STW4810 datasheet(37/72 Pages) STMICROELECTRONICS

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STw4810

4 Functional description

Rev3

37/72

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

control register 1

(

Table 30, Table 31):

uart_en=0; oe_int_en=0

If oe_int_en = 1 and suspend=1 (USB control register 1 -

Table 10), the USBOEn ball becomes

an output used to generate an IT to multimedia processor.

Table 30.

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

Table 31.

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

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)

0 (off)

Driver are suspended

0 (VP_VM mode)

0 (off)

0 (VP_VM mode)

0 (off)

0 (VP_VM mode)

0 (off)

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