SPIF225A Sunplus, SPIF225A Datasheet - Page 12

• Manufacturer Part Number: SPIF225A
• Description: USB and eSTAT to Serial-ATA Bridge
• Manufacturer: Sunplus

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For full-speed device, it will raise pull up resistor at D+ to create
an IDLE-J situation. If the device is unplugged or want to create
software disconnect situation by take out pull up resistor, host will
detect D+D- is changing from IDLE-J to SE0 and recognize as
device unplugged.
6.2.2. SATA Hot-Plug Support
SATA use differential signal squelch level to detect if host/device is
present. Host will keep sending (can be disable to reduce power
consumption) OOB signal to let device detect its present. If a
device received host OOB signal, it will also return OOB signal to
let host detect its present and communication channel is
established.
6.2.3. SPIF225A Hot-Plug Support
SPIF216A can perform software USB disconnect function by
taking out 45ohm termination in high speed or taking out 1.5K pull
up resistor on DP in full speed. All SATA device connection status
will all reflect on USB site. For example, if SPIF216A is plugged
into USB host without SATA device connection. SPIF216 will
perform USB software disconnection and users will not see any
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absent
host
Device detect host method
absent
host
Device detect host method
VBUS rise
VBUS fall
RX differential signal show
OOB of comm reset
signal disappear
RX differential
present
host
present
host
Fig 6-2: SATA Hot Plug Mechanism
Fig 6-1: USB Hot Plug Mechanism
device
absent
12
D+ fall during idle
For high-speed device, host will keep sending SOF packet in idle
situation. Because both host and device has 45ohm pull down
termination resistor, the voltage level is normal. If device
unplugged or want to create software disconnect situation by take
out its pull down resistor, the voltage level is twice as normal
voltage because equivalent resistor is increased.
If any site is unplug or create a software disconnect situation by
stop it transmitter from sending differential signal, the other site
will sense the differential signal disappear and know the other site
is unplugged.
USB device plugged in information. If SATA device is plugged in
later, SPIF216 will restart its USB connection procedure and users
will see a new USB device plugged in. If SATA device is suddenly
unplugged,
disconnection to show users an USB device is unplugged
Periodically TX OOB comm reset signal
absent
device
until received comm init from RX
D+ rise
Host detect device method
Host detect device method
signal disappear
RX differential
SPIF216A
full speed
present
device
speed emulation pass
SOF voltage level too large
will
(termination resistor at
present
device
device disappear)
also
perform
high speed
present
device
SPIF225A
USB
Jan, 25, 2007
Version: 1.1
.
software