construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC
reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications
before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent
rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently da ted
version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors
known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not
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The SMSC 7-Port Hub is fully compliant with the USB 2.0 Specification and will attach to a USB host
as a Full-Speed Hub or as a Full-/High-Speed Hub. The 7-Port Hub supports Low-Speed, Full-Speed,
and High-Speed (if operating as a High-Speed Hub) downstream devices on all of the enabled
downstream ports.
A dedicated Transaction Translator (TT) is available for each downstream facing port. This architecture
ensures maximum USB throughput for each connected device when operating with mixed-speed
peripherals.
Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
The Hub works with an external USB power distribution switch device to control V
downstream ports, and to limit current and sense over-current conditions.
All required resistors on the USB ports are integrated into the Hub. This includes all seri es termination
resistors on D+ and D– pins and all require d pull-down and pull-up resistors on D+ and D– pins. The
over-current sense inputs for the downstream facing ports have internal pull-up resistors.
Throughout this document the upstream facing port of the hub will be referred to as the upstream port,
and the downstream facing ports will be called the downstream ports.
1.1OEM Selectable Features
A default configuration is available in the USB2507 following a reset. This configuration may be
sufficient for some applications. Strapping option pins make it possible to modify a limited sub-set of
the configuration options.
The USB2507 may also be configured by an external EEPROM or a microcontroller. When using the
microcontroller interface, the Hub appears as an SMBus slave device. If the Hub is pin-strapped for
external EEPROM configuration but no external EEPROM is present, then a value of ‘0’ will be written
to all configuration data bit fields (the hub will attach to the ho st with all ‘0’ values).
The 7-Port Hub supports several OEM selectable features:
Operation as a Self-Powered USB Hub or as a Bus-Powered USB Hub.
Operation as a Dynamic-Powered Hub (Hub operate s as a Bus-Powered device if a local power
source is not available and switches to Self-Powered opera tion when a local power source is
available).
Optional OEM configuration via I2C EEPROM or via the industry standard SMBus interface from
an external SMBus Host.
LED indicator support.
Compound device support (port is permanently hardwired to a down strea m USB perip heral device).
Hardware strapping options enable configuration of the following feature s.
Non-Removable Ports
Port Power Polarity (active high or active low logic)
Port Disable
LED support
MTT enable
Ganged Vs Port power switching and over-current sensing
IO-UThese pins connect to the upstream USB bus data signals.
USBDP0
Detect Upstream
VBUS Power
VBUS_DETI/O12Detects state of Upstream VBUS power. The SMSC Hub
monitors VBUS_DET to determine when to assert the
internal D+ pull-up resistor (signalling a connect event).
When designing a detachable hub, this pin must be
connected to the VBUS power pin of the USB port that is
upstream of the hub. (Use of a weak pull-down resistor is
recommended.)
For self-powered applications with a permanently attached
host, this pin must be pulled-up to either 3.3V or 5.0V
(typically VDD33).
SMSC USB25079Revision 2.3 (08-27-07)
DATASHEET
Integrated USB 2.0 Compatible 7-Port Hub
Table 4.1 7-Port Hub Pin Descriptions (continued)
NAMESYMBOLTYPEFUNCTION
7-PORT USB 2.0 HUB INTERFACE
Datasheet
High-Speed USB
Data
USB Power
Enable
Ports [7:5] Green
LED
Port 4:3 Green
LED
&
Port Disable
strapping option.
USBDN[7:1]
USBDP[7:1]
IO-UThese pins connect to the downstream USB peripheral
devices attached to the Hub’s ports.
PRTPWR[7:1]O12Enables power to USB peripheral devices (downstream).
The active signal level of the PRTPWR7:1 pins is
determined by the Power Polarity Strapping function of the
PRTPWR_POL pin.
GR[7:5]I/O12Green indicator LED’s for ports[7:5]. LED is active low
GR[4:3]/
PRT_DIS[1:0]
I/O12Green indicator LED for ports 4 and 3. Will be active low
when LED support is enabled via EEPROM or SMBus.
If the hub is configured by the internal default configuration,
these pins will be sampled at RESET_N negation to
determine if ports [7:5] will be permanently disabled. Also,
the active state of the LED’s will be determined as follows:
PRT_DIS[1:0] = ‘00’, All ports are enabled,
GR4 is active high,
GR3 is active high.
PRT_DIS[1:0] = ‘01’, Port 7 is disabled,
GR4 is active high,
GR3 is active low.
PRT_DIS[1:0] = ‘10’, Ports 7 & 6 are disabled,
GR4 is active low,
GR3 is active high.
Port [2:1] Green
LED
&
Port Non-
Removable
strapping option.
Ports [7:5] Amber
LED
PRT_DIS[1:0] = ‘11’, Ports 7, 6 & 5 are disabled,
GR4 is active low,
GR3 is active low.
GR[2:1]/
NON_REM[1:0]
I/O12Green indicator LED for ports 2 and 1. Will be active low
when LED support is enabled via EEPROM or SMBus.
If the hub is configured by the internal default configuration,
these pins will be sampled at RESET_N negation to
determine if ports [3:1] contain permanently attached (nonremovable) devices. Also, the active state of the LED’s will
be determined as follows:
NON_REM[1:0] = ‘00’, All ports are removable,
GR2 is active high,
GR1 is active high.
NON_REM[1:0] = ‘01’, Port 1 is non-removable,
GR2 is active high,
GR1 is active low.
NON_REM[1:0] = ‘10’, Ports 1 & 2 are non-removable,
GR2 is active low,
GR1 is active high.
NON_REM[1:0] = ‘11’, Ports 1, 2, & 3 are non-removable,
GR2 is active low,
GR1 is active low.
AM[7:5]I/O12Amber indicator LED’s for ports [7:5], LED is active low.
Revision 2.3 (08-27-07)10SMSC USB2507
DATASHEET
Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
Table 4.1 7-Port Hub Pin Descriptions (continued)
NAMESYMBOLTYPEFUNCTION
Port 4 Amber
LED
&
LED Enable
strapping option
Port 3 Amber
LED
Port 2 Amber
LED
&
MTT Disable
Port 1 Amber
LED
&
Gang Power
Switching and
Current Sensing
strapping option.
AM4/
LED_EN
I/O12Amber indicator LED for port 4. Will be active low when LED
support is enabled via EEPROM or SMBus.
If the hub is configured by the internal default configuration,
this pin will be sampled at RESET_N negation to determine
if LED support is enabled or disabled. Also, the active state
of the LED will be determined as follows:
‘0’ = LED support is disabled, LED is inactive
‘1’ = LED Support is enabled, LED is active low.
AM3I/O12Amber indicator LED for port 3. Signal will be active low.
AM2/
MTT_EN
I/O12Amber indicator LED for port 2. Will be active low when LED
support is enabled via EEPROM or SMBus.
If the hub is configured by the internal default configuration,
this pin will be sampled at RESET_N negation to determine
if MTT support is disabled (STT only). Also, the active state
of the LED will be determined as follows:
‘0’ = MTT support is disabled, LED is active high
‘1’ = MTT support is enabled, LED is active l ow.
AM1/
GANG_EN
I/O12Amber indicator LED for port 1, Will be active low when LED
support is enabled via EEPROM or SMBus.
If the hub is configured by the internal default configuration,
this pin will be sampled at RESET_N negation to determine
if downstream port power switching and current sensing are
ganged, or individual port-by-port. Also, the active state of
the LED will be determined as follows:
Port Power
Polarity strapping.
