |
||||
12 |
RSVD |
Reserved |
GND |
Ground |
13 |
GND |
Ground |
REFCLK+ |
Reference Clock Differential pair |
14 |
HSOp(0) |
Transmitter Lane 0, Differential pair |
REFCLK- |
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15 |
HSOn(0) |
GND |
Ground |
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16 |
GND |
Ground |
HSIp(0) |
Receiver Lane 0, Differential pair |
17 |
PRSNT#2 |
Hotplug detect |
HSIn(0) |
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18 |
GND |
Ground |
GND |
Ground |
19 |
HSOp(1) |
Transmitter Lane 1, Differential pair |
RSVD |
Reserved |
20 |
HSOn(1) |
GND |
Ground |
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21 |
GND |
Ground |
HSIp(1) |
Receiver Lane 1, Differential pair |
22 |
GND |
Ground |
HSIn(1) |
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23 |
HSOp(2) |
Transmitter Lane 2, Differential pair |
GND |
Ground |
24 |
HSOn(2) |
GND |
Ground |
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25 |
GND |
Ground |
HSIp(2) |
Receiver Lane 2, Differential pair |
26 |
GND |
Ground |
HSIn(2) |
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27 |
HSOp(3) |
Transmitter Lane 3, Differential pair |
GND |
Ground |
28 |
HSOn(3) |
GND |
Ground |
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29 |
GND |
Ground |
HSIp(3) |
Receiver Lane 3, Differential pair |
30 |
RSVD |
Reserved |
HSIn(3) |
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31 |
PRSNT#2 |
Hot plug detect |
GND |
Ground |
PCI-Express 16x Connector Pin-Out
Pin |
Side B Connector |
Side A Connector |
||
# |
Name |
Description |
Name |
Description |
1 |
+12v |
+12 volt power |
PRSNT#1 |
Hot plug presence detect |
2 |
+12v |
+12 volt power |
+12v |
+12 volt power |
3 |
RSVD |
Reserved |
+12v |
+12 volt power |
4 |
GND |
Ground |
GND |
Ground |
5 |
SMCLK |
SMBus clock |
JTAG2 |
TCK |
6 |
SMDAT |
SMBus data |
JTAG3 |
TDI |
7 |
GND |
Ground |
JTAG4 |
TDO |
8 |
+3.3v |
+3.3 volt power |
JTAG5 |
TMS |
9 |
JTAG1 |
+TRST# |
+3.3v |
+3.3 volt power |
10 |
3.3Vaux |
3.3v volt power |
+3.3v |
+3.3 volt power |
11 |
WAKE# |
Link Reactivation |
PWRGD |
Power Good |
Mechanical Key |
||||
12 |
RSVD |
Reserved |
GND |
Ground |
13 |
GND |
Ground |
REFCLK+ |
Reference Clock Differential pair |
14 |
HSOp(0) |
Transmitter Lane 0, Differential pair |
REFCLK- |
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15 |
HSOn(0) |
GND |
Ground |
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16 |
GND |
Ground |
HSIp(0) |
Receiver Lane 0, Differential pair |
17 |
PRSNT#2 |
Hotplug detect |
HSIn(0) |
|
18 |
GND |
Ground |
GND |
Ground |
19 |
HSOp(1) |
Transmitter Lane 1, Differential pair |
RSVD |
Reserved |
20 |
HSOn(1) |
GND |
Ground |
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21 |
GND |
Ground |
HSIp(1) |
Receiver Lane 1, Differential pair |
22 |
GND |
Ground |
HSIn(1) |
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23 |
HSOp(2) |
Transmitter Lane 2, Differential pair |
GND |
Ground |
24 |
HSOn(2) |
GND |
Ground |
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25 |
GND |
Ground |
HSIp(2) |
Receiver Lane 2, Differential pair |
26 |
GND |
Ground |
HSIn(2) |
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27 |
HSOp(3) |
Transmitter Lane 3, Differential pair |
GND |
Ground |
28 |
HSOn(3) |
GND |
Ground |
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29 |
GND |
Ground |
HSIp(3) |
Receiver Lane 3, Differential pair |
30 |
RSVD |
Reserved |
HSIn(3) |
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31 |
PRSNT#2 |
Hot plug detect |
GND |
Ground |
