USB97C201-MN SMSC [SMSC Corporation], USB97C201-MN Datasheet - Page 12

• Manufacturer Part Number: USB97C201-MN
• Description: USB 2.0 ATA/ ATAPI Controller
• Manufacturer: SMSC [SMSC Corporation]

SMSC DS – USB97C201
Crystal
Input/External
Clock Input
Crystal
Output
Clock Output CLKOUT
General
Purpose I/O
RESET input nRESET
Test input
XTAL1/
CLKIN
XTAL2
GPIO[0:7]
nTest[0:2}
VDD
VDDIO
VDDP
VSSP
VDDA
VSSA
GND
NC
POWER, GROUNDS, and NO CONNECTS
PRELIMINARY
OCLKx
ICLKx
IO20
O8
IP
IS
Page 12
MISC
12Mhz Crystal or external clock input.
This pin can be connected to one terminal of
the crystal or can be connected to an external
12Mhz clock when a crystal is not used.
12Mhz Crystal
This is the other terminal of the crystal, or left
open when an external clock source is used to
drive XTAL1/CLKIN.
drive any external circuitry other than the
crystal circuit.
This pin produces a 30Mhz clock signal
independent of the processor clock divider. It
is held inactive and low whenever the internal
processor clock is stopped or is being
obtained from the ring oscillator.
These general purpose pins may be used
either as inputs, edge sensitive interrupt
inputs, or outputs. In addition, GPIO0 has the
capability of auto-toggling at a 1Hz rate when
used as an output.
reset the chip. The active low pulse should be
at least 100ns wide.
These signals are used for testing the chip.
User
unconnected. For board testing, all pads
except these test inputs are included in an
XNOR chain, such that by tying nTEST2 low,
nIOR will reflect the toggling of a signal on
each pin. Circuit board continuity of the pin
solder connections after assembly can be
checked in this manner
+2.5V Core power
+3.3V I/O power
+2.5 Analog power
Analog Ground Reference
+3.3V Analog power
Analog Ground Reference
Ground Reference
No Connect. These pins should not be
connected externally.
This active low signal is used by the system to
should
normally
It may not be used to
leave
them
Rev. 03/25/2002