FIC A360 service manual B.9 FDD Connector, B.10 HDD Pin Assignment, Pin Assignments

Pin Assignments

B.9 FDD Connector

The pin assignment for the FDD connector is as follows:

NO.	Signal	Description	Type
24	RDATA#	Read disk data. Raw serial bit stream form the disk drive, low active.	I
		Each falling edge represents a flux transition of the encoded data.
		Write gate. This active low high current driver allows current to flow
18	WGATE#	through the write head .	O
		It becomes active just prior to writing to the diskette.
		Write data. This active low high current driver provides the encoded
16	WDATA#	data to the disk drive.	O
		Each falling edge causes a flux transition on the media.
		Head select. The high current select the floppy disk side for reading or
26	HDSEL#	writing. A logic “1” on the pin means side 0 will be accessed, while a	O
		logic “0” means side 1 will be accessed.
		Direction control. This high current low active output determines the
12	DIR#	direction of the head movement. A logic “1” on this pin means outward	O
		motion , while a logic “0” means inward motion.
14	STEP#	Step pulse. The active low high current driver issues a low pules for	O
		each track-to-track movement of the head.
		Disk change. This input senses that the drive door is open or that the
		diskette has possibly been changed since the last drive selection.
6	DSKCHG#	This input is inverted and read via bit 7 of I/O address 3F7H. The	I
		DSKCHG# bit also depends upon the state of the Force Disk Change
		bits in the Force FDD Status Change configuration register.
4	DS0#	Drive select 0. Active low outputs select drives 0.	O
10	MOTR0	Motor on. These active low output motor on.	O
13	3MODE	3 Mode FDD select.	O
22	WRTPRT#	Write protected. This active low Schmitt trigger input senses from the	I
		disk drive that a disk is write protected.
20	TRK0#	Track 00. This active low Schmitt trigger input senses from the disk	I
		drive that the head is positioned over the outermost track.
		This active low Schmitt Trigger input senses from the disk drive that
2	INDEX#	head is positioned over the beginning of a track , as marked by an	I
		index hole.
7,8,9	NC
25,23,21,	Gnd	Ground	I
19,17,15
11,5,3,1	+5Vs	+5V power supply	O

B.10 HDD Pin Assignment

The pin assignment of the internal HDD is as follows:

NO.	Signal	Description	Type
1	HDDRESET#	Reset primary disk	O
35	RPDA0	Primary disk address 0	O
33	RPDA1	Primary disk address 1	O
36	RPDA2	Primary disk address 2	O
17	RPDD0	Primary disk data 0	I/O
15	RPDD1	Primary disk data 1	I/O
13	RPDD2	Primary disk data 2	I/O
11	RPDD3	Primary disk data 3	I/O
9	RPDD4	Primary disk data 4	I/O
7	RPDD5	Primary disk data 5	I/O
5	RPDD6	Primary disk data 6	I/O
3	RPDD7	Primary disk data 7	I/O

B-6 FIC A550 Service Manual