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03/06/00

GL651USB USB KEYBOARD HUB CONTROLLER

Version 1.0

TRANSCIVER: TRANSCIVER is the analog circuits, which takes care of the electrical

characteristics of USB.

SIE:

SIE is the serial interface engine. The main responsibility of SIE is to

code/decode USB protocol. SIE guarantee the GL651USB always

function in a correct state.

KMIF:

KMIF is the interface of key matrix and GL651USB. KMIF drives the

key matrix and sense the input. The sensed data is then output to the

registers, which provide the uC to judge the pressed key.

REGISTERS:

REGISTERS is the interface of hardware and software. The used

registers will be listed in the later section.

REPEATER:

REPEATER is the kernel of hub. It repeats the data accurately from the

upstream port to the downstream port, and vice versa.

PORT CONTROLLER: Each downstream port of hub needs a PORT CONTROLLER

respectively. It monitors the state of the port.

PLL:

PLL extracts 48 Mhz clock from input 12 Mhz clock. This 48 Mhz

clock is used to generate USB clock in the digital PLL circuit.

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REGISTER SUMMARY

MNEMONIC

OFFSET

DESCRIPTION

DEVCTL

00h

Device control register

EVTFLG_1

01h

USB function interrupt flag

EVTFLG_2

02h

USB function interrupt flag

RXCTL0_HB

03h

Endpoint 0 RX control of hub

RXCTL0_KB

04h

Endpoint 0 RX control of keyboard

TXCTL0_HB

05h

Endpoint 0 TX control of hub

TXCTL0_KB

06h

Endpoint 0 TX control of keyboard

TXCTL123

07h

Endpoint 1,2, and 3 TX control

FFDAT0_HB

08h

Data buffer (FIFO) for endpoint 0 of hub

FFDAT0_KB

09h

Data buffer (FIFO) for endpoint 0 of keyboard

FFDAT123

0Ah

Data buffer (FIFO) for endpoint 1, 2, and 3

BUFCTL

0Bh

Data buffer control register

DRVSEL

0Ch

DRV1 ~ DRV18 select

SENSE

0Dh

SENSE1 ~ SENSE8 input

ENDP_PORT_SEL

0Eh

Endpoint selected and hub port to be configured

HUB_STAT_CHG

0Fh

Hub status and status change indicator

PORT_STATUS

10h

Hub ports status indicator

BUS_PORT_DATA

11h

Hub ports status change indicator

HOST_CMD

12h

Host command to HUB

ENP2_IND

13h

Hub interrupt indicator