Over Current
Sense
USB Transceiver
Bias
‘0’ = Port-by-port sensing & switching, LED is active high
‘1’ = Ganged sensing & switching, LED is active low.
PRTPWR_POLI/O12Port Power Polarity strapping determination for the active
signal polarity of the 7:1PRTPWR pins.
While RESET_N is asserted, the logic state of this pin will
(though the use of internal combinatorial logic) determine
the active state of the 7:1PRTPWR pins in order to ensure
that downstream port power is not inadvertently enabled to
inactive ports during a hardware reset.
On the rising edge of RESET_N (see the applicable
RESET_N timing table in Section 5.6.1), the logi c value will
be latched internally, and will retain the active signal polarity
for the PRTPWR7:1 pin.
‘1’ = PRTPWR7:1 pins have an active ‘high’ polarity
‘0’ = PRTPWR7:1 pins have an active ‘low’ polarity
OCS7:1_NIPUInput from external current monitor indicating an over-
current condition. {Note: Contains internal pull-up to 3.3V
supply}
RBIASI-RA 12.0kΩ (+/− 1%) resistor is attached from ground to this
pin to set the transceiver’s internal bias settings.
SMSC USB250711Revision 2.3 (08-27-07)
DATASHEET
Integrated USB 2.0 Compatible 7-Port Hub
Table 4.1 7-Port Hub Pin Descriptions (continued)
NAMESYMBOLTYPEFUNCTION
SERIAL PORT INTERFACE
Datasheet
Serial Data/SMB
Data
Serial Clock/SMB
Clock
&
Config Select 0
Configuration
Programming
Select
SDA/SMBDATAIOSD12(Serial Data)/(SMB Data) signal.
SCL/SMBCLK/
CFG_SEL0
IOSD12(Serial Clock)/(SMB Clock) signal. This multifunction pin is
read on the rising edge of RESET_N (see the applicable
RESET_N timing table in Section 5.6.1) and will dete rmine
the hub configuration method as described in Table 4.2.
CFG_SEL1IThis multifunction pin is read on the risi ng edge of
RESET_N (see the applicable RESET_N timing table in
Section 5.6.1) and will determine the hub config uration
method as described in Table 4.2.
Table 4.2 SMBus or EEPROM Interface Behavior
CFG_SEL1CFG_SEL0SMBus or EEPROM interface behavior.
00Reserved
01Configured as an SMBus slave for external download of user-
defined descriptors. SMBus slave address is 0101100
10Internal Default Configuration via strapping options.
112-wire (I2C) EEPROMS are supported,
Table 4.3 Miscellaneous Pins
NAMESYMBOLTYPEFUNCTION
Crystal
Input/External
Clock Input
XTAL1/
CLKIN
ICLKx24MHz crystal or external clock input.
This pin connects to either one terminal of the crystal or
to an external 24MHz clock when a crystal is not used.
Crystal OutputXTAL2OCLKx24MHz 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 Input
Enable
CLKIN_ENIClock 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.
RESET InputRESET_NISThis active low signal is used by the system to reset the
chip. The minimum active low pulse is 1us.
Self-Power /
Bus-Power
Detect
SELF_PWRIDetects availability of local self-power source.
Low = Self/local power source is NOT available (i.e., Hub
gets all power from Upstream USB VBus).
High = Self/local power source is available.
TEST PinsTEST[1:0]IPDUsed for testing the chip. User must treat as a no-
connect or connect to ground.
Revision 2.3 (08-27-07)12SMSC USB2507
DATASHEET
Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
Table 4.3 Miscellaneou s Pin s (continued)
NAMESYMBOLTYPEFUNCTION
Analog Test
&
Internal 1.8V
voltage
regulator
enable
ATEST/
REG_EN
AIOThis signal is used for testing the analog section of the
chip, and to enable or disable the internal 1.8v regulator.
This pin must be connected to VDDA33 to enable the
internal 1.8V regulator, or to VSS to disable the internal
regulator.
When the internal regulator is enabled, the 1.8V power
pins must be left unconnected, except for the required
bypass capacitors.When the PHY is in test mode, the
internal regulator is disabled and the ATEST pin
functions as a test pin.
Table 4.4 Power, Ground, and No Connect
NAMESYMBOLTYPEFUNCTION
VDDCORE3P3VDD33CR+3.3V I/O Power.
If the internal core 1.8V regulator is enabled, then this pin
acts as the regulator input
VDD1P8VDD18+1.8V core power.
If the internal regulator is enabled, then VDD18 pin 50
must have a 4.7μF (or greater) ±20% (ESR <0.1Ω)
capacitor to VSS
VDDAPLL3P3VDDA33PLL+3.3V Filtered analog power for the internal PLL
If the internal PLL 1.8V regulator is enabled, then this pin
acts as the regulator input
VDDAPLL1P8VDDA18PLL+1.8V Filtered analog power for internal PLL.
If the internal regulator is enabled, then this pin must
have a 4.7μF (or greater) ±20% (ESR <0.1Ω) capacitor
to VSS
VDDIO3P3VDD33+3.3V I/O power.
VDDA3P3VDDA33+3.3V Filtered analog power.
VSSVSSGround.
Table 4.5 Buffer Type Descriptions
BUFFERDESCRIPTION
IInput.
IPDInput, with a weak Internal pull-down.
IPUInput, with a weak Internal pull-up.
ISInput with Schmitt trigger.
O12Output 12mA.
SMSC USB250713Revision 2.3 (08-27-07)
DATASHEET
Table 4.5 Buffer Type Descriptions (continued)
BUFFERDESCRIPTION
I/O12Input/Output, 12mA
Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
IOSD12Open drain….12mA sink with Schmitt trigger, and must meet I2C-Bus Specification Version 2.1
requirements.
ICLKxXTAL Clock Input
OCLKxXTAL Clock Output
I-RRBIAS
IO-UDefined in USB Specification.
Note: Meets USB 1.1 requirements when operating as a 1.1-compliant device and meets USB
2.0 requirements when operating as a 2.0-compliant device.
AIOAnalog Input/output. Per PHY test requirements.
Revision 2.3 (08-27-07)14SMSC USB2507
DATASHEET
Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
Chapter 5 Functional Block Description
5.17-Port Hub
SMSC’s USB 2.0 7-Port Hub is fully specification compliant to the Universal Serial Bus Specification
Revision 2.0 April 27,2000 (12/7/2000 and 5/28/2002 Errata). Please reference Chapter 11 (Hub
Specification) for general details regarding Hub operation and functionality.
For performance reasons, the 7-Port Hub provides 1 Transaction Translator (TT) per port (defined as
Multi-TT configuration), divided into 4 non-peri odic buffers per TT.
5.1.1Hub Configuration Options
The SMSC Hub supports a large number of features and must be configured in order to correctly
function when attached to a USB host controller. There are three principal ways to configure the hub:
SMBus, EEPROM, or by internal default settings. In all cases, the configuration method will be
determined by the CFG_SEL1 and CFG_SEL0 pins immediately after RESET_N negation.
5.1.1.1Vendor ID
Is a 16-bit value that uniquely identifies the Vendor of the user device (assigned by USB-Interface
Forum). This field is set by the OEM using either the SMBus or EEPROM interface options. When
using the internal default option, SMSC’s VID (see Table 5.1) wil l be reported.
5.1.1.2Product ID
Is a 16-bit value that the Vendor can assign that uniquely identifies this particular product (assigned
by OEM). This field is set by the OEM using either the SMBus or EEPROM interface options. When
using the internal default option, SMSC’s PID designation of (see Table 5.1) will be reported.
