pinouts

Accelerated Graphics Port (AGP)

pinout (распиновка)

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AGP [Accelerated Graphics Port] is a Point-to-Point [Chip-to-Chip] bus using 1.5 Volt or 3.3V signaling. The main use of the AGP bus is as a Local Video bus in IBM compatible Personal Computers [PCs]

разъем 132 pin EDGE (AGP bus)
132 pin EDGE (AGP bus) connector  at the computer motherboard

The Accelerated Graphics Port (also called Advanced Graphics Port) is a high-speed point-to-point channel for attaching a single device (generally a graphics card) to a computer"s motherboard, primarily to assist in the acceleration of 3D computer graphics. Many classify AGP as a type of computer bus, but this is something of a misnomer since buses generally allow multiple devices to be connected, while AGP does not. Some motherboards have been built with multiple independent AGP slots.

AGP dynamically allocates the PC"s normal RAM to store the screen image and to support some features. RAM used in this manner is referred to as the AGP Aperture. AGP originated from Intel, and it was first built into a chipset for the Pentium II microprocessor in 1997. AGP cards generally slightly exceed PCI cards in length and can be recognized by a typical "hook" at the inner end of the connector, which does not exist on PCI cards.

AGP versions includes:

  • AGP 1x (AGP 1.0), uses a 32-bit channel operating at 66 MHz with 1.5 V or 3.3 V signaling. This results in a maximum data rate for an AGP 1x slot of 266 megabytes per second. In comparison, a standard 32-bit 33 MHz PCI bus (which can be composed of one or more slots) is limited to 133 MB/s.
  • AGP 2x, using a 32-bit channel operating at 66 MHz double pumped to an effective 133 MHz resulting in a maximum data rate of 533 megabytes per second; signaling voltages the same as AGP 1x;
  • AGP 4x, using a 32-bit channel operating at 133 MHz double pumped to an effective 266 MHz resulting in a maximum data rate of 1066 megabytes per second; 1.5 V signaling;
  • AGP 8x, double pumped at 266 MHz to give a maximum of 2133 megabytes per second; 0.8 V signaling.
  • In addition, AGP Pro cards of various types exist. They require more power and are often longer than standard AGP card (though they only connect to one AGP slot). These cards are usually used to accelerate the professional computer-aided design applications employed in the fields of architecture, machining, engineering, and similar fields.

    Pin Name
    A1 +12 V dc
    A2 spare
    A3 Reserved* Ground
    A4 USB-
    A5 Ground
    A6 INTA#
    A7 RST#
    A8 GNT#
    A9 VCC 3.3
    A10 ST1
    A11 Reserved
    A12 PIPE#
    A13 Ground
    A14 Spare
    A15 SBA1
    A16 VCC 3.3
    A17 SBA3
    A18 Reserved
    A19 Ground
    A20 SBA5
    A21 SBA7
    A22 Key
    A23 Key
    A24 Key
    A25 Key
    A26 AD30
    A27 AD28
    A28 VCC 3.3
    A29 AD26
    A30 AD24
    A31 Ground
    A32 Reserved
    A33 C/BE3#
    A34 Vddq 3.3
    A35 AD22
    A36 AD20
    A37 Ground
    A38 AD18
    A39 AD16
    A40 Vddq 3.3
    A41 FRAME#
    A42 Spare
    A43 Ground
    A44 Spare
    A45 VCC 3.3
    A46 TRDY#
    A47 STOP#
    A48 Spare
    A49 Ground
    A50 PAR
    A51 AD15
    A52 Vddq 3.3
    A53 AD13
    A54 AD11
    A55 Ground
    A56 AD9
    A57 C/BE0#
    A58 Vddq 3.3
    A59 Reserved
    A60 AD6
    A61 Ground
    A62 AD4
    A63 AD2
    A64 Vddq 3.3
    A65 AD0
    A66 SMB1
    B1 spare
    B2 +5 V dc
    B3 +5 V dc
    B4 USB+
    B5 Ground
    B6 INTB#
    B7 CLK
    B8 REQ#
    B9 VCC 3.3
    B10 ST0
    B11 ST2
    B12 RBF#
    B13 Ground
    B14 Spare
    B15 SBA0
    B16 VCC 3.3
    B17 SBA2
    B18 SB_STB
    B19 Ground
    B20 SBA4
    B21 SBA6
    B22 Key
    B23 Key
    B24 Key
    B25 Key
    B26 AD31
    B27 AD29
    B28 VCC 3.3
    B29 AD27
    B30 AD25
    B31 Ground
    B32 AD STB1
    B33 AD23
    B34 Vddq 3.3
    B35 AD21
    B36 AD19
    B37 Ground
    B38 AD17
    B39 C/BE2#
    B40 Vddq 3.3
    B41 IRDY#
    B42 Spare
    B43 Ground
    B44 Spare
    B45 VCC 3.3
    B46 DEVSEL#
    B47 Vddq 3.3
    B48 PERR#
    B49 Ground
    B50 SERR#
    B51 C/BE1#
    B52 Vddq 3.3
    B53 AD14
    B54 AD12
    B55 Ground
    B56 AD10
    B57 AD8
    B58 Vddq 3.3
    B59 AD STB0
    B60 AD7
    B61 Ground
    B62 AD5
    B63 AD3
    B64 Vddq 3.3
    B65 AD1
    B66 SMB0

    The AGP bus is 32 bits wide, just the same as PCI is, but instead of running at half of the system (memory) bus speed the way PCI does, it runs at full bus speed. This means that on a standard Pentium II motherboard AGP runs at 66 MHz instead of the PCI bus"s 33 MHz. This of course immediately doubles the bandwidth of the port; instead of the limit of 127.2 MB/s as with PCI, AGP in its lowest speed mode has a bandwidth of 254.3 MB/s. The AGP specification is in fact based on the PCI 2.1 specification, which includes a high-bandwidth 66 MHz speed that was never implemented on the PC.

    This reserved pin should be connected to Ground

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    Pinouts.ru > Распиновки слотов расширения на материнской плате >  Распиновка Accelerated Graphics Port (AGP) использующего разъем 132 pin EDGE (AGP bus)

    Источник(и): http://en.wikipedia.org/wiki/Accelerated_Graphics_Port and others, from Hardware Book
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