AGP总线接口定义
AGP总线：
为图形加速端口直接跟北桥相连，让图形处理器与系统的主内存直接相连增加传输速率，在显存不足的情况下可以直接调用主内存，分别达到AGP 1X 266MB/S、AGP 2X 533MB/S、AGP 4X 1066MB/S、AGP 8X 2132MB/S，AGP总有132脚，AD线有32条，在维修时可以理解为高速的PCI总线。
A2 4脚为RST B2 4脚为CLK AD 线有32条 VCC=3 .3V, VDD=1.5V
AGP底视图
|
Pin |
A1 |
R |
A2 |
R |
B1 |
R |
B2 |
R |
|
1 |
TYFEDT# |
|
12v |
|
5V |
|
OVRCNT# |
|
|
2 |
|
GO-AGP8X |
|
USB+ |
|
5V |
| |
|
3 |
INTI# |
|
GND |
|
INTB# |
|
GND |
|
|
4 |
GNT |
|
RST# |
|
REQ |
|
CLK |
|
|
5 |
ST1 |
|
VCC3.3 |
|
ST0 |
|
VCC3.3 |
|
|
6 |
RESERVED |
|
MB-AGP8X |
|
RBF |
|
ST2 |
|
|
7 |
WBF |
|
GND |
|
RESERVED |
|
GND |
|
|
8 |
VCC3.3 |
|
SBA1# |
|
VCC3.3 |
|
SBA0# |
|
|
9 |
SB-STBS |
|
SBA3# |
|
SB-STBF |
|
SBA2# |
|
|
10 |
SBA5 |
|
GND |
|
SBA4# |
|
GND |
|
|
11 |
|
|
SBA7# |
|
|
|
SBA6# |
|
|
12 |
|
|
|
|
|
|
|
|
|
13 |
AD30 |
|
|
|
AD31 |
|
|
|
|
14 |
VCC3.3 |
|
AD28 |
|
VCC3.3 |
|
AD29 |
|
|
15 |
AD24 |
|
AD26 |
|
AD25 |
|
AD27 |
|
|
16 |
AD-STBS1 |
|
GND |
|
AD-STF1 |
|
GND |
|
|
17 |
VDDQ1.5 |
|
BE3 |
|
VDDQ1.5 |
|
AD23 |
|
|
18 |
AD20 |
|
AD22 |
|
AD19 |
|
AD21 |
|
|
19 |
AD18 |
|
GND |
|
AD17 |
|
GND |
|
|
20 |
VDDQ1.5 |
|
AD16 |
|
VDDQ1.5 |
|
C#/BE2 |
|
|
21 |
KEY |
|
FRAME# |
|
KEY |
|
IRDY# |
|
|
22 |
KEY |
|
KEY |
|
KEY |
|
KEY |
|
|
23 |
TRDY# |
|
KEY |
|
DEVSEL# |
|
KEY |
|
|
24 |
PME# |
|
STOP# |
|
PERR# |
|
VDDQ1.5 |
|
|
25 |
PAR |
|
GND |
|
SERR |
|
GND |
|
|
26 |
VDDQ1.5 |
|
AD15 |
|
VDDQ1.5 |
|
C#/BE1 |
|
|
27 |
AD11 |
|
AD13 |
|
AD12 |
|
AD14 |
|
|
28 |
AD9 |
|
GND |
|
AD10 |
|
GND |
|
|
29 |
BDDQ1.5 |
|
BEO |
|
VDDQ1.5 |
|
AD8 |
|
|
30 |
AD6 |
|
AD-STBSO |
|
AD7 |
|
AD\STBFO |
|
|
31 |
AD4 |
|
GND |
|
AD5 |
|
GND |
|
|
32 |
VDD1.5 |
|
AD2 |
|
VDDQ1.5 |
|
AD3 |
|
|
33 |
AGPvrefgc |
|
AD0 |
|
AGPvrefgc |
|
AD1 |
|