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INTEGRATED CIRCUITS
PDIUSBH11
Universal Serial Bus Hub
Product specification |
1997 Aug 01 |
Supersedes data of 1997 Apr 17 |
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m n r
Philips Semiconductors |
Product specification |
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Universal Serial Bus Hub |
PDIUSBH11 |
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FEATURES
•Complies with the Universal Serial Bus specification Rev. 1.0
•Four downstream ports with per packet connectivity
•Embedded function with two endpoints (control and interrupt)
•Integrated FIFO memory for hub and embedded function
•Automatic protocol handling
•Versatile I2C interface
•Allows software control of monitor
•Compliant with USB Human Interface and Display Device Class
•Single 3.3V supply with 5V tolerant I/O
ORDERING INFORMATION
DESCRIPTION
The Philips Semiconductors PDIUSBH11 is a compound USB hub
IC (hub plus embedded function).
It is used in a microcontroller based system and communicates with the system microcontroller over the I2C serial bus. This modular approach to implementing a hub and embedded function allows the designer to maintain the system microcontroller of choice and retain existing architecture. This cuts down development time and offers the most cost-effective solution.
Ideal applications for the IC include computer monitors and keyboards.
The PDIUSBH11 conforms to the USB specification 1.0 and I2C serial interface specification. It is also compliant with the USB
Human Input Device and Monitor Control Class specifications.
The embedded function of the PDIUSBH11 appears as PORT1 to the host system and the four downstream ports are numbered 2 through 5.
PACKAGES |
TEMPERATURE RANGE |
OUTSIDE NORTH AMERICA |
NORTH AMERICA |
PKG. DWG. # |
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32-pin plastic SO |
0°C to +70°C |
PDIUSBH11 D |
PDIUSBH11 D |
SOT287-1 |
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32-pin plastic SDIP |
0°C to +70°C |
PDIUSBH11 NB |
PDIUSBH11 NB |
SOT232-1 |
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BLOCK DIAGRAM
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UPSTREAM |
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PORT |
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48 MHz |
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D+ |
D± |
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INTEGRATED |
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RAM |
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BIT CLOCK |
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ANALOG |
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RECOVERY |
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TX/RX |
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FULL SPEED |
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PHILIPS |
MEMORY |
I2C |
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MANAGEMENT |
SLAVE |
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SIE |
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UNIT |
INTERFACE |
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HUB |
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END OF |
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FRAME |
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REPEATER |
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TIMERS |
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GENERAL |
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PORT |
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CONTROLLER |
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ANALOG |
PORT |
ANALOG |
PORT |
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ANALOG |
PORT |
ANALOG |
PORT |
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TX/RX |
CONTROL |
TX/RX |
CONTROL |
TX/RX |
CONTROL |
TX/RX |
CONTROL |
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D+ |
D± |
LED |
D+ |
D± |
LED |
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D+ |
D± |
LED |
D+ |
D± |
LED |
INTERRUPT |
SDA SCL |
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ENABLE |
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ENABLE |
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ENABLE |
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ENABLE |
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DOWNSTREAM |
DOWNSTREAM |
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DOWNSTREAM |
DOWNSTREAM |
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PORT 2 |
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PORT 3 |
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PORT 4 |
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PORT 5 |
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SV00226 |
NOTE:
1. This is a conceptual block diagram and does not include each individual signal.
1997 Aug 01 |
2 |
853±1968 18238 |
Philips Semiconductors |
Product specification |
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Universal Serial Bus Hub |
PDIUSBH11 |
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Analog Transceivers
These transceivers interface directly to the USB cables through some termination resistors. They are capable of transmitting and
receiving serial data at both ªfull speedº (12 Mbit/s) and ªlow speedº (1.5 Mbit/s) data rates.
Hub Repeater
The hub repeater is responsible for managing connectivity on a per packet basis. It implements packet signaling connectivity and resume connectivity.
Low speed devices can be connected to downstream ports since the repeater will not propagate upstream packets to downstream ports, to which low speed devices are connected, unless they are preceded by a PREAMBLE PID.
End of Frame Timers
This block contains the specified EOF1 and EOF2 timers which are used to detect loss-of-activity and babble error conditions in the hub repeater. The timers also maintain the low-speed keep-alive strobe which is sent at the beginning of a frame.
