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11 Jan 1999

PDIUSBH11A / H12

Hub / Monitor Firmware

Application Notes

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PDIUSBH11A / H12 - Hub / Monitor Firmware Application Notes

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This document describes the programming features of the PDIUSBH11A. Examples of how to
program any C51-based micro-controller to control the hub and embedded function are provided in
the following sections:

•

Main control loop;

•

Hub control subroutine;

•

Embedded function control subroutine.

0 Introduction

Philips Semiconductors’ PDIUSBH11A is a compound Universal Serial Bus (USB) hub IC (hub plus
embedded function) that supports 4 downstream devices. (Figure 1). The embedded function
appears as PORT1 to the host and the four downstream ports are numbered 2 through 5.

It is used in a micro-controller-based system and communicates with the system micro-controller
over the I

2

C serial bus. This modular approach to implementing a hub and embedded function

allows the designer to maintain the system micro-controller of choice and retain the 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 PDIUSBH11A conforms to the USB specification 1.1 and I

2

C serial interface specification. It is

also compliant with the USB Human Input Device and Monitor Control Class specifications.

U S B
H u b

D e v i c e

1

D e v i c e

2

D e v i c e

3

D e v i c e

4

D o w n s t r e a m

D o w n s t r e a m

D o w n s t r e a m

D o w n s t r e a m

U p s t r e a m

H o s t

M i c r o - c o n t r o l l e r

I

2

C

Figure 1: Application Diagram

0.1 I

2

C Interface

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An external micro-controller is used to control the operation of the hub using the I

2

C bus. To reduce

costs, the target system micro-controller can be shared and utilised for this purpose. The
PDIUSBH11A implements a slave I

2

C interface. When the PDIUSBH11A needs to communicate

with the micro-controller, it asserts an interrupt signal. The micro-controller services this interrupt by
reading the appropriate status register on the PDIUSBH11A through the I

2

C bus. (Figure 2).

H11 HUB

Upstream

Downstream

Controller

Interrupt

Reset_H11

Command

Data

Figure 2: Interactions between micro-controller and hub

0.2 Programming Methodology

The I

2

C interface on the PDIUSBH11A defines two types of transactions:

•

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.

•

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 that was sent before the data transaction.

Different addresses are used for 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 PDIUSBH11A and the controller.

Address Table:

Type of Address

Physical Address (MSB to LSB)

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Command

0011011 (binary)

Data

0011010 (binary)

Programming the PDIUSBH11A consists of two steps:

Command Phase – Write the command code to the Command Address
Data Phase – Write data to or read data from the Data Address.

Command codes are listed in the PDIUSBH11A data sheet.

1 Initialization

The initialization of the PDIUSBH11A is described in the following flowchart:

"Disconnect" H11A.

Set appropriate

configuration modes.

100ms delay loop

Connect H11A.

Initialize internal flags.

Figure 3 Flowchart of initialization

2 Main Control Loop

Upon finishing initialization, the program goes into the so-called main loop waiting for the interrupt
pin of the PDIUSBH11A to go low, signalling that a request has been initiated. The micro-controller
then reads the interrupt register to determine the origin of the interrupt. Control is then passed to the
appropriate endpoint subroutine for further processing. (Figure 3).

After a bus reset, an interrupt will also be generated. However all bits in the interrupt register will be
zeroes. The firmware must enable the hub, set its address to 0 and disable the embedded function.

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Read Interrupt

Register

Interrupt

pin low?

No

USB Routine

Is packet

for Hub Control

Out Endpoint?

No

Hub

Endpoint0

Out

Yes

Is packet

for Hub Control

In Endpoint?

Is packet

for Function Control

Out Endpoint?

No

Is packet

for Function Control

In Endpoint?

No

No

Hub

Endpoint0

In

Yes

Func.

Endpoint0

Out

Yes

Func.

Endpoint0

In

Yes

Host sends reset signal to Hub:

1. Enable Hub at address 0

2. Disable embedded function

The main flow chart

of USB control routine

Main

Figure 4: Main Control Loop

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3 Hub Control Subroutine

3.1 Hub Control In Endpoint

Data to be sent to the host are written to the IN buffer and will be transferred when the next IN token
is received. A Read Last Transaction Status command is sent to reset the interrupt flag before
issuing a Select Endpoint command which initialises the internal pointer to the start of the selected
buffer. Previous data in the buffer must be transferred before further processing can take place. If
the last request is a Set Address command, the new address is written to the device. (Figure 4).

Read Last Hub

Transaction Status

Select Hub Endpoint0

In and read one byte

Buffer

empty?

