Hitachi HTS541640J9SA00, HTS541680J9SA00 manual Signal definitions, 7.3.1 TX+ / TX, 7.3.2 RX+ / RX

Travelstar 5K160 (SATA) Hard Disk Drive Specification

7.3Signal definitions

The pin assignments of interface signals are listed as follows:

	No.		Plug Connector pin definition	Signal	I/O
	S1	GND	2nd mate	Gnd
	S2	A+	Differential signal A from Phy	RX+	Input
	S3	A-		RX-	Input
Signal	S4	Gnd	2nd mate	Gnd
	S5	B-	Differential signal B from Phy	TX-	Output
	S6	B+		TX+	Output
	S7	Gnd	2nd mate	Gnd
			Key and spacing separate signal and power
			segments
	P1	V33	3.3V power	3.3V
	P2	V33	3.3V power	3.3V
	P3	V33	3.3V power, pre-charge, 2nd Mate	3.3V
	P4	Gnd	1st mate	Gnd
	P5	Gnd	2nd mate	Gnd
	P6	Gnd	2nd mate	Gnd
	P7	V5	5V power,pre-charge,2nd Mate	5V
	P8	V5	5V power	5V
Power	P9	V5	5V power	5V
	P10	Gnd	2nd mate	Gnd
	P11	DAS/DSS	Device Activity Signal / Disable Staggered	Note 1
			Spinup1
	P12	Gnd	1st mate	Gnd
	P13	V12	12V power,pre-chage,2nd mate	V12
	P14	V12	12V power	V12
	P15	V12	12V power	V12

Table 23. Interface connector pins and I/O signals

Note 1;

Pin P11 is used by the drive to provide the host with an activity indication and by the host to indicate whether staggered spinup should be used.

The signal the drive provides for activity indication is a low-voltage low-current driver.

If pin P11 is asserted low the drive shall disable staggered spin-up and immediately initiate spin-up. If pin P11 is not connected in the host (floating), the drive shall enable staggered spin-up.

7.3.1TX+ / TX-

These signal are the outbound high-speed differential signals that are connected to the serial ATA cable

7.3.2RX+ / RX-

These signals are the inbound high-speed differential signals that are connected to the serial ATA cable.

The following standard shall be referenced about signal specifications.

Serial ATA: High Speed Serialized AT Attachment Revision 1.0a 7-January -2003

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