Silicon-image SiliconDrive SSD-H16G(I)-3500 User Manual download pdf (Page 17)

ELECTRICAL SPECIFICATION SSD-HXXX(I)-3500 DATA SHEET

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3500H-03DSR PAGE 8FEBRUARY 2, 2009

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,

24, 26,

30, 40,

- Ground. The device ground signal.

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

-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.

Table 9: Signal Descriptions (Continued)

Signal Name Pin(s) Type Description

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 75 76

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