7

08/18/00

GL652USB 7 PORT USB HUB CONTROLLER

Revision 1.2

SELF

: 0 - HUB is bus powered.

1 - HUB is self powered.

GANG

: 0 - HUB is in individual mode.

1 - HUB is in ganged mode.

EVTFLG

( offset 01, default = 00h )

R/W1C

R/W1C

R/W1C

R/W1C

R/W1C

R/W1C

R/W1C

R/W1C

USBRST

SOF

C_LCPWR WAKEUP

SUSPD

EP1TX

EP0TX

EP0RX

Interrupt event flag –

EP0RX

: a SETUP or OUT transaction to endpoint 0 is accepted

EP0TX

: USB host controller accepts data transmitted via endpoint 0.

EP1TX

: USB host controller accepts data transmitted via endpoint 1

SUSPD

: the controller goes into suspend state

WAKEUP

: remote wakeup is detected when global suspended

SOF

: SOF detected or generated by HUB timer.

C_LCPWR

: POWER source change.

USBRST

: End of USB reset

RXCTL0

( offset 02, default = 40h )

R/W

R/O

R/O

R/O

R/O

R/O

R/O

R/O

RXDIS

RXSETUP

RXOUT

RXSEQ

RXCNT3

RXCNT2

RXCNT1

RXCNT0

Status of endpoint 0 receiving –

RXCNT3~0

: EP0 received data byte count.

RXSEQ

: 1 - The received data PID is DATA1

0 - The received data PID is DATA0

RXOUT

: 1 - The received token PID is OUT.

RXSETUP

: 1 - The received token PID is SETUP.

RXDIS

: 0 - Endpoint 0 FIFO is empty and ready for data-packet receiving.

1 - Endpoint 0 FIFO is filled with data and will reject the new-coming data

packet.

If RXDIS = 1, the device will not accept an OUT transaction addressed to it, and will respond

with a NAK to an error-free transaction. Hardware will automatically set RXDIS after a

successful receiving. After processing, the micro-controller should clear RXDIS to enable next

data-packet receiving or free FF0 for filling of the data to transmit. Note that a SETUP

transaction addressed to the device is always accepted even though RXDIS = 1.

TXCTL0

( offset 03, default = 00h )

R/W

R/W

R/W

R/W

R/W

R/W

R/W

--

EP0STL

EP0OE

EP0SEQ

EP0CNT3

EP0CNT2

EP0CNT1

EP0CNT0

Endpoint 0 transmit setting –

EP0CNT3~0

: number of data bytes to transmit

EP0OE

: enable data transmit

1 – ready to transmit data packet

0 – not ready to transmit data packet (default)

EP0SEQ

: data packet type

0 –DATA0

1 –DATA1

EP0STL

: set endpoint 0 stall

1 – EP0 will respond to USB host controller with STALL packet

EP0STL will be automatically cleared when a setup transaction is accepted.