USB2005-MV-01 Standard Microsystems (SMSC), USB2005-MV-01 Datasheet - Page 11

• Manufacturer Part Number: USB2005-MV-01
• Manufacturer: Standard Microsystems (SMSC)

Specifications of USB2005-MV-01

• Operating Temperature (min): 0C
• Operating Temperature Classification: Commercial
• Operating Temperature (max): 70C
• Rad Hardened: No
• Lead Free Status / Rohs Status: Compliant

USB 2.0 ATA/ATAPI Controller with PD-DRM
Datasheet
SMSC USB2005
Termination Resistor
Full Speed USB
Data
Memory Data Bus
Memory Address
Bus
Memory Write Strobe
Memory Read
Strobe
IO Read Strobe
IO Write Strobe
Crystal
Input/External Clock
Input
Crystal Output
Clock Output
Internal ROM Enable
RTERM
FS-
FS+
MD[7:0]
MA[15:0]
nMWR
nMRD
nIOR
nIOW
XTAL1/
CLKIN
XTAL2
CLKOUT
ROMEN
Table 5.1 USB2005 Pin Descriptions (continued)
MEMORY/IO INTERFACE
IO-U
IO12PU
ICLKx
O8
IP
O12
O12
O12
O12
O12
OCLKx
DATASHEET
MISC
11
A precision 1.5Kohm precision resistor is
attached to this pin from a 3.3V supply.
These pins connect to the USB- and USB+
pins through 31.6 ohm series resistors.
When ROMEN=0, these signals are used to
transfer data between the internal CPU and the
external program memory. When ROMEN=1, a
weak internal pull up is activated to prevent
these pins from floating.
These signals address memory locations within
the external memory.
Program Memory Write; active low
Program Memory Read; active low
XDATA space Read; active low
XDATA space Write; active low
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. It may not be used to
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.
When left unconnected or tied high, the
USB97C202 uses the internal ROM for
program execution. When tied low, an external
program memory should be connected to the
memory/data bus. The state of this pin latched
internally on the rising edge of nRESET.
Revision 0.2 (01-16-07)