x300 pci pinout

	A	B	C	D	E	F	G	H	I	J
1	Pin			pad	Side B	Side A	pad		Comments
2	1	components side			−12 V	TRST#			JTAG port pins (optional)
3	2				TCK	=+12 V
4	3		1	G	Ground	TMS
5	4		2	x	TDO	TDI	x
6	5				=+5 V	=+5 V
7	6				=+5 V	INTA#	x		Interrupt lines (open-drain)
8	7				INTB#	INTC#
9	8				INTD#	=+5 V
10	9				PRSNT1#	Reserved			Pulled low to indicate 7.5 or 25 W power required
11	10				Reserved	IOPWR			+5 V or +3.3 V
12	11				PRSNT2#	Reserved			Pulled low to indicate 7.5 or 15 W power required
13	12			--	Ground	Ground			Key notch for 3.3 V-capable cards
14	13			--	Ground	Ground
15	14				Reserved	3.3 V aux			Standby power (optional)
16	15				Ground	RST#	x		Bus reset
17	16	CLK0		x	CLK	IOPWR			33/66 MHz clock
18	17			G	Ground	GNT#	x		Bus grant from motherboard to card
19	18			x	REQ#	Ground	G		Bus request from card to motherboard
20	19				IOPWR	PME#			Power management event (optional) 3.3 V, open drain, active low.[17]
21	20		41	x	AD[31]	AD[30]	x		Address/data bus (upper half)
22	21		42	x	AD[29]	=+3.3 V
23	22				Ground	AD[28]	x	43
24	23		44	x	AD[27]	AD[26]	x	45
25	24		46	x	AD[25]	Ground	G
26	25				=+3.3 V	AD[24]	x
27	26		49?	x	C/BE[3]#	IDSEL	x
28	27		50?	x	AD[23]	=+3.3 V
29	28				Ground	AD[22]	x
30	29			x	AD[21]	AD[20]	x
31	30			x	AD[19]	Ground	G
32	31				=+3.3 V	AD[18]	x
33	32		60	x	AD[17]	AD[16]	x
34	33			x	C/BE[2]#	=+3.3 V
35	34				Ground	FRAME#	x		Bus transfer in progress
36	35			x	IRDY#	Ground	G		Initiator ready
37	36	1.5V LDO U8		V	=+3.3 V	TRDY#	x		Target ready
38	37			x	DEVSEL#	Ground	G		Target selected
39	38			G	Ground	STOP#	x		Target requests halt
40	39				LOCK#	=+3.3 V	V		Locked transaction
41	40				PERR#	SMBCLK			SDONE	Parity error; SMBus clock or Snoop done (obsolete)
42	41			V	=+3.3 V	SMBDAT			SBO#	SMBus data or Snoop backoff (obsolete)
43	42				SERR#	Ground	G		System error
44	43			V	=+3.3 V	PAR	x		Even parity over AD[31:00] and C/BE[3:0]#
45	44		p49	x	C/BE[1]#	AD[15]	x		Address/data bus (lower half)
46	45			x	AD[14]	=+3.3 V	V
47	46				Ground	AD[13]	x
48	47			x	AD[12]	AD[11]	x
49	48			x	AD[10]	Ground	G
50	49			x	M66EN	AD[09]	x		AD[09]
51	50			--	Ground	Ground	-		Key notch for 5 V-capable cards
52	51			-	Ground	Ground	-
53	52			x	AD[08]	C/BE[0]#	x		Address/data bus (lower half)
54	53			x	AD[07]	=+3.3 V
55	54				=+3.3 V	AD[06]	x
56	55			x	AD[05]	AD[04]	x
57	56			x	AD[03]	Ground	G
58	57				Ground	AD[02]	x
59	58			x	AD[01]	AD[00]	x
60	59				IOPWR	IOPWR
61	60				ACK64#	REQ64#			For 64-bit extension; no connect for 32-bit devices.
62	61			V	=+5 V	=+5 V	V
63	62			V	=+5 V	=+5 V	V
64
65				25			26
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