No

Yes

Hub Control Endpoint In

Flow chart

Are all data

sent to host?

Yes

Send 8 bytes data

Yes

No

to host

No

Is last command

" Set address"?

Change Hub address

Hub

Endpoint0

In

Main

Main

Figure 5: Hub Control In Endpoint Flow Chart

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3.2 Hub Control Out Endpoint

A packet consisting of a SETUP token precedes all requests. After selecting the hub endpoint, the
Read Endpoint Status command ensures that a SETUP token has been received. The Acknowledge
Setup command is given to unlock both the IN and OUT buffers before the next packet, which
contains the actual request, is read. (Figure 5).

Control is then transferred to the appropriate routine where the request is carried out. (Figure 6 &
Figure 7). When an unsupported command is encountered, a stall status is returned to the host.

There are two types of commands:
Hub Standard Commands
Hub Class Commands

3.3 Standard Commands

Flow charts for supported standard commands are shown as follows:

Ø

Clear Feature (Figure 8)

Ø

Set Feature (Figure 9)

Ø

Get Status (Figure 10)

Ø

Set Address (Figure 11)

Ø

Get Descriptor (Figure 12)

Ø

Get Configuration (Figure 13)

Ø

Set Configuration (Figure 14)

Ø

Get Interface (Figure 15)

Ø

Set Interface (Figure 15)

H u b

Endpoint0

O u t

Select Hub Control

Endpoint Out

Read Hub Control

Endpoint Status

Setup

packet ?

N o

FIFO

S e n d A C K _ Setup command to:

Hub Control Endpoint In

Hub Control Endpoint Out

Y e s

Read 10 bytes from

Hub Control Endpoint Out

Flow chart

Send Clear Buffer

c o m m a n d

C

M a i n

Figure 5: Hub Control Out Endpoint Flow Chart...(1)

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Get

Status

" Clear Feature "

command ?

No

" Set Feature "

Command ?

No

" Set Address "

command ?

No

No

D

Clear

Feature

Yes

Set

Feature

Yes

Yes

Set

Address

C

Does host send

8 bytes to H11?

No

" Get Status"

command ?

Yes

standard command ?

Yes

No

Hub Class

command

Yes

Main

Figure 6: Hub Control Out Endpoint Flow Chart...(2)

command ?

No

" Get Interface "

command ?

No

" Set Interface "

command ?

No

No

Set

Config

Yes

Yes

Get

Interface

Set

Interface

Yes

Send " Stall" to Hub

Control Endpoint0 In

Un supported

command

" Set Config "

Get

Descriptor

D

" Get Config "

command ?

Get

Config

Yes

" Get Descriptor "

command ?

No

Yes

Main

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Figure 7: Hub Control Out Endpoint Flow Chart...(3)

Feature selectors are used when enabling or disabling features specific to a device, interface or
endpoint. The values for the feature selectors are given below.

Feature Selector

Recipient

Value

DEVICE_REMOTE_WAKEUP

Device

1

ENDPOINT_STALL

Endpoint

0

3.3.1 Clear Feature

This command is used to clear or disable a specific feature.

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Clear

Feature

Is recipient Device?

Unsupported

command

Is recipient Interface?

Is recipient Endpoint?

No

Yes

No

Yes

No

Clear endpoint feature

according to

"Feature Selector"

Send zero length

packet

Clear device feature

according to

"Feature Selector"

Yes

Main

Figure 8: Hub

Clear Feature Standard Command

3.3.2 Set Feature

This command is used to set or enable a specific feature.

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S e t d e v i c e f e a t u r e

a c c o r d i n g t o

" F e a t u r e S e l e c t o r "

S e t

F e a t u r e

I s r e c i p i e n t D e v i c e ?

Y e s

N o

I s r e c i p i e n t I n t e r f a c e ?

I s r e c i p i e n t E n d p o i n t ?

Y e s

N o

Y e s

U n s u p p o r t e d

c o m m a n d

N o

S e t e n d p o i n t f e a t u r e

a c c o r d i n g t o

" F e a t u r e S e l e c t o r "

S e n d z e r o l e n g t h

p a c k e t

M a i n

Figure 9: Hub Set Feature Standard Command

3.3.3 Get Status

This command returns status for the specified recipient.

G e t

Status

Is recipient Device?

Is recipient Interface?

Is recipient Endpoint?

Return

Hub Status to host

Yes

N o

Return Hub

Interface Status to host

Yes

N o

Return Hub

Endpoint Status to host

Yes

Unsupported

c o m m a n d

N o

M a i n

M a i n

M a i n

Figure 10: Hub Get Status Standard Command

3.3.4 Set Address

This command sets the device address for all future device accesses.

