Philips PDIUSBH1 Service Manual
PDIUSBH11
Universal Serial Bus hub
Preliminary specification 1996 Nov 12
INTEGRATED CIRCUITS
Philips Semiconductors Preliminary specification
PDIUSBH11Universal Serial Bus hub
2
1996 Nov 12
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 I
2
C interface
•Compliant with USB Human Interface and Display Device Class
•Single 3.3V supply and SDIP32 package
DESCRIPTION
The Philips Semiconductors Universal Serial Bus (USB) hub is
designed to provide USB expandability in a PC system and
plug-and-play control of the embedded function, for example,
monitor. The PDIUSBH11 is used in a microcontroller based system
and communicates with the system microcontroller over the I
2
C
serial bus.
This modular approach to implementing a hub and embedded
function allows the designer to either use a low cost dedicated
microcontroller or adapt the existing system microcontroller. The
PDIUSBH11 conforms to the USB specification 1.0 and the I
2
C
serial interface specification.
Since the device is a compound USB device (hub function plus
embedded function), the embedded function appears as PORT1 to
the host system. The four expansion ports are numbered 2 through
5.
ORDERING INFORMATION
PACKAGES TEMPERATURE RANGE OUTSIDE NORTH AMERICA NORTH AMERICA PKG. DWG. #
32-pin plastic SO 0°C to +70°C PDIUSBH11 D PDIUSBH11 D SOT287–1
32-pin plastic SDIP 0°C to +70°C PDIUSBH11 NB PDIUSBH11 NB SOT232–1
BLOCK DIAGRAM
ANALOG
TX/R
X
PORT
CONTROL
ANALOG
TX/R
X
PORT
CONTROL
ANALOG
TX/R
X
PORT
CONTROL
ANALOG
TX/R
X
PORT
CONTROL
GENERAL
PORT
CONTROLLER
HUB
REPEATER
END OF
FRAME
TIMERS
ANALOG
T
X/RX
PHILIPS
SIE
INTEGRATED
RAM
BIT CLOCK
RECOVERY
MEMORY
MANAGEMENT
UNIT
I
2
C
SLAVE
INTERFACE
48 MHz
FULL SPEED
INTERRUPT SDA SCL
LED
ENABLE
D–D+
LED
ENABLE
D–D+
LED
ENABLE
D–D+
LED
ENABLE
D–D+
DOWNSTREAM
PORT 2
DOWNSTREAM
PORT 3
DOWNSTREAM
PORT 4
DOWNSTREAM
PORT 5
D+
D–
UPSTREAM
PORT
SV00226
NOTE:
1. This is a conceptual block diagram and does not include each individual signal.
Philips Semiconductors Preliminary specification
PDIUSBH11Universal Serial Bus hub
1996 Nov 12
3
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 “full speed” (12 Mbit/s) and “low speed”
(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 I
2
C–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: synchronisation 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 I
2
C 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 I
2
C.
I
2
C Slave Interface
This block implements the necessary I
2
C interface protocol. A slave
I
2
C allows for simple micro–coding. An interrupt is used to alert the
microcontroller whenever the PDIUSBH11 needs attention. As a
slave I
2
C device, the PDIUSBH11 I2C clock: SCL is an input and is
controlled by the microcontroller.
Philips Semiconductors Preliminary specification
PDIUSBH11Universal Serial Bus hub
1996 Nov 12
4
ENDPOINT DESCRIPTIONS
The following table summarizes the endpoints supported by the PDIUSBH11.
FUNCTION
ENDPOINT
NUMBER
ENDPOINT TYPE TRANSFER TYPE DIRECTION
MAXIMUM PACKET SIZE
(bytes)
0 Default Control IN, OUT 8
HUB
1 Status change Interrupt IN 1
0 Default Control IN, OUT 8
1 Interrupt Interrupt IN 8
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.
