STW4811M datasheet(49/86 Pages) STMICROELECTRONICS

49 / 86 page

Functional description

STw4811M/STw4811N

48/85

4.4.2

Modes and operations

Power modes

The transceiver power modes are:

●

active mode

●

suspend mode

●

power down mode

In suspend mode the differential transmitter and receiver are turned off to save power but

the USB interface is still active (pull-up and pull-down on, VBUS on).

In power down mode, only the serial interface is active and the transceiver is able to detect

SRP. In power down mode, ID ball can be grounded by ‘id_gnd’ bit of

USB control register 2

(

Table 12).

USB modes

The two transceiver modes are:

●

DAT_SEO mode (dat_se0 = 1 in

USB control register 1 - Table 11)

●

VP_VM mode (dat_se0 = 0 in

USB control register 1 - Table 11)

Data transmission The transceiver transmits USB data in the following conditions for

USB

control register 1

(Table 32, Table 33):

uart_en=0; oe_int_en=0

and USBOEn ball at low level.

Table 32.

Data transmission via USB control register 1 (DAT_SE0 mode) - Suspend = 0

USB mode

(DAT_SE0)

Inputs

Outputs

Comments

USBVP

USBVM

USBRCV

1 (DAT_SE0 mode)

Not used

Single ended data (zero sent)

1 (DAT_SE0 mode)

Not used

Single ended data (1 sent)

1 (DAT_SE0 mode)

Not used

Force single ended zero

0 (VP_VM mode)

DIFF_RX

DAT_VP drives the level of DP

SE0_VM drives the level of DN

0 (VP_VM mode)

DIFF_RX

0 (VP_VM mode)

DIFF_RX

0 (VP_VM mode)

DIFF_RX

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