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S e t

A d d r e s s

U p d a t e n e w a d d r e s s

t o H u b

a d d r e s s r e g i s t e r

S e n d z e r o l e n g t h

p a c k e t

M a i n

Figure 11: Hub Set Address Standard Command

3.3.5 Get Descriptor

This command returns the specified descriptor if the descriptor exists.

Get

Descriptor

Is descriptor type

"device"?

Is descriptor type

"configuration" ?

Send first 8 bytes

of Device descriptor

Yes

No

Yes

No

Send first 8 bytes of

Configuration descriptor

Send Stall

Main

Figure 12: Hub Get Descriptor Standard Command

3.3.6 Get Configuration

This command returns the current device configuration.

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G e t

C o n f i g

H a s H u b b e e n

" C o n f i g u r e d " ?

S e n t " 1 " t o H o s t

S e n t " 0 " t o H o s t

Y e s

N o

M a i n

Figure 13: Hub Get Configuration Standard Command

3.3.7

Set Configuration

This command sets the device configuration.

Set

Config

Does Host send

"0" to Hub?

Does Host send

"1" to Hub?

Clear Hub configuration

flag

Yes

No

Set Hub

configuration flag

Yes

Send zero length packet

Unsupported

Command

No

Main

Figure 14: Hub Set Configuration Standard Command

3.3.8 Set Interface

This command allows the host to select an alternate setting for the specified interface.

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3.3.9 Get Interface

This command returns the selected alternate setting for the specified interface

Get

Interface

Send "0" to Host

Set

Interface

Send zero length packet

Main

Main

Figure 15: Hub Get & Set Interface Standard Commands

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3.4 Hub Class Commands

Hub class commands are commands that are only applicable to the hub and are processed as
shown in Figure 16.

Flow charts for the supported class commands are shown as follows:

Ø

Clear Hub/Port Feature (Figure 17)

Ø

Set Hub/Port Feature (Figure 18)

Ø

Get Hub/Port Status (Figure 19)

Ø

Get Hub Descriptor (Figure 20)

" Clear Hub Feature"

command ?

Clear Hub/Port

Feature

Yes

No

" Set Hub Feature"

Command ?

No

" Get Hub descriptor"

command ?

No

No

Yes

Set Hub/Port

Feature

Get Hub

Descriptor

Yes

Unsupported

command

Hub class

Command

" Get Hub Status "

command ?

Get Hub/Port

Status

Yes

No

Figure 16: Hub Class Command Flow Chart

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Feature selectors are also used when enabling or disabling features specific to a hub or port. The
following are the valid feature selectors for the hub class.

Feature Selector

Recipient

Value

C_HUB_LOCAL_POWER

Hub

0

C_HUB_OVER_CURRENT

Hub

1

PORT_CONNECTION

Port

0

PORT_ENABLE

Port

1

PORT_SUSPEND

Port

2

PORT_OVER_CURRENT

Port

3

PORT_RESET

Port

4

PORT_POWER

Port

8

PORT_LOW_SPEED

Port

9

C_PORT_CONNECTION

Port

16

C_PORT_ENABLE

Port

17

C_PORT_SUSPEND

Port

18

C_PORT_OVER_CURRENT

Port

19

C_PORT_RESET

Port

20

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3.4.1 Clear Hub/Port Feature

This command resets a value reported in the hub/port status.

C l e a r

H u b / P o r t

F e a t u r e

Is recipient Hub?

Is recipient Port?

Y e s

N o

Y e s

N o

U n s u p p o r t e d

c o m m a n d

Clear Hub feature

according to

"Feature Selector"

Clear Port feature

according to

"Feature Selector"

M a i n

M a i n

Figure 17: Clear Hub/Port Feature Command

3.4.2 Set Hub/Port Feature

This command sets a value reported in the hub/port status.

S e t H u b / P o r t

F e a t u r e

I s r e c i p i e n t H u b ?

I s r e c i p i e n t P o r t ?

Y e s

N o

Y e s

N o

U n s u p p o r t e d

c o m m a n d

S e t H u b f e a t u r e

a c c o r d i n g t o

" F e a t u r e S e l e c t o r "

S e t P o r t f e a t u r e

a c c o r d i n g t o

" F e a t u r e S e l e c t o r "

M a i n

M a i n

Figure 18: Set Hub/Port Feature Command

3.4.3 Get Hub/Port Status

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This command returns the current hub/port status and the states that have changed since the
previous acknowledgment.

G e t H u b / P o r t

S t a t u s

I s r e c i p i e n t H u b ?