5.1.1.3Device ID
Is a 16-bit device release number in BCD format (assigned by OEM). This field is set by the OEM
using either the SMBus or EEPROM interface options. When using the internal default option, SMSC’s
DID designation of (see Table 5.1) will be reported.
5.1.1.4Self-Powered/Bus-Powered
The Hub is either Self-Powered (draws less than 2mA of upstream bus power) or Bus-Powered
(limited to a 100mA maximum of upstream power prior to being configured by the host controller).
When configured as a Bus-Powered device, the SMSC Hub consumes less than 100mA of current
prior to being configured. After configuration, the Bus-Powered SMSC Hub (along with all associated
hub circuitry, any embedded devices if part of a compound device, and 100mA per externally available
downstream port) must consume no more than 500mA of upstream VBUS current. The current
consumption is system dependent, and the OEM must ensure that the USB 2.0 specifications are not
violated.
When configured as a Self-Powered device, <1mA of upstream VBUS current is consumed and all 7
ports are available, with each port being capable of sourcing 500mA of current.
This field is set by the OEM using either the SMBus or EEPROM interface options. When using the
internal default option, the SELF_PWR pin determines the Self-powered or Bus-powered status.
Please see the description under Dynamic Power for the self/bus power functionality when dynamic
power switching is enabled.
SMSC USB250715Revision 2.3 (08-27-07)
DATASHEET
5.1.1.5Port Indicators
Controls the use of LED indicator for Port status information. See Section 11.5.3 of the USB 2.0
Specification for additional details.
This field is set by the OEM using either the SMBus or EEPROM interface options. When using the
internal default option, the LED_EN pin enables/disables LED Indicator support.
5.1.1.6High-Speed Disable
Allows an OEM to force the Hub to configure as a Full-Speed device only (i.e. High-Speed not
available).
This field is set by the OEM using either the SMBus or EEPROM interface options.
5.1.1.7Multiple-TT Support
Selects between a mode where only one transaction translator is avail able for all ports (Single-TT), or
each port gets a dedicated transaction translator (Multi-TT) {Note: The host may force Single-TT mode
only}.
This field is set by the OEM using either the SMBus or EEPROM interface options. When using the
internal default option, the MTT_EN pin enables/disables MTT support.
Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
5.1.1.8EOP Disable
During FS operation only, this permits the Hub to send EOP if no downstream traffic is detected at
EOF1. See Section 11.3.1 of the USB 2.0 Specification for additional details.
This field is set by the OEM using either the SMBus or EEPROM interface options.
5.1.1.9Current Sensing
Selects current sensing on a port-by-port basis, all ports ganged, or none.
This field can be set by the OEM using either the SMBus or EEPROM interface options.When using
the internal default option, the SELF_PWR pin det ermines if current sensing will be ganged, or none
(ganged if self-powered, none if bus-powered)
5.1.1.10Downstream Port Power Enabling
Enables all ports simultaneously (ganged), or port power is individually switched on and off on a portby-port basis. The ability to support power enabling on a port or ganged basis is hardware
implementation dependent.
This field is set by the OEM using either the SMBus or EEPROM interface options. When using the
internal default option, the GANG_EN pin will confi gure the hub for ganged or individual port-by-port
port power switching.
5.1.1.11Compound Device
Allows the OEM to indicate that the Hub is part of a compound (see the USB Specification for
definition) device. The applicable port(s) must also be defin ed as having a “Non-Removable Device”.
This field is set by the OEM using either the SMBus or EEPROM interface options.
Note: When configured via strapping options, declaring a port as non-removable automa tically causes
the hub controller to report that it is part of a compound device.
Revision 2.3 (08-27-07)16SMSC USB2507
DATASHEET
Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
5.1.1.12Non-Removable Device
Informs the Host if one of the active ports has a permanent device that is undetachable from the Hub.
(Note: The device must provide its own descriptor data.)
This field is set by the OEM using either the SMBus or EEPROM interface options. When using the
internal default option, the NON_REM[1:0] pins will designate the appropriate ports as being nonremovable.
5.1.1.13Self-Powered Port DISABLE
During Self-Powered operation, this selects the ports which will be permanently disabled, and are not
available to be enabled or enumerated by a Host Controller. The disabled ports must be contiguous,
and must be in decreasing order starting with port 7.
This field is set by the OEM using either the SMBus or EEPROM interface options. When using the
internal default option, the PRT_DIS[1:0] pins will disable the appropriate ports.
5.1.1.14Bus-Powered Port DISABLE
During Bus-Powered operation, this selects the ports which will be permanently disabled, and are not
available to be enabled or enumerated by a Host C ontroller. The disabled ports must be contiguous,
and must be in decreasing order starting with port 7.
This field is set by the OEM using either the SMBus or EEPROM interface options. When using the
internal default option, the PRT_DIS[1:0] pins will disable the appropriate ports.
5.1.1.15Dynamic Power
Controls the ability of the 7-Port Hub to automatically change from Self-Powered operation to BusPowered operation if the local power source is removed or is unavailable (and from Bu s-Powered to
Self-Powered if the local power source is restored). {Note: If the local power source is available, the
7-port Hub will always switch to Self-Powered operation.}
When Dynamic Power switching is enabled, the Hub detects the availability of a local power source
by monitoring the external SELF_PWR pin. If the Hub detects a change in power source availability,
the Hub immediately disconnects and removes power from all downstream devices and disconnects
the upstream port. The Hub will then re-attach to the upstream port as either a Bus-Powered Hub (if
local-power in unavailable) or a Self-Powered Hub (if local power is available).
This field is set by the OEM using either the SMBus or EEPROM interface options.
5.1.1.16Over-Current Timer
The time delay (in 2ms increments) for an over-current condition to persist before it is reported to the
Host.
This field is set by the OEM using either the SMBus or EEPROM interface options.
5.1.1.17Self-Powered Max Power
When in Self-Powered configuration, Sets value in 2mA increments.
This field is set by the OEM using either the SMBus or EEPROM interface options.
5.1.1.18Bus-Powered Max Power
When in Bus-Powered configuration, Sets value in 2mA increments.
This field is set by the OEM using either the SMBus or EEPROM interface options.
SMSC USB250717Revision 2.3 (08-27-07)
DATASHEET
5.1.1.19Self-powered Hub Controller Current
When in Self-Powered configuration, Maximum current requirements of the Hub Controller in 2mA
increments.
This field is set by the OEM using either the SMBus or EEPROM interface options.
5.1.1.20Bus-Powered Hub Controller Current
When in Bus-Powered configuration, Maximum current requirements of the Hub Controller in 2mA
increments.
This field is set by the OEM using either the SMBus or EEPROM interface options.
5.1.1.21Power-On Timer
Time (in 2ms intervals) from the time power-on sequence begins on a port until power is good on that
port. System software uses this value to determine how long to wait before accessing a powered-on
port.
This field is set by the OEM using either the SMBus or EEPROM interface options.
5.1.1.22Power Switching Polarity
Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
The selection of active state “polarity” for the PRTPWR[7:1] pins is made by a strapp ing option only.
5.1.2VBus Detect
According to Section 7.2.1 of the USB 2.0 Specification, a downstream port can never provide power
to its D+ or D- pull-up resistors unless the upstream port’s VBUS is in the asserted (powered) state.
The VBUS_DET pin on the Hub monitors the state of the upstream VBUS signal and will not pull-up
the D+ or D- resistor if VBUS is not active. If VBUS goes from an active to an inactive state (Not
Powered), Hub will remove power from the D+ or D- pull-up resistor with in 10 seconds.
