Microchip Technology USB2507 User Manual
Integrated USB 2.0 Compatible 7-Port Hub
Highlights
• Integrated USB 2.0 Compatible 7-Port Hub
- 7 Transaction Translators for highest performance
- High-Speed (480Mbits/s), Full-Speed
(12Mbits/s) and Low-Speed (1.5Mbits/s)
compatible
- Full power management with per port or
ganged, selectable power control
- Detects Bus-Power/Self-Power source and
changes mode automatically
• Complete USB Specification 2.0 Compatibility
- Includes USB 2.0 Transceivers
• VID/PID/DID, and Port Configuration for Hub via:
- Single Serial I
- SMBus Slave Port
• Default VID/PID/DID, allows functionality when
configuration EEPROM is absent
• Hardware Strapping options allow for configuration without an external EEPROM or SMBus Host
• On-Board 24MHz Crystal Driver Circuit or 24 MHz
external clock driver
• Internal PLL for 480MHz USB 2.0 Sampling
• Internal 1.8V Linear Voltage Regulator
• Integrated USB termination and Pull-up/Pull-down
resistors
• Internal Short Circuit protection of USB differential
signal pins
• 1.8 Volt Low Power Core Operation
• 3.3 Volt I/O with 5V Input T olerance
• 80-Pin TQFP RoHS compliant package
2
C EEPROM
USB2507
2007 - 2016 Microchip Technology Inc. DS000002251A-page 1
USB2507
TO OUR VALUED CUSTOMERS
It is our intention to provide our valued customers with the best documentation possible to ensure successful use of your Microchip
products. To this end, we will continue to improve our publications to better suit your needs. Our publications will be refined and
enhanced as new volumes and updates are introduced.
If you have any questions or comments regarding this publication, please contact the Marketing Communications Department via
E-mail at docerrors@microchip.com. We welcome your feedback.
Most Current Data Sheet
To obtain the most up-to-date version of this data sheet, please register at our Worldwide Web site at:
http://www.microchip.com
You can determine the version of a data sheet by examining its literature number found on the bottom outside corner of any page.
The last character of the literature number is the version number, (e.g., DS30000000A is version A of document DS30000000).
Errata
An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for current devices. As device/documentation issues become known to us, we will publish an errata sheet. The errata will specify the
revision of silicon and revision of document to which it applies.
To determine if an errata sheet exists for a particular device, please check with one of the following:
• Microchip’s Worldwide Web site; http://www.microchip.com
• Your local Microchip sales office (see last page)
When contacting a sales office, please specify which device, revision of silicon and data sheet (include -literature number) you are
using.
Customer Notification System
Register on our web site at www.microchip.com to receive the most current information on all of our products.
DS000002251A-page 2 2007 - 2016 Microchip Technology Inc.
USB2507
Table of Contents
1.0 Introduction ..................................................................................................................................................................................... 4
2.0 Pin Table 7-Port .............................................................................................................................................................................. 5
3.0 Pin Configuration 7-Port Hub .......................................................................................................................................................... 6
4.0 7-Port Hub Block Diagram .............................................................................................................................................................. 7
5.0 Functional Block Description ......................................................................................................................................................... 12
6.0 XNOR Test .................................................................................................................................................................................... 30
7.0 DC Parameters ............................................................................................................................................................................. 31
8.0 AC Specifications .......................................................................................................................................................................... 35
9.0 Package Outline ............................................................................................................................................................................ 36
Appendix A: Data Sheet Revision History ........................................................................................................................................... 37
The Microchip Web Site ...................................................................................................................................................................... 38
Customer Change Notification Service ............................................................................................................................................... 38
Customer Support ............................................................................................................................................................................... 38
Product Identification System ............................................................................................................................................................. 40
2007 - 2016 Microchip Technology Inc. DS000002251A-page 3
USB2507
1.0 INTRODUCTION
The Microchip 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.
The Hub works with an external USB power distribution switch device to control V
and to limit current and sense over-current conditions.
All required resistors on the USB ports are integrated into the Hub. This includes all series termination resistors on D+
and D– pins and all required pull-down and pull-up resistor s on D+ a nd D– pi ns. The over-curren t sense in puts 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 u pstream port, and the do wnstream facing ports will be called the downstream ports.
1.1 OEM 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 a ll configuration data bit fields (the hub will
attach to the host 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 operates as a Bus-Powered device if a local power source is not
available and switches to Self-Powered operation when a local power source is available).