I s r e c i p i e n t P o r t ?

R e t u r n

H u b S t a t u s

t o h o s t

Y e s

N o

R e t u r n

P o r t S t a t u s t o h o s t

Y e s

N o

U n s u p p o r t e d

c o m m a n d

M a i n

M a i n

Figure 19: Get Hub/Port Status Command

3.4.4 Get Hub Descriptor

This command returns the hub descriptor.

G e t H u b

D e s c r i p t o r

I s d e s c r i p t o r t y p e

" H u b " ?

S e n d f i r s t 8 b y t e s

o f D e v i c e d e s c r i p t o r

Y e s

N o

U n s u p p o r t e d

C o m m a n d

M a i n

Figure 20: Get Hub Descriptor Command

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4 Embedded Function Control Subroutine

The host sees no difference between the embedded function and a function connected to one of the
downstream ports. Some of the port commands sent by the host must be handled appropriately by
the embedded function to appear as any other downstream port.

The examples in this section assume the use of an embedded function in a display monitor. Packets
sent to the embedded function control endpoints are processed in a similar manner as those sent to
the endpoints of the hub.

4.1 Function Control In Endpoint

Data to be sent to the host from the embedded function follows the same procedure as that for the
hub control in endpoint. (Figure 21).

Func.

Endpoint0

In

Read Embedded Func.

Last Transaction Status

Select Embedded

Func. endpoint0 In

and read one byte

Embedded Func. Control Endpoint In

Flow chart

Buffer

empty?

No

Yes

No

Send 8 bytes data

to Host

No

Is last command

" Set address"?

Are all data

sent to Host?

Yes

Change Embedded

Func address

Yes

Main

Main

Figure 21: Embedded Function Control In Endpoint Flow Chart

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4.2 Function Control Out Endpoint

Besides processing the SETUP token, the OUT token, which sends updated data to the display
monitor control program, is also processed.

Embedded function commands are grouped as follows:

q

Embedded Function Standard Commands

q

Embedded Function Class Commands

Commands that are not supported will return a stall status.

4.3 Standard Commands

Figure 22 – Figure 24 show the processing of standard commands.
Flow charts for the supported standard commands are shown as follows:

Ø

Get Function Status (Figure 25)

Ø

Clear Function Feature (Figure 26)

Ø

Set Function Feature (Figure 27)

Ø

Set Function Address (Figure 28)

Ø

Get Function Descriptor (Figure 29)

Ø

Get Function Configuration (Figure 30)

Ø

Set Function Configuration (Figure 31)

Ø

Get Function Interface (Figure 32)

Ø

Set Function Interface (Figure 32)

F u n c .

E n d p o i n t 0

O u t

S e l e c t E m b e d d e d F u n c .

Control Endpoint Out

R e a d E m b e d d e d F u n c .

Control Endpoint Status

E m b e d d e d F u n c . Control Endpoint Out

Flow chart

Setup

packet ?

S e n d A C K _Setup c o m m a n d t o :

F u n c . Control Endpoint In

F u n c . Control Endpoint Out

Y e s

Read 10 bytes from

F I F O

Send Clear Buffer

c o m m a n d

E

I s l a s t c o m m a n d

”Feature Report”

Y e s

D o e s H o s t

send 3 bytes to

e m b e d d e d f u n c .

S e n d D A C v a l u e t o

monitor

Y e s

Send zero length packet

t o H o s t

N o

N o

M a i n

N o

Figure 22: Embedded Function Control Out Endpoint Flow Chart...(1)

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N o

" C l e a r F e a t u r e "

c o m m a n d ?

" Set Feature "

c o m m a n d ?

N o

" Set Address "

c o m m a n d ?

N o

N o

F

C l e a r
F u n c

F e a t u r e

Y e s

S e t F u n c

F e a t u r e

Y e s

Y e s

S e t F u n c

A d d r e s s

G e t

f u n c S t a t u s

Y e s

N o

E

D o e s H o s t s e n d

8 bytes to F u n c ?

" Get Status"

c o m m a n d ?

N o

s t a n d a r d c o m m a n d ?

Y e s

Y e s

F u n c C l a s s s

c o m m a n d

N o

M a i n

Figure 23: Embedded Function Control Out Endpoint Flow Chart...(2)

" Set Config "

command ?

" Get Interface "

command ?

No

" Set Interface "

command ?

No

No

Set Func

Config

Yes

Yes

Get Func

Interface

Set Func
Interface

Yes

Unsupported

command

F

" Get Config "

command ?

No

Get Func

Config

Yes

" Get Descriptor "

command ?

