TUSB1104 datasheet(35/55 Pages) TI

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Table 7-15. AEQ_CONTROL1 Register Field Descriptions

Bit

Field

Type

Reset

Description

7-4

FULLAEQ_UPPER_EQ

R/W

This field sets the maximum EQ value to check for full AEQ mode

when in I2C mode.

USB3_U1_DISABLE

R/W

This field when set will cause entry to U3 instead of U1 when

electrical idle is detected.

0h = U1 entry after electrical idle.

1h = U3 entry after electrical idle.

2-1

AEQ_MODE

R/W

Selects Adaption mode (Fast, or one of three Full modes).

0h = Fast AEQ.

1h = Full AEQ, with hits counted at mideye for every EQ iteration

(using current EQ setting).

2h = Full AEQ, algorithm II.

3h = Full AEQ, with hits counted at mideye only for first EQ iteration

(using EQ set to the MID_HC_EQ value).

AEQ_EN

R/W

Controls whether or not adaptive EQ for USB downstream facing

port is enabled.

0h = AEQ disabled

1h = AEQ enabled

7.6.1.6 AEQ_CONTROL2 Register (Offset = 1Dh) [Reset = 10h]

AEQ_CONTROL2 is shown in Table 7-16.

Return to the Summary Table.

This register allows for controls for the Fast AEQ limits as well as adding or reducing final EQ value used by the

Full AEQ function.

Table 7-16. AEQ_CONTROL2 Register Field Descriptions

Bit

Field

Type

Reset

Description

OVER_EQ_SIGN

R/W

Selects the sign for OVER_EQ_CTRL field.

0h = positive

1h = negative

RESERVED

Reserved

5-3

FASTAEQ_LIMITS

R/W

Selects the upper/lower limits of DAC for determining short vs long

channel.

0h = +/- 0mV

1h = +/- 40mV

2h = +/- 80mV

3h = +/- 120mV

4h = +/- 160mV

5h = +/- 200mV

6h = +/- 240mV

7h = +/- 280mV

2-0

OVER_EQ_CTRL

R/W

This field will increase or decrease the AEQ by value programmed

into this field. For example, full AEQ value is 6 and this field is

programmed to 2 and OVER_EQ_SIGN = 0, then EQ value used will

be 8. This field is only used in Full AEQ mode.

0h = 0 or -8

1h = 1 or -7

2h = 2 or -6

3h = 3 or -5

4h = 4 or -4

5h = 5 or -3

6h = 6 or -2

7h = 7 or -1

7.6.1.7 AEQ_LONG Register (Offset = 1Eh) [Reset = 77h]

AEQ_LONG is shown in Table 7-17.

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