Seagate ST39173FC manual FC-SCA pin descriptions

Barracuda 9LP FC Installation Guide, Rev. A					25
Table 1:		FC-SCA pin descriptions
	Pin/contact		Signal name	Signal type
1*		–EN bypass port A	TTL output
	2*		12 Volts
3*			12 Volts
	4*		12 Volts
5*			–Parallel ESI
	6*		Ground[1]
7*			Active LED out	Open collector out
	8*		Reserved
9*			Start_1	TTL input
	10*		Start_2	TTL input
11*			–EN bypass port B	TTL output
	12*		SEL_6	TTL input/output
13*			SEL_5	TTL input/output
	14*		SEL_4	TTL input/output
15*			SEL_3	TTL input/output
	16*		Fault LED out	Open collector out
17*			Reserved NC
	18*		Reserved NC
19*			5 Volts
	20*		5 Volts
21			12 Volts charge
	22		Ground
23			Ground
	24*		+Port A_in	Diff. PECL input pair
25*			–Port A_in