Silicon Image SiliconDrive SSD-DXXX(I)-4210 - Manual (Page 17)

E LECTRICAL S PECIFICATION SSD-D XXX (I)-4210 D ATA S HEET
S ILICON S YSTEMS P ROPRIETARY
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4210D-03DSR P AGE 8 F EBRUARY 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.
Table 8: Signal Descriptions (Continued)
Signal Name Pin(s) Type Description