General and Individual Port Controller
The general and individual port controllers together provide status and control of individual downstream ports. Via the I2C-interface a microcontroller can access the downstream ports and request or change the status of each individual port.
Any change in the status or settings of the individual port will result in an interrupt request. Via an interrupt register, the servicing microcontroller can look up the downstream port which generated
the interrupt and request its new status. Any port status change can then be reported to the host via the hub status change (interrupt) endpoint.
Bit Clock Recovery
The bit clock recovery circuit recovers the clock from the incoming USB data stream using (4X) over-sampling principle. It is able to track jitter and frequency drift specified by the USB spec.
Philips Serial Interface Engine (PSIE)
The Philips SIE implements the full USB protocol layer. It is completely hardwired for speed and needs no firmware intervention. The functions of this block include: synchronization pattern recognition, parallel / serial conversion, bit stuffing / destuffing, CRC checking / generation, PID verification / generation, address recognition, handshake evaluation / generation.
Memory Management Unit (MMU) and Integrated RAM
The MMU and the integrated RAM is used to handle the large difference in data-rate between USB, running in burst of 12 Mbit/s and the I2C interface to the microcontroller, running at 100 kbit/s.
This allows the microcontroller to read and write USB packets at its own (low) speed through I2C.
I2C Slave Interface
This block implements the necessary I2C interface protocol. A slave I2C allows for simple micro-coding. An interrupt is used to alert the microcontroller whenever the PDIUSBH11 needs attention. As a slave I2C device, the PDIUSBH11 I2C clock: SCL is an input and is controlled by the microcontroller.
ENDPOINT DESCRIPTIONS
The following table summarizes the endpoints supported by the PDIUSBH11.
FUNCTION |
ENDPOINT |
ENDPOINT TYPE |
TRANSFER TYPE |
DIRECTION |
MAXIMUM PACKET SIZE |
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NUMBER |
(bytes) |
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HUB |
0 |
Default |
Control |
IN, OUT |
8 |
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1 |
Status change |
Interrupt |
IN |
1 |
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EMBEDDED |
0 |
Default |
Control |
IN, OUT |
8 |
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1 |
Interrupt |
Interrupt |
IN |
8 |
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PIN DESCRIPTION
The PDIUSBH11 has two modes of operation. The first mode (Mode 0) enables the pins DNx_EN_N to power a LED indicating the port is enabled. The second mode (Mode 1) utilizes the LED enable pins as per port overcurrent condition pins.
The voltage level at power up on the TEST1 and TEST2 pins determine the PDIUSBH11 mode of operation. When both of the pins are connected to Ground, Mode 0 is enabled. When pins TEST1 and TEST2 are connected to Vcc, Mode 1 is enabled. Note that in Mode 1 the pin DN2_EN_N remains an LED enable pin. Pin
TEST3 should always be connected to Ground at all times.
1997 Aug 01 |
3 |
Philips Semiconductors |
Product specification |
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Universal Serial Bus Hub |
PDIUSBH11 |
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PIN DESCRIPTION (MODE 0)
PIN NO |
PIN SYMBOL |
I/O |
DRIVE |
NAME AND FUNCTION |
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1 |
TEST1 |
I |
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Connect to Ground |
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2 |
TEST2 |
I |
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Connect to Ground |
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3 |
TEST3 |
I |
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Connect to Ground |
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4 |
RESET_N |
I |
ST |
Power-on reset |
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5 |
GND |
POWER |
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Ground reference |
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6 |
XTAL1 |
I/O |
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Crystal connection 1 (48MHz) |
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7 |
XTAL2 |
I/O |
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Crystal connection 2 (48MHz) |
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8 |
CLK12MHZ |
O |
2mA |
12MHz output clock for external devices |
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9 |
VCC |
POWER |
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Voltage supply 3.3V 0.3V |
10 |
OCURRENT_N |
I |
ST |
Over-current notice to the device |
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11 |
SWITCH_N |
O |
OD8 |
Enables power to downstream ports |
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12 |
SUSPEND |
O |
4mA |
Device is in suspended state |
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13 |
DN2_EN_N |
O |
OD8 |
Downstream port 2 LED enable indicator |
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14 |
DN3_EN_N |
O |
OD8 |
Downstream port 3 LED enable indicator |
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15 |
DN4_EN_N |
O |
OD8 |
Downstream port 4 LED enable indicator |
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16 |
DN5_EN_N |
O |
OD8 |
Downstream port 5 LED enable indicator |
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17 |
INT_N |
O |
OD4 |
Connect to microcontroller interrupt |
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18 |
SDA |
I/O |
OD4 |
I2C bi-directional data |
19 |
SCL |
I/O |
OD4 |
I2C bit-clock |
20 |
GND |
POWER |
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Ground reference |
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21 |
DN5_DP |
AI/O |
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Downstream port 5 D+ connection |
22 |
DN5_DM |
AI/O |
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Downstream port 5 D± connection |
23 |
DN4_DP |
AI/O |
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Downstream port 4 D+ connection |
24 |
DN4_DM |
AI/O |