5.2EEPROM Interface
The SMSC Hub can be configured via a 2-wire (I2C) EEPROM. (Please see Table 4.1, "7-Port Hub
Pin Descriptions" for specific details on how to enable the I2C EEPROM option).
The Internal state-machine will, (when configured for EEPROM support) read the external EEPROM
for configuration data. The hub will then “attach” to the upstream USB host.
Please see Table 5.1 User-Define d Descriptor Data for a list of data fields available.
5.2.1I2C EEPROM
The I2C EEPROM interface implements a subset of the I2C Master Specification (Please refer to the
Philips Semiconductor Standard I2C-Bus Specification for details on I2C bus protocols). The Hub’s I2C
EEPROM interface is designed to attach to a single “dedicated” I2C EEPROM, and it conforms to the
Standard-mode I2C Specification (100kbit/s transfer rate and 7-bit addressing) for protocol and
electrical compatibility.
Note: Extension s to the I2C Specification are not supported.
The Hub acts as the master and generates the serial clock SCL, contro ls the bus access (determines
which device acts as the transmitter and which device acts as the receiver), and generates the START
and STOP conditions.
Revision 2.3 (08-27-07)18SMSC USB2507
DATASHEET
Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
5.2.1.1Implementation Characteristics
Please refer to the MicroChip 24AA00 DataSheet for Protocol and Progra mming specifics.
5.2.1.2Pull-Up Resistor
The Circuit board designer is required to place external pull-up resistors (10K Ω recommended) on the
SDA/SMBDATA & SCL/SMBCLK/CFG_SELO lines (per SMBus 1.0 Specification, and EEPROM
manufacturer guidelines) to Vcc in order to assure proper operation.
5.2.1.3I2C EEPROM Slave Address
Slave address is 1010000.
Note: 10-b it addressing is NOT supported.
5.2.2In-Circuit EEPROM Programming
The EEPROM can be programmed via ATE by pulling RESET_N low (which tri-states the Hub’s
EEPROM interface and allows an external source to program the EEPROM).
5.2.3EEPROM DATA
Table 5.1 User-De fined Descriptor Data
DEFAULT
BYTE
MSB:
FIELD
VID1:02042404 24Vendor ID (assigned by USB-IF).
PID3:22250725 07Product ID (assigned by Manufacturer).
DID5:4200000000Device ID (assigned by Manufacturer).
Config Data
Byte 1
Config Data
Byte 2
Non
Removable
Device
Port Disable
Self-Powered
Port Disable
Bus-Powered
Max Power
Self-Powered
LSB
61981CConfiguration data byte #1 for Hub options.
711090Configuration data byte #2 for Hub options.
810000Defines the ports that contain attached
910000Selects the ports that will be permanently
A10000Selects the ports that will be permanently
B10101Max Current for this configuration (expressed
SIZE
(BYTES)
CFG
SELF
(HEX)
DEFAULT
CFG
BUS
(HEX)DESCRIPTION
devices (this is used only when Hub is part of
a compound device).
disabled
disabled
in 2mA units).
Max Power
Bus-Powered
Hub Controller
Max Current
Self-Powered
SMSC USB250719Revision 2.3 (08-27-07)
C16464Ma x Current for th is configur ation (exp re ssed
in 2mA units).
D10101Ma x Current (expressed in 2mA units).
DATASHEET
Integrated USB 2.0 Compatible 7-Port Hub
Table 5.1 User-Defined Descriptor Data (continued)
Datasheet
FIELD
Hub Controller
Max Current
Bus-Powered
Power-On
Time
DEFAULT
BYTE
MSB:
LSB
E16464Max Current (expressed in 2mA units).
F13232Time until power is stable.
SIZE
(BYTES)
CFG
SELF
(HEX)
DEFAULT
CFG
BUS
(HEX)DESCRIPTION
5.2.3.1EEPROM Offset 1:0(h) - Vendor ID
BIT
NUMBERBIT NAMEDESCRIPTION
15:8VID_MSBMost Significant Byte of the Vendor ID.
7:0VID_LSBLeast Significant Byte of the Vendor ID.
5.2.3.2EEPROM Offset 3:2(h) - Product ID
BIT
NUMBERBIT NAMEDESCRIPTION
15:8PID_MSBMost Significant Byte of the Product ID.
7:0PID_LSBLeast Significant Byte of the Product ID.
5.2.3.3EEPROM Offset 5:4(h) - Device ID
BIT
NUMBERBIT NAMEDESCRIPTION
15:8DID_MSBMost Significant Byte of the Device ID.
7:0DID_LSBLeast Significant Byte of the Device ID.
5.2.3.4EEPROM Offset 6(h) - CONFIG_BYTE_1
BIT
NUMBERBIT NAMEDESCRIPTION
7SELF_BUS_PWRSelf or Bus Power: Selects between Self- and Bus-Powered operation.
Note: If Dynamic Power Switching is enabled, this bit is ignored and the
SELF_PWR pin is used to determine if the hub is operating from self or bus
power.
6PORT_INDPort Indicator Support: Indicates implementation of LED indicators
0 = No LED indicators.
1 = LED indicators.
Revision 2.3 (08-27-07)20SMSC USB2507
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Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
BIT
NUMBERBIT NAMEDESCRIPTION
5HS_DISABLEHigh Speed Disable: Disables the capability to attach as either a High/Full-
4MTT_ENABLEMulti-TT enabl e: Enables one transaction translator per port operation.
3EOP_DISABLEEOP Disable: Disables EOP gene ration at EOF1 when no downstream
2:1CURRENT_SNSOver Current Sense: Indicates whether current sensing is on a port-by-port
0PORT_PWRPort Power Switching: Indicates whether port power switching is on a port-
speed device, and forces attachment as Full-speed only i.e. (no High-Speed
support).
7DYNAMICDynamic Power Enable: Controls the ability for the Hub to transition to Bus-
6ReservedReserved
5:4OC_TIMEROverCurrent Timer: Over Current Timer delay.
3COMPOUNDCompound Device: Designate s if Hub is part of a compound device.
2:0ReservedReserved.
Powered operation if the local power source is removed (can revert back to
Self-Power if local power source is restored).
0 = No Dynamic auto-switching.
1 = Dynamic Auto-switching capable.(Default)
00 = 0.1ms
01 = 2ms (Default)
10 = 4ms
11 = 6 m s
0 = No. (Default)
1 = Yes, Hub is part of a compound device.
SMSC USB250721Revision 2.3 (08-27-07)
DATASHEET
Integrated USB 2.0 Compatible 7-Port Hub
5.2.3.6EEPROM Offset 8(h) - Non-Removable Device
BIT
NUMBERBIT NAMEDESCRIPTION
7:0NR_DEVICENon-Removable Device: Indicates which port(s) include non-removable devic-
es. ‘0’ = port is removable, ‘1’ = port is non-removable.
Bit 7= 1; Port 7 non-removable.
Bit 6= 1; Port 6 non-removable.
Bit 5= 1; Port 5 non removable.
Bit 4= 1; Port 4 non-removable.
Bit 3= 1; Port 3 non-removable.
Bit 2= 1; Port 2 non-removable.
Bit 1= 1; Port 1 non removable.
Bit 0 is Reserved, always = ‘0’.
5.2.3.7EEPROM Offset 9(h) - Port Disable For Self Powered Operation
BIT
NUMBERBIT NAMEDESCRIPTION
Datasheet
7:0PORT_DIS_SPPort Disable Self-Powered: Disables 1 or more contiguous ports. ‘0’ = port
is available, ‘1’ = port is disabled.