• Optional OEM configuration via I
SMBus Host.
• LED indicator support.
• Compound device support (port is permanently hardwired to a downstream USB peripheral device).
• Hardware strapping options enable configuration of the following features.
- 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
2
C EEPROM or via the industry standard SMBus interface from an external
switching to downstream ports,
BUS
DS000002251A-page 4 2007 - 2016 Microchip Technology Inc.
2.0 PIN TABLE 7-PORT
TABLE 2-1: 7-PORT PIN TABLE
UPSTREAM USB 2.0 INTERFACE (3 PINS)
USBDP0 USBDN0 VBUS_DET
7-PORT USB 2.0 INTERFACE (44 PINS)
USBDP1 USBDN1 USBDP2 USBDN2
USBDP3 USBDN3 USBDP4 USBDN4
USBDP5 USBDN5 USBDP6 USBDN6
USBDP7 USBDN7
GR1/
NON_REM0
GR5 GR6 GR7
AM1/
GANG_EN
AM5 AM6 AM7
PRTPWR1 PRTPWR2 PRTPWR3 PRTPWR4
PRTPWR5 PRTPWR6 PRTPWR7
OCS1_N OCS2_N OCS3_N OCS4_N
OCS5_N OCS6_N OCS7_N
PRTPWR_POL RBIAS
SDA/SMBDATA SCL/SMBCLK/
XTAL1/CLKIN XTAL2 RESET_N SELF_PWR
ATEST/
REG_EN
NON_REM1
CFG_SEL0
CLKIN_EN TEST1 TEST0
GR2/
AM2/
MTT_EN
SERIAL PORT INTERFACE (3 PINS)
MISC (8 PINS)
POWER, GROUND (22 PINS)
GR3/
PRT_DIS0
AM3 AM4/
CFG_SEL1
USB2507
GR4/
PRT_DIS1
LED_EN
2007 - 2016 Microchip Technology Inc. DS000002251A-page 5
USB2507
USBDP0
VDDA33
USBDN0
VSS
USBDN1
USBDP1
VDDA33
USBDP2
USBDN2
GR7
PRTPWR1
AM7
GR6
GR5
AM6
AM5
VDD18
VSS
USB2507
61
80
40
21
20
60
41
VSS
VSS
VDD18
VDD33
GR4/PRT_DIS1
AM4/LED_EN
VSS
1
XTAL2
XTAL1/CLKIN
VDDA18PLL
GR3/PRT_DIS0
AM3
GR2/NON_REM1
AM2/MTT_EN
VDDA33PLL
ATEST/REG_EN
RBIAS
VSS
GR1/NON_REM0
AM1/GANG_EN
SDA/SMBDATA
SCL/SMBCLK/CFG_SEL0
TEST0
PRTPWR_POL
RESET_N
VBUS_DET
PRTPWR7
OCS7_N
CLKIN_EN
OCS5_N
PRTPWR6
OCS6_N
VSS
VDD18
VDD33CR
PRTPWR4
OCS4_N
PRTPWR5
OCS2_N
PRTPWR3
OCS3_N
OCS1_N
PRTPWR2
TEST1
SELF_PWR
CFG_SEL1
VDDA33
USBDP7
USBDN7
VSS
USBDN5
VSS
USBDN6
USBDP6
USBDN4
USBDP4
VDDA33
USBDP5
VDDA33
USBDP3
USBDN3
VSS
3.0 PIN CONFIGURATION 7-PORT HUB
FIGURE 3-1: 7-PORT 80-PIN TQFP
DS000002251A-page 6 2007 - 2016 Microchip Technology Inc.
4.0 7-PORT HUB BLOCK DIAGRAM
Upstream
V
BUS
Upstream
PHY
Upstream
USB Data
Repeater
Controller
SIE
Serial
Interface
PLL
24 MHz
Crystal
To
EEPROM
or SMBus
Master
Routing Logic
SCLSD
TT#1TT
#2
...
TT
#7
Port
Controller
Downstream
PHY #1
Port #1
OC Sense
Switch Driver
LED Drivers
Downstream
PHY #7
Port #7
OC Sense
Switch Driver
LED Drivers
...
Downstream
USB DataOCSense
Switch/LED
Drivers
Downstream
USB DataOCSense
Switch/LED
Drivers
V
BUS
Power
Detect
Pin
Strapping
Options
Internal
Defaults
Select
3.3V
1.8V
Reg.