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Downstream port 4 D± connection |
25 |
DN3_DP |
AI/O |
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Downstream port 3 D+ connection |
26 |
DN3_DM |
AI/O |
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Downstream port 3 D± connection |
27 |
DN2_DP |
AI/O |
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Downstream port 2 D+ connection |
28 |
DN2_DM |
AI/O |
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Downstream port 2 D- connection |
29 |
AGND |
POWER |
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Analog Ground reference |
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30 |
AVCC |
POWER |
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Analog voltage supply 3.3V 0.3V |
31 |
UP_DP |
AI/O |
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Upstream D+ connection |
32 |
UP_DM |
AI/O |
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Upstream D- connection |
1997 Aug 01 |
4 |
Philips Semiconductors |
Product specification |
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Universal Serial Bus Hub |
PDIUSBH11 |
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PIN DESCRIPTION (MODE 1)
PIN NO |
PIN SYMBOL |
I/O |
DRIVE |
NAME AND FUNCTION |
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1 |
TEST1 |
I |
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Connect to VCC |
2 |
TEST2 |
I |
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Connect to VCC |
3 |
TEST3 |
I |
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Connect to Ground |
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4 |
RESET_N |
I |
ST |
Power-on reset |
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5 |
GND |
POWER |
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Ground reference |
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6 |
XTAL1 |
I/O |
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Crystal connection 1 (48MHz) |
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7 |
XTAL2 |
I/O |
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Crystal connection 2 (48MHz) |
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8 |
CLK12MHZ |
O |
2mA |
12MHz output clock for external devices |
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9 |
VCC |
POWER |
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Voltage supply 3.3V 0.3V |
10 |
OCURRENT2_N |
I |
ST |
Downstream port 2 over-current notice |
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11 |
SWITCH_N |
O |
OD8 |
Enables power to downstream ports |
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12 |
SUSPEND |
O |
4mA |
Device is in suspended state |
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13 |
DN2_EN_N |
O |
OD8 |
Downstream port 2 LED enable indicator |
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14 |
OCURRENT3_N |
I |
ST |
Downstream port 3 over-current notice |
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15 |
OCURRENT4_N |
I |
ST |
Downstream port 4 over-current notice |
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16 |
OCURRENT5_N |
I |
ST |
Downstream port 5 over-current notice |
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17 |
INT_N |
O |
OD4 |
Connect to microcontroller interrupt |
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18 |
SDA |
I/O |
OD4 |
I2C bi-directional data |
19 |
SCL |
I/O |
OD4 |
I2C bit-clock |
20 |
GND |
POWER |
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Ground reference |
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21 |
DN5_DP |
AI/O |
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Downstream port 5 D+ connection |
22 |
DN5_DM |
AI/O |
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Downstream port 5 D± connection |
23 |
DN4_DP |
AI/O |
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Downstream port 4 D+ connection |
24 |
DN4_DM |
AI/O |
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Downstream port 4 D- connection |
25 |
DN3_DP |
AI/O |
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Downstream port 3 D+ connection |
26 |
DN3_DM |
AI/O |
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Downstream port 3 D- connection |
27 |
DN2_DP |
AI/O |
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Downstream port 2 D+ connection |
28 |
DN2_DM |
AI/O |
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Downstream port 2 D- connection |
29 |
AGND |
POWER |
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Analog Ground reference |
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30 |
AVCC |
POWER |
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Analog voltage supply 3.3V 0.3V |
31 |
UP_DP |
AI/O |
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Upstream D+ connection |
32 |
UP_DM |
AI/O |
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Upstream D- connection |
NOTES:
1.Signals ending in _N indicate active low signals. ST: Schmitt Trigger
OD4, OD8: Open Drain with 4 or 8 mA drive AI/O: Analog I/O
1997 Aug 01 |
5 |
Philips Semiconductors |
Product specification |
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Universal Serial Bus Hub |
PDIUSBH11 |
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APPLICATION DIAGRAM
USB
3.3V |
UPSTREAM |
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48MHz |
12MHz |
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I2C |
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H11 |
μC |
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USB |
5V |
DOWNSTREAM |
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POWER SWITCH |
SWITCHED |
AND |
5V |
OVERCURRENT CIRCUIT |
ENABLE LED |
SV00227
I2C Interface. |
Protocol |
The I2C bus is used to interface to an external microcontroller needed to control the operation of the hub. For cost consideration, the target system microcontroller can be shared and utilized for this purpose. The PDIUSBH11 implements a slave I2C interface. When the PDIUSBH11 needs to communicate with the microcontroller it asserts an interrupt signal. The microcontroller services this interrupt by reading the appropriate status register on the
PDIUSBH11 through the I2C bus. (For more information about the I2C serial bus, refer to the I2C handbook, Philips order number 9397 750 00013).