Bit 7= 1; Port 7 is disabled.
Bit 6= 1; Port 6 is disabled.
Bit 5= 1; Port 5 is disabled.
Bit 4= 1; Port 4 is disabled.
Bit 3= 1; Port 3 is disabled.
Bit 2= 1; Port 2 is disabled.
Bit 1= 1; Port 1 is disabled.
Bit 0 is Reserved, always = ‘0’
5.2.3.8EEPROM Offset A(h) - Port Disable For Bus Powered Operation
BIT
NUMBERBIT NAMEDESCRIPTION
7:0PORT_DIS_BPPort Disable Bus-Powered: Disables 1 or more contiguous ports. ‘0’ = port
is available, ‘1’ = port is disabled.
Bit 7= 1; Port 7 is disabled.
Bit 6= 1; Port 6 is disabled.
Bit 5= 1; Port 5 is disabled.
Bit 4= 1; Port 4 is disabled.
Bit 3= 1; Port 3 is disabled.
Bit 2= 1; Port 2 is disabled.
Bit 1= 1; Port 1 is disabled.
Bit 0 is Reserved, always = ‘0’
Revision 2.3 (08-27-07)22SMSC USB2507
DATASHEET
Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
5.2.3.9EEPROM Offset B(h) - Max Power For Self Powered Operation
BIT
NUMBERBIT NAMEDESCRIPTION
7:0MAX_PWR_SPMax Power Self_Powered: Value in 2mA increments that the Hub consumes
from an upstream port (VBUS) when operating as a self-powered hub. This
value includes the hub silicon along with the combi ned power consumption
(from VBUS) of all associated circuitry on the board. This value also includes
the power consumption of a permanently attached peripheral if the hub is
configured as a compound device, and the embedded peripheral reports
0mA in its descriptors.
Note: The USB 2.0 Specification does not permit this value to exceed
100mA
A value of 50 (decimal) indicates 100mA.
5.2.3.10EEPROM Offset C(h) - Max Power For Bus Powered Operation
BIT
NUMBERBIT NAMEDESCRIPTION
7:0MAX_PWR_BPMax Power Bus_Powered: Value in 2mA increments that the Hub consumes
from an upstream port (VBUS) when operating as a bus-powered hub. This
value includes the hub silicon along with the combi ned power consumption
(from VBUS) of all associated circuitry on the board. This value also includes
the power consumption of a permanently attached peripheral if the hub is
configured as a compound device, and the embedded peripheral reports
0mA in its descriptors.
A value of 50 (decimal) indicates 100mA.
5.2.3.11EEPROM Offset D(h) - Hub Controller Max Current For Self Powered Operation
BIT
NUMBERBIT NAMEDESCRIPTION
7:0HC_MAX_C_SPHub Controller Max Current Self -Powered: Value in 2mA increments that the
Hub consumes from an upstream port (VBUS) when operating as a selfpowered hub. This value includes the hub silicon along with the combined
power consumption (from VBUS) of all associated circuitry on the board.
This value does NOT include the power consumption of a permanently
attached peripheral if the hub is configured as a compound device.
Note: The USB 2.0 Specification does not permit this value to exceed
100mA
A value of 50 (decimal) indicates 100mA, which is the default value.
SMSC USB250723Revision 2.3 (08-27-07)
DATASHEET
Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
5.2.3.12EEPROM Offset E(h) - Hub Controller Max Current For Bus Powered Operation
BIT
NUMBERBIT NAMEDESCRIPTION
7:0HC_MAX_C_BPHub Controller Max Current Bus-Powered: Value in 2mA increments that the
Hub consumes from an upstream port (VBUS) when operating as a selfpowered hub. This value includes the hub silicon along with the combined
power consumption (from VBUS) of all associated circuitry on the board.
This value does NOT include the power consumption of a permanently
attached peripheral if the hub is configured as a compound device.
A value of 50 (decimal) indicates 100mA, which is the default value.
5.2.3.13EEPROM Offset F(h) - Power-On Time
BIT
NUMBERBIT NAMEDESCRIPTION
7:0POWER_ON_TIMEPower On Time: The length of time that is takes (in 2 ms intervals) from the
time the host initiated power-on sequence begins on a port until power is
good on that port.
5.3SMBus Slave Interface
Instead of loading User-Defined Descriptor data from an external EEPROM, the SMSC Hub can be
configured to receive a code load from an external processor via an SMBus interface. The SMBus
interface shares the same pins as the EEPROM interface, if CFG_SEL1 & CFG_SEL0 activates the
SMBus interface, external EEPROM support is no longer available (and the user-defined descriptor
data must be downloaded via the SMBus). Due to system issues, the SMSC Hub waits indefinitely for
the SMBus code load to complete and only “appears” as a newly connected device on USB after the
code load is complete.
The Hub’s SMBus implementation is a subset of the SMBus interface to the host. The device is a
slave-only SMBus device. The implementation in the device is a subset of SMBus since it only supports
two protocols.
The Write Byte and Read Byte protocols are the only valid SMBus protocols for the Hub. The Hub
responds to other protocols as described in Section 5.3.2, "In valid Protocol Response Behavior," on
page 25. Reference the System Management Bus Specification, Rev 1.0.
The SMBus interface is used to read and write the registers in the device. The register set is shown
in Section 5.3.9, "Internal SMBus Memory Register Set," on page 26.
5.3.1Bus Protocols
Typical Write Byte and Read Byte protocols are shown below. Register accesses are performed using
7-bit slave addressing, an 8-bit register address field , and an 8-bit data field. The shading indicates
the Hub driving data on the SMBDATA line; otherwise, host data is on the SDA/SMBDATA line.
The slave address is the unique SMBus Interface Address for the Hub that identifies it on SMBus. The
register address field is the internal address of the register to be accessed. The register data field is
the data that the host is attempting to write to the register or th e contents of the register that the host
is attempting to read.
Note: Data bytes are transferred MSB first (msb fi rst).
Revision 2.3 (08-27-07)24SMSC USB2507
DATASHEET
Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
5.3.1.1Byte Protocols
When using the Hub SMBus Interface for byte transfers, a write will always consist of the SMBus
Interface Slave Address byte, followed by the Internal Address Register byte, then the data byte.
The normal read protocol consists of a write to the HUB with the SMBus Interface Address byte,
followed by the Internal Address Register byte. Then restart the Serial Communication with a Read
consisting of the SMBus Interface Address byte, followed by the data byte read from the Hub. This
can be accomplished by using the Read Byte protocol.
Note: For th e following SMBus tables:
Denotes Master-to-SlaveDenotes Slave-to-Master
Write B yte
The Write Byte protocol is used to write data to the registers. The data will only be written if the protocol
shown in Table 5.2 is performed correctly. Only one byte is transferred at a time for a Write Byte
protocol.
Table 5. 2 SMBus Write Byte Protocol
Field:StartSlave AddrWr
Bits:1 71181811
Read Byte
The Read Byte protocol is used to read data from the registers. The data will only be read if the
protocol shown in Table 5.3 is performed correctly. Only one byte is transferred at a time for a Read
Byte protocol.
Table 5.3 SMBus Read Byte Protocol
Field:StartSlave
Addr
Bits:1711811711811
WrAckReg.
AckReg. AddrAckReg. Data AckStop
Addr
AckStartSlave
Addr
RdAckReg.
Data
NackStop
5.3.2Invalid Protocol Response Behavior
Registers that are accessed with an invalid protocol are not updated. A register is only updated
following a valid protocol. The only valid protocols are Write Byte and Read Byte, which are described
above.
The Hub only responds to the hardware selected Slave Address.