Get Func

Descriptor

Yes

No

Figure 24: Embedded Function Control Out Endpoint Flow Chart...(3)

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4.3.1 Get Function Status

Get Func.

Status

Is recipient Device?

Is recipient Interface?

Is recipient Endpoint?

R e t u r n E m b e d d e d

F u n c Status to Host

Yes

No

R e t u r n E m b e d d e d Func

Interface Status to Host

Yes

No

R e t u r n E m b e d d e d Func .
Endpoint Status to Host

Yes

Unsupported

command

No

M a i n

M a i n

M a i n

Figure 25: Embedded Function Get Status Standard Command

4.3.2 Clear Function Feature

Clear Func.

Feature

Is recipient Device?

Is recipient Interface?

Yes

No

No

Unsupported

command

Is recipient Endpoint?

feature according to

"Feature Selector"

Yes

according to

Clear Embedded Func

endpoint feature

"Feature Selector"

Send zero length packet

Yes

No

Main

Clear Embedded Func.

Figure 26: Embedded Function Clear Feature Standard Command

4.3.3 Set Function Feature

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Is recipient Interface?

Is recipient Endpoint?

Yes

N o

Yes

Unsupported

c o m m a n d

N o

S e t E m b e d d e d F u n c .

e n d p o i n t f e a t u r e

a c c o r d i n g t o

" F e a t u r e S e l e c t o r "

S e n d z e r o l e n g t h p a c k e t

Set Func

Feature

I s r e c i p i e n t D e v i c e ?

S e t E m b e d d e d F u n c.

d e v i c e f e a t u r e

a c c o r d i n g t o

" F e a t u r e S e l e c t o r "

Yes

N o

M a i n

Figure 27: Embedded Function Set Feature Standard Command

4.3.4 Set Function Address

S e t F u n c .

A d d r e s s

U p d a t e n e w a d d r e s s
t o E m b e d d e d F u n c.

a d d r e s s r e g i s t e r

S e n d z e r o l e n g t h

p a c k e t

M a i n

Figure 28: Embedded Function Set Address Standard Command

4.3.5 Get Function Descriptor

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PDIUSBH11A / H12 - Hub / Monitor Firmware Application Notes

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Get Func.

Descriptor

Is descriptor type

"device"?

Is descriptor type

"configuration" ?

Send first 8 bytes

o f E m b e d d e d F u n c .

Device descriptor

Yes

N o

Yes

N o

Send first 8 bytes of

Embedded Func.

Configuration descriptor

Send Stall

Main

Figure 29: Embedded Function Get Descriptor Standard Command

4.3.6 Get Function Configuration

G e t F u n c .

C o n f i g

H a s

E m b e d d e d F u n c . b e e n

" C o n f i g u r e d " ?

S e n t " 1 " t o h o s t

S e n t " 0 " t o h o s t

M a i n

y e s

n o

Figure 30: Embedded Function Get Configuration Standard Command

4.3.7 Set Function Configuration

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PDIUSBH11A / H12 - Hub / Monitor Firmware Application Notes

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Set Func.

Config

Does host

send "0" to Embedded

Func.?

Does host

send "1" to Embedded

Func.?

Clear Embedded Func.

configuration flag

Yes

No

Set Embedded Func

configuration flag

Yes

Send zero length

packet

Unsupported

Command

No

Main

Figure 31: Embedded Function Set Configuration Standard Command

4.3.8 Get/Set Function Interface

G e t F u n c .

I n t e r f a c e

S e n d " 0 " t o H o s t

S e t F u n c .

I n t e r f a c e

S e n d z e r o l e n g t h

p a c k e t

M a i n

M a i n

Figure 32: Embedded Function Get/Set Interface Standard Command

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PDIUSBH11A / H12 - Hub / Monitor Firmware Application Notes

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4.4 Examples of Class Commands

Figure 33 and Figure 34 show the flow charts for the following supported monitor class commands:

Ø

Set Report

Ø

Get Report

F u n c . c l a s s

C o m m a n d

" G e t R e p o r t " c l a s s

c o m m a n d ?

N o

G e t R e p o r t

Y e s

U n s u p p o r t e d

c o m m a n d

" S e t R e p o r t " c l a s s

c o m m a n d ?

S e t R e p o r t

Y e s

N o

Figure 33: Embedded Function Class Command Flow Chart

Set Rep ort

“feature report” ?

Set feature report flag
& wait for next OUT

token for D A C v alue

Yes

No

Unsupported

command

Get Report

Send DAC

data according

to VES A op code

Main

Main

Yes

N o

“fea ture re port”?

U nsupported
Command

Figure 34: Embedded Function Monitor Class Command