The I2C interface on the PDIUSBH11 defines two types of transactions :
1.command transaction
A command transaction is used to define which data (e.g., status byte, buffer data, ...) will be read from / written to the USB interface in the next data transaction. A data transaction usually follows a command transaction.
2.data transaction
A data transaction reads data from / writes data to the USB interface. The meaning of the data is dependent on the command transaction which was sent before the data transaction.
Two addresses are used to differentiate between command and data transactions. Writing to the command address is interpreted as a command, while reading from / writing to the data address is used to transfer data between the PDIUSBH11 and the controller.
An I2C transaction starts with a `Start Condition', followed by an address. When the address matches either the command or data address the transaction starts and runs until a `Stop Condition' or another `Start Condition' (repeated start) occurs.
The command address is write-only and is unable to do a read. The next bytes in the message are interpreted as commands. Several command bytes can be sent after one command address. Each of the command bytes is acknowledged and passed on to the Memory
Management Unit inside the PDIUSBH11.
When the start condition address matches the data address, the next bytes are interpreted as data. When the RW bit in the address indicates a `master writes data to slave' (=`0') the bytes are received, acknowledged and passed on to the Memory Management Unit. If the RW bit in the address indicates a `master reads data from slave' (=`1') the PDIUSBH11 will send data to the master. The I2C-master must acknowledge all data bytes except the last one. In this way the
I2C interface knows when the last byte has been transmitted and it then releases the SDA line so that the master controller can generate the STOP condition.
Repeated start support allows another packet to be sent without generating a Stop Condition.
Timing
When the master writes data to the PDIUSBH11, the data is sampled 1 micro-second after the rising edge of SCL. When the PDIUSBH11 writes data to the master, the data is driven 1 micro-second after the falling edge of SCL.
ADDRESS TABLE
TYPE OF ADDRESS |
PHYSICAL ADDRESS |
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(MSB to LSB) |
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Command |
0011 011 (binary) |
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Data |
0011 010 (binary) |
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1997 Aug 01 |
6 |
Philips Semiconductors |
Product specification |
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Universal Serial Bus Hub |
PDIUSBH11 |
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COMMAND SUMMARY
Some commands have the same command code (e.g., Read Buffer and Write Buffer). In these cases, the direction of the Data Phase (read or write) indicates which command is executed.