1.8V
Cap
FIGURE 4-1: 7-PORT BLOCK DIAGRAM
USB2507
TABLE 4-1: 7-PORT HUB PIN DESCRIPTIONS
USB Bus Data USBDN0
Detect Upstream
Name Symbol Type Function
VBUS Power
USBDP0
UPSTREAM USB 2.0 INTERFACE
VBUS_DET I/O12 Detects state of Upstream VBUS power. The Microchip Hub
IO-U These pins connect to the u pstream USB bus data signals.
monitors VBUS_DET to determine when to assert the internal
D+ pull-up resistor (signaling 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).
2007 - 2016 Microchip Technology Inc. DS000002251A-page 7
USB2507
TABLE 4-1: 7-PORT HUB PIN DESCRIPTIONS (CONTINUED)
Name Symbol Type Function
7-PORT USB 2.0 HUB INTERFACE
High-Speed USB
Data
USB Power Enable PRTPWR[7:1] O12 Enables power to USB peripheral devices (downstream).
Ports [7:5] Green
LED
Port 4:3 Green
LED
&
Port Disable
strapping option.
USBDN[7:1]
USBDP[7:1]
GR[7:5] I/O12 Green i ndicator LED’s for ports[7:5]. LED is active low
GR[4:3]/
PRT_DIS[1:0]
IO-U These pins connect to the d ownstream USB peripheral
devices attached to the Hub’s ports.
The active signal level of the PRTPWR7:1 pins is determined
by the Power Polarity Strapping function of the
PRTPWR_POL pin.
I/O12 Green indicato r 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.
Port [2:1] Green
LED
&
Port Non-
Removable
strapping option.
GR[2:1]/
NON_REM[1:0]
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.
PRT_DIS[1:0] = ‘11’, Ports 7, 6 & 5 are disabled,
GR4 is active low,
GR3 is active low.
I/O12 Green indicato r 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.
Ports [7:5] Amber
LED
DS000002251A-page 8 2007 - 2016 Microchip Technology Inc.
AM[7:5] I/O12 Amber indicator LED’s for ports [7:5], LED is active low.
USB2507
TABLE 4-1: 7-PORT HUB PIN DESCRIPTIONS (CONTINUED)
Name Symbol Type Function
Port 4 Amber LED
&
LED Enable
strapping option
Port 3 Amber LED AM3 I/O12 Amber indicator LED for po rt 3. Signal will be active low.
Port 2 Amber LED
&
MTT Disable
Port 1 Amber LED
&
Gang Power
Switching and
Current Sensing
strapping option.
AM4/
LED_EN
AM2/
MTT_EN
AM1/
GANG_EN
I/O12 Amber 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.
I/O12 Amber 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.
I/O12 Amber 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_POL I/O12 Port Power Polarity strapping determinatio n 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 logic 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_N IPU Input from external current monitor indicating an over-current
condition. {Note: Contains internal pull-up to 3.3V supply}
RBIAS I-R A 12.0k (resistor is attached from ground to this pin
to set the transceiver’s internal bias settings.
2007 - 2016 Microchip Technology Inc. DS000002251A-page 9
USB2507
TABLE 4-1: 7-PORT HUB PIN DESCRIPTIONS (CONTINUED)
Name Symbol Type Function
SERIAL PORT INTERFACE
Serial Data/SMB
Data
Serial Clock/SMB
Clock
&
Config Select 0
Configuration
Programming
Select
TABLE 4-2: SMBUS OR EEPROM INTERFACE BEHAVIOR
SDA/SMBDATA IOSD12 (Serial Data)/(SMB Data) signal.
SCL/SMBCLK/
CFG_SEL0
CFG_SEL1 I This multifunction pin is read on the rising edge of RESET_N
CFG_SEL1 CFG_SEL0 SMBus or EEPROM Interface Behavior
00Reserved
0 1 Configured as an SMBus slave for external download of user-
1 0 Internal Default Configuration via strapping options.
1 1 2-wire (I
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 determine
the hub configuration method as described in Table 4-2.