PIN DESCRIPTION (MODE 0)
PIN NO PIN SYMBOL I/O DRIVE NAME AND FUNCTION
1 TEST1 I Connect to Ground
2 TEST2 I Connect to Ground
3 TEST3 I Connect to Ground
4 RESET_N I ST Power-on reset
5 GND POWER Ground reference
6 XTAL1 I Crystal connection 1 (48MHz)
7 XTAL2 O Crystal connection 2 (48MHz)
8 CLK12MHZ O 2mA 12MHz output clock for external devices
9 V
CC
POWER Voltage supply 3.3V 0.3V
10 OCURRENT_N I ST Over-current notice to the device
11 SWITCH_N O OD8 Enables power to downstream ports
12 SUSPEND O 4mA Device is in suspended state
13 DN2_EN_N O OD8 Downstream port 2 LED enable indicator
14 DN3_EN_N O OD8 Downstream port 3 LED enable indicator
15 DN4_EN_N O OD8 Downstream port 4 LED enable indicator
16 DN5_EN_N O OD8 Downstream port 5 LED enable indicator
17 INT_N O OD4 Connect to microcontroller interrupt
18 SDA I/O OD4 I2C bi-directional data
19 SCL I/O OD4 I2C bit-clock
20 GND POWER Ground reference
21 DN5_DP AI/O Downstream port 5 D+ connection
22 DN5_DM AI/O Downstream port 5 D– connection
23 DN4_DP AI/O Downstream port 4 D+ connection
24 DN4_DM AI/O Downstream port 4 D– connection
25 DN3_DP AI/O Downstream port 3 D+ connection
26 DN3_DM AI/O Downstream port 3 D– connection
27 DN2_DP AI/O Downstream port 2 D+ connection
28 DN2_DM AI/O Downstream port 2 D– connection
29 AGND POWER Analog Ground reference
30 AV
CC
POWER Analog voltage supply 3.3V 0.3V
31 UP_DP AI/O Upstream D+ connection
32 UP_DM AI/O Upstream D– connection
EMBEDDED
Philips Semiconductors Preliminary specification
PDIUSBH11Universal Serial Bus hub
1996 Nov 12
5
PIN DESCRIPTION (MODE 1)
PIN NO PIN SYMBOL I/O DRIVE NAME AND FUNCTION
1 TEST1 I Connect to V
CC
2 TEST2 I Connect to V
CC
3 TEST3 I Connect to Ground
4 RESET_N I ST Power-on reset
5 GND POWER Ground reference
6 XTAL1 I Crystal connection 1 (48MHz)
7 XTAL2 O Crystal connection 2 (48MHz)
8 CLK12MHZ O 2mA 12MHz output clock for external devices
9 V
CC
POWER Voltage supply 3.3V 0.3V
10 OCURRENT2_N I ST Downstream port 2 over-current notice
11 SWITCH_N O OD8 Enables power to downstream ports
12 SUSPEND O 4mA Device is in suspended state
13 DN2_EN_N O OD8 Downstream port 2 LED enable indicator
14 OCURRENT3_N I ST Downstream port 3 over-current notice
15 OCURRENT4_N I ST Downstream port 4 over-current notice
16 OCURRENT5_N I ST Downstream port 5 over-current notice
17 INT_N O OD4 Connect to microcontroller interrupt
18 SDA I/O OD4 I2C bi-directional data
19 SCL I/O OD4 I2C bit-clock
20 GND POWER Ground reference
21 DN5_DP AI/O Downstream port 5 D+ connection
22 DN5_DM AI/O Downstream port 5 D– connection
23 DN4_DP AI/O Downstream port 4 D+ connection
24 DN4_DM AI/O Downstream port 4 D– connection
25 DN3_DP AI/O Downstream port 3 D+ connection
26 DN3_DM AI/O Downstream port 3 D– connection
27 DN2_DP AI/O Downstream port 2 D+ connection
28 DN2_DM AI/O Downstream port 2 D– connection
29 AGND POWER Analog Ground reference
30 AV
CC
POWER Analog voltage supply 3.3V 0.3V
31 UP_DP AI/O Upstream D+ connection
32 UP_DM AI/O 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
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