Hitachi HUS157373EL3800 specifications 4 Pin assignment of SCSI Bus Connector C1 SCA-2, LVD mode

Table 11.4 Pin assignment of SCSI Bus Connector C1 (SCA-2, LVD mode)

Signal Name	Connector contact No.		Signal Name
12V	1	41	GND(12V Return)
12V	2	42	GND(12V Return)
12V	3	43	GND(12V Return)
12V	4	44	MATED1 (Note 2)
Open	5	45	Open
Open	6	46	DIFFSENS
-DB(11)	7	47	+DB(11)
-DB(10)	8	48	+DB(10)
-DB(9)	9	49	+DB(9)
-DB(8)	10	50	+DB(8)
-I/O	11	51	+I/O
-REQ	12	52	+REQ
-C/D	13	53	+C/D
-SEL	14	54	+SEL
-MSG	15	55	+MSG
-RST	16	56	+RST
-ACK	17	57	+ACK
-BSY	18	58	+BSY
-ATN	19	59	+ATN
-DB(P0)	20	60	+DB(P0)
-DB(7)	21	61	+DB(7)
-DB(6)	22	62	+DB(6)
-DB(5)	23	63	+DB(5)
-DB(4)	24	64	+DB(4)
-DB(3)	25	65	+DB(3)
-DB(2)	26	66	+DB(2)
-DB(1)	27	67	+DB(1)
-DB(0)	28	68	+DB(0)
-DB(P1)	29	69	+DB(P1)
-DB(15)	30	70	+DB(15)
-DB(14)	31	71	+DB(14)
-DB(13)	32	72	+DB(13)
-DB(12)	33	73	+DB(12)
5V	34	74	MATED2 (Note 2)
5V	35	75	GND(5V Return)
5V	36	76	GND(5V Return)
Reserved	37	77	LED(with 0 ohm)
AUTO START (Note 1)	38	78	-DELAY START (Note 1)
-ID0 (Note 1)	39	79	-ID1 (Note 1)
-ID2 (Note 1)	40	80	-ID3 (Note 1)

Note 1 When this signal is held to ground, it is regarded as LOW. When this signal is open, it is regarded as HIGH. It can be driven by open collector driver.

Do not pull up this signal.

Note 2 The MATED2 signal is tied to ground, and the MATED1 signal is pulled up to HIGH level in the drive. When the drive detects the MATED1 signal is held to LOW, the drive regards the connection has completed. When the drive detects the MATED1 signal is held to HIGH, it regards the connection is incomplete.

Drawing No. Sheet No. Revision 5
K6602906	36/46	2003/6/12