TUSB2E221 datasheet(35/65 Pages) TI

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Table 9-6. U_TX_ADJUST_PORT0 Register Field Descriptions (continued)

Bit

Field

Type

Reset

Default

from OTP

(Y/N)

Description

5-4

U_HS_TX_SLEW_RAT

E_P0

RH/W

THSR adjustment

USB HS TX Slew Rate (350ps - 575ps)

Default through OTP

0h = 350ps (typical)

1h = 425ps (typical)

2h = 500ps (typical)

3h = 575ps (typical) (hw default)

3-0

U_HS_TX_AMPLITUDE

_P0

RH/W

VEHSOD adjustment

USB HS TX Amplitude, measured p-p

USB 2.0 spec nominal will be 800mV

(-7.5% to 30% in 2.5% steps)

Default through OTP

This setting has no effect on amplitude during chirp J

(VCHIRPJ) or chirp K (VCHIRPK)

0h = 800mV - 7.5% , 740mV (typical)

1h = 800mV - 5.0% , 760mV (typical)

2h = 800mV - 2.5% , 780mV (typical)

3h = 800mV (USB 2.0 spec nominal) , 800mV (typical) (hw

default)

4h = 800mV + 2.5% , 820mV (typical)

5h = 800mV + 5.0% , 840mV (typical)

6h = 800mV + 7.5% , 860mV (typical)

7h = 800mV + 10% , 880mV (typical)

8h = 800mV + 12.5% , 900mV (typical)

9h = 800mV + 15% , 920mV (typical)

Ah = 800mV + 17.5% , 940mV (typical)

Bh = 800mV + 20% , 960mV (typical)

Ch = 800mV + 22.5% , 980mV (typical)

Dh = 800mV + 25% , 1000mV (typical)

Eh = 800mV + 27.5% , 1020mV (typical)

Fh = 800mV + 30% , 1040mV (typical)

9.1.5 U_HS_TX_PRE_EMPHASIS_P0 Register (Offset = 31h) [Reset = 39h]

U_HS_TX_PRE_EMPHASIS_P0 is shown in Table 9-7.

Return to the Summary Table.

Hardware default value can be overridden through factory programmable OTP for this register.

Table 9-7. U_HS_TX_PRE_EMPHASIS_P0 Register Field Descriptions

Bit

Field

Type

Reset

Default

from OTP

(Y/N)

Description

RESERVED

RH/W

Reserved

CDP_1_EN_P0

RH/W

Enables CDP using method 1 on port0

Default through OTP

0h = CDP using method 1 not enabled (hw default)

1h = CDP using method 1 enabled

5-4

U_HS_TX_PE_WIDTH_

RH/W

U2_TXPE_UI Adjustment

USB HS TX Pre-emphasis Width

Default through OTP

0h = 0.35 UI (typical)

1h = 0.45 UI (typical)

2h = 0.55 UI (typical)

3h = 0.65 UI (typical) (hw default)

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TUSB2E221

SNLS757B – JUNE 2024 – REVISED NOVEMBER 2024

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