Attempting to communicate with the Hub over SMBus with an invalid slave address or invalid protocol
results in no response, and the SMBus Slave Interface returns to the idle state.
The only valid registers that are accessible by the SMBus slave address are the registers defined in
the Registers Section. See Section 5.3.3 for the response to undefined registers.
5.3.3General Call Address Response
The Hub does not respond to a general call address of 0000 _000b.
SMSC USB250725Revision 2.3 (08-27-07)
DATASHEET
5.3.4Slave Device Time-Out
According to the SMBus Specification, V1.0 devices in a transfer can abort the transfer in progress
and release the bus when any single clock low interval exceed s 25ms (T
have detected this condition must reset their communication and be able to receive a new START
condition no later than 35ms (T
Note: Some simple devices do not contain a clock low drive ci rcuit; this si mple kind of device typica lly
resets its communications port after a start or stop condition.
TIMEOUT, MAX
5.3.5Stretching the SCLK Signal
The Hub supports stretching of the SCLK by other devices on the SMBus. The Hub does not stretch
the SCLK.
5.3.6SMBus Timing
The SMBus Slave Interface complies with the SMBus AC Timing Specification. See the SMBus timing
in the “Timing Diagram” section.
5.3.7Bus Reset Sequence
Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
TIMEOUT, MIN
).
). Devices that
The SMBus Slave Interface resets and returns to the idle state upon a START field followed
immediately by a STOP field.
5.3.8SMBus Alert Response Address
The SMBALERT# signal is not supported by the Hub.
5.3.9Internal SMBus Memory Register Set
The following table provides the SMBus slave interface register map values.
7:3ReservedReserved. {Note: Software must never write a ‘1’ to these bits}
2RESETReset the SMBus Interface and internal memory back to RESET_N assertion
default settings. {Note: During this reset, this bit is automatically cle ared to
its default value of 0.}
0 = Normal Run/Idle State.
1 = Force a reset.
BIT 0
(LSB)
1WRITE_PROTWrite Protect: Th e external SMBus ho st sets this bit after the Hub’s internal
memory is loaded with configuration data. {Note: The External SMBus Host
is responsible for verification of downloaded data.}
0 = The internal memory (address range 01-10h) is no t write protected.
1 = The internal memory (address range 01-10h) is “write-prote cted” to
prevent unintentional data corruption.}
{Note: This bit is write once and is only cleared by assertion of the external
RESET_N pin.}
0USB_ATTACHUSB Attach & power-down the SMBus Interface.
0 = Default; SMBus slave interface is active.
1 = Hub will signal a USB attach event to an upstream device, Note: SMBus
Slave interface will completely power down after the ACK has completed.
{Note: This bit is write once and is only cleared by assertion of the external
RESET_N pin.}
5.3.9.2Register 01h: Vendor ID (LSB) (Reset = 0x00)
BIT
NUMBERBIT NAMEDESCRIPTION
7:0VID_LSBLeast Significant Byte of the Vendor ID.
SMSC USB250727Revision 2.3 (08-27-07)
DATASHEET
Integrated USB 2.0 Compatible 7-Port Hub
5.3.9.3Register 02h: Vendor ID (MSB) (Reset = 0x00)
BIT
NUMBERBIT NAMEDESCRIPTION
7:0VID_MSBMost Significant Byte of the Vendor ID.
5.3.9.4Register 03h: Product ID (LSB) (Reset = 0x00)
BIT
NUMBERBIT NAMEDESCRIPTION
7:0PID_LSBLeast Significant Byte of the Product ID.
5.3.9.5Register 04h: Product ID (MSB) (Reset = 0x00)
BIT
NUMBERBIT NAMEDESCRIPTION
7:0PID_MSBMost Significant Byte of the Product ID.
Datasheet
5.3.9.6Register 05h: Device ID (LSB) (Reset = 0x00)
BIT
NUMBERBIT NAMEDESCRIPTION
7:0DID_LSBLeast Significant Byte of the Device ID.
5.3.9.7Register 06h: Device ID (MSB) (Reset = 0x00)
BIT
NUMBERBIT NAMEDESCRIPTION
7:0DID_MSBMost Significa nt Byte of the Device ID.
5.3.9.8Register 07h: CONFIG_BYTE_1 (Reset = 0x00)
BIT
NUMBERBIT NAMEDESCRIPTION
7SELF_BUS_PWRSelf or Bus Power: Selects between Self- and Bus-Powered operation.
Note: If Dynamic Power Switching is enabled, this bit is ignored and the
SELF_PWR pin is used to determine if the hub is operating from self or bus
power.
6PORT_INDPort Indicator Support: Indicates implementation of LED indicato rs
0 = No LED indicators.
1 = LED indicators.
Revision 2.3 (08-27-07)28SMSC USB2507
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Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
BIT
NUMBERBIT NAMEDESCRIPTION
5HS_DISABLEHigh Speed Disable: Disables the capability to attach as either a High/Full-
4MTT_ENABLEMulti-TT enabl e: Enables one transaction translator per port operation.
3EOP_DISABLEEOP Disable: Disables EOP generation of EOF1 whe n in Full-Speed mode.
2:1CURRENT_SNSOver Current Sense: Indicates whether current sensing is on a port-by-port
0PORT_PWRPort Power Switching: Indicates whether port power switching is on a port-
speed device, and forces attachment as Full-speed only i.e. (no High-Speed
support).
7:0NR_DEVICENon-Removable Device: Indicates which port(s) include non-removable devic-
es. ‘0’ = port is removable, ‘1’ = port is non-removable.
Bit 7= 1; Port 7 non-removable.
Bit 6= 1; Port 6 non-removable.
Bit 5= 1; Port 5 non removable.
Bit 4= 1; Port 4 non-removable.
Bit 3= 1; Port 3 non-removable.
Bit 2= 1; Port 2 non-removable.
Bit 1= 1; Port 1 non removable.
Bit 0 is Reserved, always = ‘0’.
5.3.9.11Register 0Ah: Port Disable For Self Powered Operation (Reset = 0x00)
BIT
NUMBERBIT NAMEDESCRIPTION
Datasheet
7:0PORT_DIS_SPPort Disable Self-Powered: Disables 1 or more contiguous ports. ‘0’ = port
is available, ‘1’ = port is disabled.
Bit 7= 1; Port 7 is disabled.
Bit 6= 1; Port 6 is disabled.
Bit 5= 1; Port 5 is disabled.
Bit 4= 1; Port 4 is disabled.
Bit 3= 1; Port 3 is disabled.
Bit 2= 1; Port 2 is disabled.
Bit 1= 1; Port 1 is disabled.
Bit 0 is Reserved, always = ‘0’
5.3.9.12Register 0Bh: Port Disable For Bus Powered Operation (Reset = 0x00)
BIT
NUMBERBIT NAMEDESCRIPTION
7:0PORT_DIS_BPPort Disable Bus-Powered: Disables 1 or more contiguous ports. ‘0’ = port
is available, ‘1’ = port is disabled.
Bit 7= 1; Port 7 is disabled.
Bit 6= 1; Port 6 is disabled.
Bit 5= 1; Port 5 is disabled.
Bit 4= 1; Port 4 is disabled.
Bit 3= 1; Port 3 is disabled.
Bit 2= 1; Port 2 is disabled.
Bit 1= 1; Port 1 is disabled.