(see the applicable RESET_N timing table in Section 5.6.1)
and will determine the hub configuration method as described
in Table 4-2.
defined descriptors. SMBus slave address is 0101100
2
C) EEPROMS are supported,
TABLE 4-3: MISCELLANEOUS PINS
Name Symbol Type Function
Crystal
Input/External
Clock Input
Crystal Output XTAL2 OCLKx 24MHz Crystal
Clock Input
Enable
RESET Input RESET_N IS This active low signal is used by the system to reset the
Self-Power /
Bus-Power
Detect
TEST Pins TEST[1:0] IPD Used for testing the chip. User must treat as a no-connect
Analog Test
&
Internal 1.8V
voltage regulator
enable
XTAL1/
CLKIN
CLKIN_EN I Clock In Enable:
SELF_PWR I Detects availability of local self-power source.
ATEST/
REG_EN
ICLKx 24MHz 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.
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.
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.
chip. The minimum active low pulse is 1us.
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.
or connect to ground.
AIO This signal is used for testing the analog section of th e
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.
DS000002251A-page 10 2007 - 2016 Microchip Technology Inc.
USB2507
TABLE 4-4: POWER, GROUND, AND NO CONNECT
Name Symbol Type Function
VDDCORE3P3 VDD33CR +3.3V I/O Power.
If the internal core 1.8V regulator is enabled, then this pin
acts as the regulator input
VDD1P8 VDD18 +1.8V core power.
If the internal regulator is enabled, then VDD18 pin 50
must have a 4.7F (or greater) ±20% (ESR <0.1
capacitor to VSS
VDDAPLL3P3 VDDA33PLL +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
VDDAPLL1P8 VDDA18PLL +1.8V Filtered analog power for internal PLL.
If the internal regulator is enabled, then this pin must have
a 4.7F (or greater) ±20% (ESR <0.1capacitor to VSS
VDDIO3P3 VDD33 +3.3V I/O power.
VDDA3P3 VDDA33 +3.3V Filtered analog power.
VSS VSS Ground.
TABLE 4-5: BUFFER TYPE DESCRIPTIONS
Buffer Description
I Input.
IPD Input, with a weak Internal pull-down.
IPU Input, with a weak Internal pull-up.
IS Input with Schmitt trigger.
O12 Output 12mA.
I/O12 Input/Output, 12mA
IOSD12 Open drain….12mA sink with Schmitt trigger, and must meet I2C-Bus
ICLKx XTAL Clock Input
OCLKx XTAL Clock Output
I-R RBIAS
IO-U Defined in USB Specification.
AIO Analog Input/output. Per PHY test requirements.
Specification Version 2.1 requirements.
Note: Meets USB 1.1 requirements when operating as a 1.1-compliant
device and meets USB 2.0 requirements when operating as a 2.0compliant device.
2007 - 2016 Microchip Technology Inc. DS000002251A-page 11
USB2507
5.0 FUNCTIONAL BLOCK DESCRIPTION
5.1 7-Port Hub
Microchip’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-periodic buffers per TT.
5.1.1 HUB CONFIGURATION OPTIONS
The Microchip Hub supports a large numb er of features and must be configured in order to correctly function when
attached to a USB host controller. There are three princip al 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.
5.1.1.1 Vendor 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, Microchip’s VID (see Table 5-1) will be reported.
5.1.1.2 Product 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, Microchip’s PID designation of (see Table 5-1) will be reported.
5.1.1.3 Device 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, Microchip’s DID designation of (see Table 5-1)
will be reported.
5.1.1.4 Self-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 Mi crochip Hub consumes less than 100mA o f current prior to being
configured. After configuration, the Bus-Powered Microchip 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.
5.1.1.5 Port 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.
5.1.1.6 High-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.
DS000002251A-page 12 2007 - 2016 Microchip Technology Inc.
USB2507
5.1.1.7 Multiple-TT Support
Selects between a mode where only one transaction translator is available 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.
5.1.1.8 EOP 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.
5.1.1.9 Current 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 determines if current sensing will be ganged, or none (ganged if self-powered, none if buspowered).
5.1.1.10 Downstream Port Power Enabling
Enables all ports simultaneously (ganged), or port power is individually switched on and off on a port-by-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 configure the hub for ganged or individual port-by-port port power switching.
5.1.1.11 Compound 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 defined 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 automatically causes the hub controller
to report that it is part of a compound device.
5.1.1.12 Non-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 non-removable.
5.1.1.13 Self-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.
5.1.1.14 Bus-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 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.
5.1.1.15 Dynamic Power
Controls the ability of the 7-Port Hub to automatically change from Self-Po wered operation to Bus-Powered operation
if the local power source is removed or is unavailable (and from Bus-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.}
2007 - 2016 Microchip Technology Inc. DS000002251A-page 13
Loading...