TUSB1104 datasheet(23/55 Pages) TI

23 / 55 page

7.3.3.2 Limited VOD

Limited VOD mode is used to set the actual VOD level and is used when TUSB1104 is configured in limited

redriver mode. In this mode the VOD is no longer a linear function of the input VID. For example, if the signal at

TUSB1104's input (VID) is at 600 mVpp then the TUSB1104's output VOD will be around 1000 mVpp (assuming

LINR_L3 is selected). The limited redriver mode is only supported on the SSRX1/2 transmitter. The TUSB1104

provides four different limited VOD settings. All four settings are available through register control.

Note

Limited redriver mode is disabled by default and can only be enabled by setting the

SSRX_LIMIT_ENABLE register. Once enabled, the VOD level for SSRX1/2 transmitters is controlled

by the USB_SSRX12_VOD register

7.3.3.3 Transmit Equalization (Limited Redriver Mode Only)

The TUSB1104 in limited redriver mode offers pre-shoot and de-emphasis controls for SSRX1/2 transmitter. The

TUSB1104 offers four pre-shoot levels and four de-emphasis levels. These levels can be changed by modifying

I2C registers.

SSRX1 transmitter equalization is controlled by TX1_PRESHOOT and TX1_DEEMPHASIS fields. When

SSRX_LIMIT_ENABLE = 1 and TX1_PRESHOOT_EN = 1, the TX1_PRESHOOT field selects between

four different pre-shoot levels. When SSRX_LIMIT_ENABLE = 1 and TX1_DEEMPHASIS_EN = 1, the

TX1_DEEMPHASIS field selects between four different de-emphasis levels.

SSRX2 transmitter equalization is controlled by TX2_PRESHOOT and TX2_DEEMPHASIS fields. When

SSRX_LIMIT_ENABLE = 1 and TX2_PRESHOOT_EN = 1, the TX2_PRESHOOT field selects between

four different pre-shoot levels. When SSRX_LIMIT_ENABLE = 1 and TX2_DEEMPHASIS_EN = 1, the

TX2_DEEMPHASIS field selects between four different de-emphasis levels.

Note

Transmitter equalization control is not supported in pin-strap mode.

7.3.4 USB 3.2 x2 Description

The TUSB1104 configured for USB 3.2 x2 mode will determine if the link is operating in USB 3.2 x2 or in USB

3.1 x1. If the link is USB 3.2 x2, then TUSB1104 will operate with one port operating as a USB 3.2 x1 port

and the remaining port following the lead of the other port. The port functioning as a USB 3.1 x1 port is called

the config lane. The determination of the config lane is based solely on the Type-C orientation. For normal

orientation (FLIP = L), Port 1 is the config lane. For the flipped orientation (FLIP = H), Port 2 is the config lane.

In USB 3.2 x2 the config lane will operate as a standard USB 3.2 x1 port. While in all USB low power states

(Disconnect, U1, U2, and U3), the non-config lane will be disabled in order to conserve power. Entry to and exit

from these low power states is determined solely by the config lane. If the config lane detects an exit from a low

power state, then the non-config will be enabled.

Table 7-4. Config Lane Selection

FLIP pin or FLIP_SEL register

CONFIG LANE

NON-CONFIG LANE

CRX1 -> SSRX1

CRX2 -> SSRX2

SSTX1 -> CTX1

SSTX2 -> CTX2

CRX2 -> SSRX2

CRX1 -> SSRX1

SSTX2 -> CTX2

SSTX1 -> CTX1

www.ti.com

TUSB1104

SLLSFL1 – APRIL 2022

Submit Document Feedback

Product Folder Links: TUSB1104

TUSB1104 датащи(PDF) 23 Page - Texas Instruments

TUSB1104 датащи(HTML) 23 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55

датащи скачать

ссылки URL