Шина AGP

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Распайка шины AGP [Accelerated Graphics Port]

132 pin EDGE (AGP bus) Accelerated Graphics Port (AGP) connector разъем

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

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

The AGP bus is based on the PCI [Peripheral Component Interface] spec, using the PCI specification as an operational baseline. The AGP specification adds 20 additional signals not included in the PCI bus. The AGP specification defines the Protocol, Electrical and Mechanical aspects of the bus.

The Mechanical definitions include a connector and Add-in card. The Card sizes and 1.5v and 3.3v connectors are also defined with in the spec. There are five connectors defined: AGP 3.3v, AGP 1.5v, AGP Universal, AGP Pro Universal, AGP Pro 3.3v, and AGP Pro 1.5v. PCI and AGP boards are not mechanically interchangeable.

The AGP 1.0 specification defined 1x and 2x speeds with the 3.3v keyed connector.
The AGP 2.0 specification defined 1x, 2x and 4x speeds with the 3.3v, or 1.5v keyed connector or a "Universal" connector which supported both card types.
The AGP Pro specification defined 1x, 2x and 4x speeds with the 3.3v, or 1.5v keyed connector or a "Universal" connector which supported both card types.
The AGP 3.0 specification defined 1x, 2x, 4x and 8x speeds with the 1.5v keyed connector or a 1.5v AGP Pro connector.
Each up-grade is a supper-set of the 1x mode, so 4x will also support 1x. The base clock rate is 66MHz, but to achieve to 2x, 4x, and 8x speeds the clock is doubled each time. AGP uses both edges of the clock to transfer data.

AGP (1x): 66MHz clock, 8 bytes/clock, Bandwidth: 266MB/s [3.3V or 1.5V signal swing]
AGP 2x: 133MHz clock, 8 bytes/clock, Bandwidth: 533MB/s [3.3V or 1.5V signal swing]
AGP 4x: 266MHz clock, 16 bytes/clock, Bandwidth: 1066MB/s [1.5V signal swing]
AGP 8x: 533MHz clock, 32 bytes/clock, Bandwidth: 2.1GB/s [0.8V signal swing]

The AGP data bus may be 8, 16, 24, 32, or 64 bits. Due to timing requirements the maximum bus length is 9". The trace impedance is specified as 65 ohms +/- 15 ohms (no termination resistor is specified). For the 8x speed the bus

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Дата изменения: 20.06.2016