STULPI01A_12 datasheet(36/44 Pages) STMICROELECTRONICS

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ULPI registers

STULPI01A, STULPI01B

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Doc ID 14817 Rev 4

Note:

Address 10h-12h(Read), 10h(Write), 11h(Set), 12h(Clear).

If set, the bits in this register cause an interrupt event notification to be generated when the

corresponding PHY signal changes from high to low. By default, all transitions are enabled.

RxActive and RxError must always be communicated immediately and so are not included

in this register. Interrupt circuitry can be powered down in any mode when both rising and

falling edge enables are disabled. To ensure interrupts are detectable when clock is

powered down, the link should enable both rising and falling edges.

Note:

Address 13h(Read-only).

These bits indicate the current value of the interrupt source signal. Interrupt circuitry can be

powered down in any mode when both rising and falling edge enables are disabled. To

ensure interrupts are detectable when clock is powered down, the link should enable both

rising and falling edges.

Table 21.

USB interrupt enable falling register

Field name

Bits

Access

Reset

Description

Host disconnect fall

rd/wr/s/c

Generates an interrupt event notification when the host

disconnect changes from high to low. Applicable only in Host

mode.

VbusValid fall

rd/wr/s/c

Generates an interrupt event notification when VbusValid

changes from high to low.

SessValid fall

rd/wr/s/c

Generates an interrupt event notification when SessValid

changes from high to low. SessValid is the same as

UTMI+AValid.

SessEnd fall

rd/wr/s/c

Generates an interrupt event notification when SessEnd

changes from high to low.

ID fall

rd/wr/s/c

Generates an interrupt event notification when ID changes from

high to low. ID is valid 50 ms after IdPullup is set to 1b, otherwise

ID is undefined and should be ignored.

Reserved

7:5

rd/wr/s/c

Reserved

Table 22.

USB interrupt status register

Field name

Bits

Access

Reset

Description

Host disconnect

0rd

Current value of UTMI+Host disconnect output. Applicable only

in Host mode. Automatically reset to 0b when Low-power mode

is entered.

VbusValid

Current value of UTMI+VbusValid output.

SessValid

2rd

Current value of UTMI+SessValid output. SessValid is the same

as UTMI+AValid.

SessEnd

Current value of UTMI+SessEnd output.

4rd

Current value of UTMI+ID output. ID is valid 50 ms after IdPullup

is set to 1b, otherwise ID is undefined and should be ignored.

Reserved

7:5

Reserved

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