Seagate ST19101FC manual SEL2

Cheetah 9FC Installation Guide, Rev. A				25
	Pin/contact	Signal name	Signal type
	26	Ground
27*		+Port B_in	Diff. PECL input pair
	28*	–Port B_in
29		Ground
	30*	+Port A_out	Diff. PECL output pair
31*		–Port A_out
	32	Ground
33*		+Port B_out	Diff. PECL output pair
	34*	–Port B_out
35		Ground
	36	SEL_2	TTL input
37		SEL_1	TTL input
	38	SEL_0	TTL input
39		Reserved NC
	40	5 Volts charge