6

08/18/00

GL652USB 7 PORT USB HUB CONTROLLER

Revision 1.2

5

REGISTER SUMMARY

MNEMONIC

OFFSET

DESCRIPTION

DEVCTL

00h

Device control register

EVTFLG

01h

USB function interrupt flag

RXCTL0

02h

Endpoint 0 RX control

TXCTL0

03h

Endpoint 0 TX control

TXCTL1

04h

Endpoint 1 TX control

FFDAT

05h

Data buffer (FIFO) I/O port

BUFCTL

06h

Data buffer control register

PORTSEL

07h

Hub port to be configured

HUB_STAT_CHG

08h

Hub status and status change indicator

PORT_STATUS

09h

Hub ports status indicator

BUS_PORT_DATA

0Ah

Hub ports status change indicator

HOST_CMD

0Bh

Host command to downstream ports

ENP1_IND

0Ch

Endpoint 1 indicator

TRXFLAG

0Dh

Downstream port traffic flag

LED_INIT

0Eh

LED initial state

GPIOD

0Fh

General purpose I/O pin status

REV

10h

Chip revision

DEVSTUS

11h

USB device address and configuration status

Register Description

Terminology:

R/O:

read only

R/W:

read / write

R/W1C:

read / write “1” to clear

W/O:

write only

DEVCTL

( offset 00, default = 00h )

R/W

R/W

R/W

R/O

R/O

USBRDY

SFRAME

PWRDN

--

--

--

SELF

GANG

USBRDY

: 0 - USB interface is not ready. The device drives USB with SE0.

1 - USB interface is ready. The device stops driving USB with SE0.

After power-on reset, USBRDY is cleared and the device looks like

disconnected. Set USBRDY to ‘1’ to enable USB interface.

SFRAME

: short frame option for test purpose

Set SFRAME to ‘1’ will shorten frame length to 1/15 ms. It is to shorten the

time required for test.

PWRDN

: power down mode

In suspend state, firmware can set PWRDN to put the controller into power

down mo de. In this mode, the embedded micro-controller and most internal

activities are frozen. Hardware will automatically clear PWRDN upon

hardware reset or resume activities occur.