Bit 0 is Reserved, always = ‘0’
5.3.9.13Register 0Ch: Max Power For Self Powered Operation (Reset = 0x00)
BIT
NUMBERBIT NAMEDESCRIPTION
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Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
7:0MAX_PWR_SPMax Power Self_Powered: Value in 2mA increments that the Hub consumes
from an upstream port (VBUS) when operating as a self-powered hub. This
value includes the hub silicon along with the combi ned power consumption
(from VBUS) of all associated circuitry on the board. This value also includes
the power consumption of a permanently attached peripheral if the hub is
configured as a compound device, and the embedded peripheral reports
0mA in its descriptors.
Note: The USB 2.0 Specification does not permit this value to exceed
100mA
A value of 50 (decimal) indicates 100mA.
5.3.9.14Register 0Dh: Max Power For Bus Powered Operation (Reset = 0x00)
BIT
NUMBERBIT NAMEDESCRIPTION
7:0MAX_PWR_BPMax Power Bus_Powered: Value in 2mA increments that the Hub consumes
from an upstream port (VBUS) when operating as a bus-powered hub. This
value includes the hub silicon along with the combi ned power consumption
(from VBUS) of all associated circuitry on the board. This value also includes
the power consumption of a permanently attached peripheral if the hub is
configured as a compound device, and the embedded peripheral reports
0mA in its descriptors.
A value of 50 (decimal) indicates 100mA.
5.3.9.15Register 0Eh: Hub Controller Max Current For Self Powered Operation (Reset = 0x00)
BIT
NUMBERBIT NAMEDESCRIPTION
7:0HC_MAX_C_SPHub Controller Max Current Self -Powered: Value in 2mA increments that the
Hub consumes from an upstream port (VBUS) when operating as a selfpowered hub. This value includes the hub silicon along with the combined
power consumption (from VBUS) of all associated circuitry on the board.
This value does NOT include the power consumption of a permanently
attached peripheral if the hub is configured as a compound device.
Note: The USB 2.0 Specification does not permit this value to exceed
100mA
A value of 50 (decimal) indicates 100mA, which is the default value.
5.3.9.16Register 0Fh: Hub Controller Max Current For Bus Powered Operation (Reset = 0x00)
BIT
NUMBERBIT NAMEDESCRIPTION
7:0HC_MAX_C_BPHub Controller Max Current Bus-Powered: Value in 2mA increments that the
Hub consumes from an upstream port (VBUS) when operating as a buspowered hub. This value will include the hub silicon along with the combined
power consumption (from VBUS) of all associated circuitry on the board.
This value will NOT include the power consumption of a permanentl y
attached peripheral if the hub is configured as a compound device.
A value of 50 (decimal) would indicate 100mA, which is the default value.
SMSC USB250731Revision 2.3 (08-27-07)
DATASHEET
Integrated USB 2.0 Compatible 7-Port Hub
5.3.9.17Register 10h: Power-On Time (Reset = 0x00)
BIT
NUMBERBIT NAMEDESCRIPTION
Datasheet
7:0POWER_ON_TIMEPower On Time: The length of time that it takes (in 2 ms intervals) from the
time the host initiated power-on sequence begins on a port until power is
good on that port.
5.3.9.18Undefined Registers
The registers shown in Table 5.4 are the defined registers in the Hub . Reads to undefined registers
return 00h. Writes to undefined registers have no effect and do not return an error.
5.3.9.19Reserved Registers
Unless otherwise instructed, only a ‘0’ may be written to all reserved registers or bits.
5.4Default Configuration Option:
The SMSC Hub can be configured via its internal default configuration. (please see Chapter 3, Pin
Configuration 7-Port Hub for specific details on how to enable default configuratio n.
Please refer to Table 5.1 on page 19 for the internal default values that are loaded when this option is
selected.
5.5Default Strapping Options:
The SMSC Hub can be configured via a combination of internal defaul t values and pin strap options.
Please see Table 4.1, "7-Port Hub Pin Descriptions" for specific details on how to enable the
default/pin-strap configuration option.
The strapping option pins only cover a limited sub-set of the configuration options. The internal d efault
values will be used for the bits & registers that are not controlled by a strapping option pin. Please
refer to Table 5.1 on page 19 for the internal default values that are loaded when this option is selected.
The Amber and Green LED pins are sampled after RESET_N negation, and the logic values are used
to configure the hub if the internal default co nfiguration mode is selected. The implementation shown
below (see Figure 5.1) shows a recommended passive scheme. When a pi n is configure d with a “Strap
High” configuration, the LED functions with active low signalling, and the PAD will “sink” the current
from the external supply. When a pin is configured with a “Strap Low” configuration, the LED functions
with active high signalling, and the PAD will “source” the current to the external LED.
Revision 2.3 (08-27-07)32SMSC USB2507
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Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
+V
Strap High
50K
GR1
HUB
GR2
Figure 5.1 LED Strapping Option
5.6Reset
There are two different resets that the Hub experiences. One is a hardware reset (via the RESET_N
pin) and the second is a USB Bus Reset.
5.6.1External Hardware RESET_N
A valid hardware reset is defined as, assertion of RESET_N for a minimum of 1us after all power
supplies are within operating range. While reset is asserted, the Hub (and its associated external
circuitry) consumes less than 500μA of current from the upstream USB power source (300μA for the
Hub and 200μA for the external circuitry).
Assertion of RESET_N (external pin) causes the following:
1. All downstream ports are disabled, and PRTPWR power to downstream devices is removed.
2. The PHYs are disabled, and the differential pairs will be in a high-impedance state.
3. All transactions immediately terminate; no states are saved.
4. All internal registers return to the default state (in most cases, 00(h)).
Strap Low
50K
5. The external crystal oscillator is halted.
6. The PLL is halted.
7. LED indicators are disabled.
The Hub is “operational” 500μs after RESET_N is negated.
Once operational, the Hub immediately reads OEM-specific data from the external EEPROM (if the
SMBus option is not disabled).
SMSC USB250733Revision 2.3 (08-27-07)
DATASHEET
5.6.1.1RESET_N for Strapping Option Configuration
Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
Hardware
reset
asserted
Read Strap
Options
t1
Drive Strap
Outputs to
inactive
levels
Attach
USB
Upstream
t5t6
USB Reset
recovery
Idle
t7t8
Start
completion
request
response
t2
Valid
t3
t4
Don’t Care
Driven by Hub if strap is an output.
RESET_N
VSS
Strap Pins
Don’t Care
VSS
Figure 5.2 Reset_N Timing for Default/Strap Option Mode
T able 5.5 Reset_N Timing for Default/Strap Option Mode
NAMEDESCRIPTIONMINTYPMAXUNITS
t1RESET_N Asserted.1μsec
t2Strap Setup Time16.7nsec
t3Strap Hold Time.16.71400nsec
t4hub outputs driven to inactive logic states2.01.5μsec
t5USB Attach (See Note).100msec
t6Host acknowledges attach and signals USB
100msec
Reset.
t7USB Idle.undefinedmsec
t8Completion time for requests (with or without data
5msec
stage).
Notes:
When in Bus-Powered mode, the Hub and its associated circuitry must not consume more than
100mA from the upstream USB power source during t1+t5.
All Power Supplies must have reached th e operating levels mandated in Section Ch apter 7, "DC
Parameters", prior to (or coincident with) the assertion of RESET_N.
Reset.
t6USB Idle.undefinedmsec
t7Completion time for requests (with or without data
5msec
stage).
Notes:
When in Bus-Powered mode, the Hub and its associated circuitry must not consume more than
100mA from the upstream USB power source during t4+t5+t6+t7.
All Power Supplies must have reached th e operating levels mandated in Section Ch apter 7, "DC
Parameters", prior to (or coincident with) the assertion of RESET_N.
