Maxtor 546106, 51536H2, 52049H3 Pin Description Table, PIN Name Signal Name Signal Desc Ription

AT INTERFACE DESCRIPTION

Pin Description Table

PIN NAME	PIN	I/O	SIGNAL NAME	SIGNAL DESC RIPTION
RESET -	01	I	Hos t Reset	Reset signal from the host s ystem. Active during power up and inactive after.
D D0	17	I/O	Host Data Bus	16 bit bi-directional data bus between host and drive. Lower 8 bits used for
				register and EC C byte transfers. All 16 bits us ed for data transfers.
D D1	15	I/O
D D2	13	I/O
D D3	11	I/O
D D4	09	I/O
D D5	07	I/O
D D6	05	I/O
D D7	03	I/O
D D8	04	I/O
D D9	06	I/O
DD 10	08	I/O
D D11	10	I/O
DD 12	12	I/O
DD 13	14	I/O
DD 14	16	I/O
DD 15	18	I/O
D MARQ	21	O	DM A Request	This signal is used with DM AC K for D MA transfers . By asserting this s ignal, the
				drive indicates that data is ready to be transfered to and from the host.
DIOW -	23	I	Host I/O Write	Rising edge of Write strobe clock s data from the hos t data bus to a register on
STOP				the drive.
D IOR -	25	I	Host I/O Read	Read strobe enables data from a register on the drive onto the host data bus.
HD MARDY				DMA ready during UltraDMA data in bursts.
-				Data strobe during UltraDMA data out bursts.
HSTROBE
IORDY	27	O	I/O C hannel Ready	This signal may be driven low by the drive to insert wait states into host I/O
DD MARDY				cycles.
-				D MA ready during UltraDMA data out bursts.
DSTROBE				D ata strobe during UltraDMA data in bursts.
CSEL	28		C able Select	Us ed for Mas ter/Slave selection via cable. Requires s pecial cabling on host
				s ystem and installation of C able Select jumper.
D MACK -	29	I	D MA Acknowledge	This signal is used with DM ARQ for D MA transfers . By asserting this s ignal, the
				host is ac knowledging the receipt of data or is indicating that data is available.
INTRQ	31	O	Hos t Interrupt	Interrupt to the host asserted when the drive requires attention from the host.
			Request
IOC S16	32		D evice 16 bit I/O	Obsolete
PD IAG -	34	I/O	Pas sed D iagnostic	Output by drive when in Slave mode; Input to drive when in Master mode.
DA0	35	I	Hos t Address Bus	3 bit binary address from the host to selec t a regis ter in the drive.
DA1	33	I
DA2	36	I
C S0 -	37	I	Host Chip Select 0	C hip selec t from the host used to access the C omm and Block registers in the
				drive. This signal is a decode of I/O addres ses 1F0 - 1F 7 hex.
C S1 -	38	I	Host Chip Select 1	Chip select from the host used to access the Control registers in the drive. This
				signal is a decode of I/O addres ses 3F6 - 3F 7 hex.
DASP -	39	I/O	Drive Active/D rive	Time-multiplexed, open collector output which indicates that a drive is active, or
			1 Present	that
				device 1 is pres ent.
GND	02	N/A	Ground	Signal ground.
	19
	22
	24
	26
	30
	40
KEY	20	N/A	Key	Pin used for keying the interface connector.

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