Silicon Image SSD-H16G(I)-3500 manual DMA Request. This signal is used for DMA, Register access

ELECTRICAL SPECIFICATION				SSD-HXXX(I)-3500 DATA SHEET
		Table 9:	Signal Descriptions (Continued)
	Signal Name	Pin(s)	Type	Description
	DMARQ	21	O	DMA Request. This signal is used for DMA
				transfers between the host and device.
				DMARQ is asserted by the device when the
				device is ready to transfer data to/from the
				host. The direction of data transfer is
				controller by -IORD and -IOWR. This signal
				is used in a handshake manner with
				-DMACK (i.e., the device waits until the
				host asserts -DMACK before negating
				DMARQ, and reasserts DMARQ if there is
				more data to transfer). The DMARQ/
				-DMACK handshake is used to provide flow
				control during the transfer.
	GND	2, 19, 22,	-	Ground. The device ground signal.
		24, 26,
		30, 40,
		43
	INTRQ	31	O	Interrupt Request. This signal is an active
				high interrupt request to the host.
	IORDY	27	I	I/O Channel Ready. The signal is negated
				to extend the host transfer cycle of any host
				register access.
	-IORD	25	I	Device I/O Read. This is the read strobe
				signal from the host. The falling edge of
				IORD enables data from the device onto
				the data bus. The rising edge of IORD
				latches data at the host. The host does not
				act on the data until it is latched.
	-IOWR	23	I	Device I/O Write. This is the write strobe
				signal from the host. The rising edge of
				IOWR# latches data from the data bit
				signals. The device does not act on the
				data until it is latched.
	KEY	20	-	Key. Reserved for the Connector Key.
	-PDIAG	34	I/O	Pass Diagnostic. This open drain signal is
				asserted by the slave to indicate to the
				master that it has passed its diagnostics.

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3500H-03DSR PAGE 8 FEBRUARY 2, 2009