SMSC USB250735Revision 2.3 (08-27-07)
DATASHEET
5.6.1.3RESET_N for SMBus Slave Configuration
Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
Start
completion
request
response
RESET_N
VSS
Hardware
reset
asserted
Reset
Negation
t1
SMBus Code
Load
t2t4
Hub PHY
Stabilization
t3
Attach
USB
Upstream
USB Reset
recovery
t5
Idle
t6t7
Figure 5.4 Reset_N Timing for SMBus Mode
T able 5.7 Reset_N T iming for SMBus Mode
NAMEDESCRIPTIONMINTYPMAXUNITS
t1RESET_N Asserted.1μsec
t2Hub Recovery/Stabilization.500μsec
t3SMBus Code Load (See Note).1099.5msec
t4Hub Configuration and USB Attach.100msec
t5Host acknowledges attach and signals USB
100msec
Reset.
t6USB Idle.Undefinedmsec
t7Completion time for requests (with or without data
5msec
stage).
Notes:
For Bus-Powered configurations, the 99.5ms (MAX) is requi red, and the Hub and its associated
circuitry must not consume more than 100mA from the upstream USB power source d uring
t2+t3+t4+t5+t6+t7. For Self-Powered configurations, t3 MAX is not applicable and the time to load
the configuration is determined by the external SMBus host.
All Power Supplies must have reached th e operating levels mandated in Section Ch apter 7, "DC
Parameters", prior to (or coincident with) the assertion of RESET_N.
5.6.2USB Bus Reset
In response to the upstream port signaling a reset to the Hub, the Hub does the following:
Note: The Hu b does not propagate the upstream USB reset to downstream devices.
1. Sets default address to 0.
2. Sets configuration to: Unconfigured.
3. Negates PRTPWR[7:1] to all downstream ports.
Revision 2.3 (08-27-07)36SMSC USB2507
DATASHEET
Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
4. Clears all TT buffers.
5. Moves device from suspended to active (if suspended).
6. Complies with Section 11.10 of the USB 2.0 Specification for behavior after completion of the reset
sequence.
The Host then configures the Hub and the Hub’s downstream port devices in accordance with the USB
Specification.
SMSC USB250737Revision 2.3 (08-27-07)
DATASHEET
Chapter 6 XNOR Test
XNOR continuity tests all signal pins on the Hub (every pin except for NC, XTAL1/CLKIN, XTAL2,
ATEST/REG_EN, RBIAS, TEST1, Power, and Ground). This functionality is enabled by driving TEST1
and CFG_SEL[1] high, driving SCLK low and transition RESET_N from low to high. The output from
the XNOR chain is driven to GR2 . For each pin tested for continuity GR2 sh ould toggle.
Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
Revision 2.3 (08-27-07)38SMSC USB2507
DATASHEET
Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
Chapter 7 DC Parameters
7.1Maximum Guaranteed Ratings
PARAMETERSYMBOLMINMAXUNITSCOMMENTS
Storage
Temperature
Lead
Temperature
1.8V supply
voltage
3.3V supply
voltage
Voltage on any
I/O pin
Voltage on
XTAL1
Voltage on
XTAL2
Note: Stresses above the specified parameters could cause permanent damage to the device. This
T
A
-55150°C
325°CSoldering < 10 seconds
V
DDA18PLL
V
DD18
V
DDA33
V
DDA33PLL
V
DD33
V
DD33CR
-0.52.5V
-0.54.0V
-0.5(3.3V supply voltage + 2) ≤ 6V
-0.54.0V
-0.5V
+ 0.3VV
DD18
is a stress rating only and functional operation of the device at any condition above those
indicated in the operation sections of this specification is not implied. When powering this
device from laboratory or system power supplies, it is important that the Absolute Maximum
Ratings not be exceeded or device failure can result. Some power supplies exhibit voltage
spikes on their outputs when the AC power is switched on or off. In addition, voltage transients
on the AC power line may appear on the DC output. When this possibi lity exists, it is suggested
that a clamp circuit be used.
SMSC USB250739Revision 2.3 (08-27-07)
DATASHEET
Integrated USB 2.0 Compatible 7-Port Hub
7.2Recommended Operating Conditions
PARAMETERSYMBOLMINMAXUNITSCOMMENTS
Datasheet
Operating
Temperature
1.8V supply voltageV
3.3V supply voltageV
T
A
DDA18PLL
V
DD18
DDA33
V
DDA33PLL
V
DD33
V
DD33CR
070°C
1.621.98V
3.03.6V
Voltage on any I/O pin-0.35.5VIf any 3.3V supply voltage drops
below 3.0V, then the MAX
becomes:
(3.3V supply voltage + 0.5)
Voltage on XTAL1 -0.3V
Voltage on XTAL2-0.3V
DDA33
DD18
V
V
Table 7.1 DC Electrical Characteristics
PARAMETERSYMBOLMINTYPMAXUNITSCOMMENTS
I, IS Type Input Buffer
Low Input Level
V
ILI
0.8
V
TTL Levels
High Input Level
Input Leakage
Hysteresis (‘IS’ Only)
Input Buffer with Pull-Up
(IPU)
Low Input Level
High Input Level
Low Input Leakage
High Input Leakage
Input Buffer with Pull-Down
IPD
Low Input Level
High Input Level
Low Input Leakage
High Input Leakage
V
V
IHI
I
IL
HYSI
V
ILI
V
IHI
I
ILL
I
IHL
V
ILI
V
IHI
I
ILL
I
IHL
2.0
-10
250300
2.0
+26
-10
2.0
+10
-22
+10
350
0.8
+72
+10
0.8
-10
-82
V
uA
mV
V
V
uA
uA
V
V
uA
uA
= 0 to V
V
IN
TTL Levels
= 0
V
IN
= V
V
IN
DD33
TTL Levels
= 0
V
IN
= V
V
IN
DD33
DD33
Revision 2.3 (08-27-07)40SMSC USB2507
DATASHEET
Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
T able 7.1 DC Electrical Characteristics (continued)
The SMSC Hub conforms to all voltage, power, and timing characteristics and specifications as set
forth in the SMBus 1.0 Specification for Slave-Only devices (except as noted in Section 5.3).
8.1.2I2C EEPROM:
Frequency is fixed at 59KHz ± 20%.
8.1.3USB 2.0
The Hub conforms to all voltage, power, and timing characteristics and specifications as set forth in
the USB 2.0 Specification. Please refer to the USB Specification for more information.
SMSC USB250743Revision 2.3 (08-27-07)
DATASHEET
Chapter 9 Package Outline
Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
Figure 9.1 80 Pin TQFP Package Outline (12x12x1.4 mm body - 2 mm footprint)
Table 9.1 80 Pin TQFP Package Parameters
MINNOMINALMAXREMARKS
A1.40~1.60Overall Package Height
A10.05~0.15Standoff
A21.351.401.45Bod y Thickness
D13.8014.0014.20X Span
D111.8012.0012.20X body Size
E13.8014.0014.20Y Span
E111.8012.0012.20Y body Size
2. Tolerance on the true position of the leads is ± 0.04 mm maximum.
3. Package body dimensions D1 and E1 do not include the mold protrusion.
Maximum mold protrusion is 0.25 mm per side. D1 and E1 dimensions determined at datum pla ne
H.
4. Dimension for foot length L measured at the gauge plane 0.25 mm above the seating plane.
~7
o
Lead Foot Angle
5. Details of pin 1 identifier are optional but must be located within the zone indicated.
Revision 2.3 (08-27-07)44SMSC USB2507
DATASHEET
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