USB2504 SMSC Corporation, USB2504 Datasheet - Page 13

• Manufacturer Part Number: USB2504
• Description: Integrated USB 2.0 Compatible 4-Port Hub
• Manufacturer: SMSC Corporation

Integrated USB 2.0 Compatible 4-Port Hub
Datasheet
SMSC USB2504/USB2504A
Serial Clock/SMB
Serial Data/SMB
Crystal Output
Input/External
CFG_SEL2
Programming
Programming
Programming
Clock Input
Clock Input
Configuration
Configuration
Configuration
Crystal
Enable
NAME
NAME
Select
Select
Select
Clock
X
X
X
0
1
Data
CFG_SEL1
SDA/SMBDATA
CLKIN_EN
SCL/SMBCLK
SYMBOL
CFG_SEL0
CFG_SEL1
CFG_SEL2
XTAL1/
CLKIN
XTAL2
0
0
1
1
1
SYMBOL
Table 4.1 4-Port Hub Pin Descriptions (continued)
Table 4.2 SMBus or EEPROM Interface Behavior
CFG_SEL0
0
1
0
0
1
IOSD12
IOSD12
IOSD12
Table 4.3 Miscellaneous Pins
OCLKx
SERIAL PORT INTERFACE
TYPE
ICLKx
TYPE
I
I
I
DATASHEET
SMBus or EEPROM interface behavior.
Configured as an SMBus slave for external download of user-
defined descriptors. SMBus slave address is 0101100
Configured as an SMBus slave for external download of user-
defined descriptors. SMBus slave address is 0101101
Internal Default Configuration
Internal Default Configuration via strapping options.
2-wire (I2C) EEPROMS are supported,
(Serial Data)/(SMB Data) signal.
(Serial Clock)/(SMB Clock) signal.
This multifunction pin is read on the rising edge of
RESET_N negation and will determine the hub
configuration method as described in
This pin is read on the rising edge of RESET_N (see the
applicable RESET_N timing table in
determine the hub configuration method as described in
Table
This pin is read on the rising edge of RESET_N negation
and will determine the hub configuration method as
described in
13
This pin connects to either one terminal of the crystal or
to an external 24MHz clock when a crystal is not used.
24MHz Crystal
This is the other terminal of the crystal, or left
unconnected when an external clock source is used to
drive XTAL1/CLKIN. It must not be used to drive any
external circuitry other than the crystal circuit.
Clock In Enable:
Low = XTAL1 and XTAL2 pins configured for use with
external crystal
High = XTAL1 pin configured as CLKIN, and must be
driven by an external CMOS clock.
24MHz crystal or external clock input.
4.2.
Table
4.2.
FUNCTION
FUNCTION
Section
Table
Revision 2.1 (12-06-06)
4.2.
5.6.1) and will