COMMAND NAME |
RECIPIENT |
CODING |
DATA PHASE |
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Initialization Commands |
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Set Address / Enable |
Hub |
D0h |
Write 1 byte |
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Embedded Function |
D1h |
Write 1 byte |
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Set Endpoint Enable |
Hub + Embedded Function |
D8h |
Write 1 byte |
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Data Flow Commands |
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Read Interrupt Register |
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F4h |
Read 1 byte |
Select Endpoint |
Hub Control OUT |
00h |
Read 1 byte (optional) |
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Hub Control IN |
01h |
Read 1 byte (optional) |
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Embedded Function Control OUT |
02h |
Read 1 byte (optional) |
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Embedded Function Control IN |
03h |
Read 1 byte (optional) |
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Embedded Function Interrupt |
04h |
Read 1 byte (optional) |
Read Last Transaction Status |
Hub Control OUT |
40h |
Read 1 byte |
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Hub Control IN |
41h |
Read 1 byte |
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Embedded Function Control OUT |
42h |
Read 1 byte |
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Embedded Function Control IN |
43h |
Read 1 byte |
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Embedded Function Interrupt |
44h |
Read 1 byte |
Read Endpoint Status |
Hub Control OUT |
80h |
Read 1 byte |
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Hub Control IN |
81h |
Read 1 byte |
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Embedded Function Control OUT |
82h |
Read 1 byte |
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Embedded Function Control IN |
83h |
Read 1 byte |
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Embedded Function Interrupt |
84h |
Read 1 byte |
Read Buffer |
Selected Endpoint |
F0h |
Read n bytes |
Write Buffer |
Selected Endpoint |
F0h |
Write n bytes |
Set Endpoint Status |
Hub Control OUT |
40h |
Write 1 byte |
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Hub Control IN |
41h |
Write 1 byte |
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Embedded Function Control OUT |
42h |
Write 1 byte |
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Embedded Function Control IN |
43h |
Write 1 byte |
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Embedded Function Interrupt |
44h |
Write 1 byte |
Acknowledge Setup |
Selected Endpoint |
F1h |
None |
Clear Buffer |
Selected Endpoint |
F2h |
None |
Validate Buffer |
Selected Endpoint |
FAh |
None |
Hub Commands |
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Clear Port Feature |
Port 2 |
E0h |
Write 1 byte |
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Port 3 |
E1h |
Write 1 byte |
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Port 4 |
E2h |
Write 1 byte |
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Port 5 |
E3h |
Write 1 byte |
Set Port Feature |
Port 2 |
E8h |
Write 1 byte |
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Port 3 |
E9h |
Write 1 byte |
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Port 4 |
EAh |
Write 1 byte |
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Port 5 |
EBh |
Write 1 byte |
Get Port Status |
Port 2 |
E0h |
Read 1 or 2 bytes |
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Port 3 |
E1h |
Read 1 or 2 bytes |
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Port 4 |
E2h |
Read 1 or 2 bytes |
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Port 5 |
E3h |
Read 1 or 2 bytes |
Set Status Change Bits |
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F7h |
Write 1 byte |
General Commands |
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Send Resume |
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F6h |
None |
Read Current Frame Number |
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F5h |
Read 1 or 2 bytes |
1997 Aug 01 |
7 |
Philips Semiconductors |
Product specification |
|
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|
Universal Serial Bus Hub |
PDIUSBH11 |
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COMMAND DESCRIPTIONS
Command Procedure
There are four basic types of commands: Initialization, Data, Hub Specific and General commands. Respectively, these are used to initialize the hub and embedded function; for data flow between the hub, embedded function and the host; some hub specific commands for controlling individual downstream ports; and some general commands.
Initialization Commands
Initialization commands are used during the enumeration process of the USB network. These commands are used to enable the hub and embedded function endpoints. They are also used to set the USB assigned address.
Set Address / Enable
Command |
: D0h (Hub), D1h (Embedded Function) |
Data |
: Write 1 byte |
This command is used to set the USB assigned address and enable the hub or embedded function respectively. The hub always powers up disabled and should be enabled after a bus RESET.
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POWER ON VALUE |
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ADDRESS |
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ENABLE |
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ADDRESS |
THE VALUE WRITTEN BECOMES THE ADDRESS |
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ENABLE |
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A `1' ENABLES THIS FUNCTION |
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SV00385 |
Set Endpoint Enable |
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Command |
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: D8h |
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Data |
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: Write 1 byte |
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Interrupt endpoints can only be enabled when the hub/function is enabled via the Set Address/Enable command.
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POWER ON VALUE |
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HUB'S INTERRUPT ENDPOINT |
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FUNCTION'S INTERRUPT ENDPOINT |
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RESERVED |
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HUB'S INTERRUPT ENDPOINT |
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A VALUE OF `1' INDICATES THE HUB'S INTERRUPT ENDPOINT IS ENABLED. |
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FUNCTION'S INTERRUPT ENDPOINT |
A VALUE OF `1' INDICATES THE EMBEDDED FUNCTION'S INTERRUPT ENDPOINT IS ENABLED. |
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SV00387
1997 Aug 01 |
8 |
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