USB97C201 datasheet(30/59 Pages) SMSC

30 / 59 page

SMSC DS – USB97C201

Page 30

Rev. 03/25/2002

PRELIMINARY

Table 26 - USB Bus Status Register

USB_STAT

(0xAB - RESET=0x00)

USB BUS STATUS REGISTER

BIT

NAME

R/W

DESCRIPTION

[7]

Reserved

This bit always reads “0”.

EP2_ERR

R/W

1 = Indicates that a token in the opposite direction inferred

by the DIR bit of EP2_CTL register was received, ie an

unexpected IN or OUT token.

2.0

R/W

1 = Host is high speed capable. This bit is set if high speed

signaling is received from the host.

USB_RESUME

R/W

1 = Indicates that RESUME signaling has been detected.

This is only valid if the USB97C201 is in the SUSPEND

state via bit 0 of the SIE_CONF register.

USB_RESET

R/W

1 = Indicates that a USB Reset has been detected.

ERROR

1 = Indicates that a USB Error has been detected. See the

USB_ERR register for details. This bit is cleared by clearing

the USB_ERR register.

Reserved

This bit always reads “0”.

Reserved

This bit always reads “0”.

The bits in this register (except bit 2) are cleared by writing a ‘1’ to the corresponding bit. These bits are ORed, if

unMASKED in the USB_MSK register, and drive a latch for the USB_STAT bit in the ISR_0 register.

Table 27 – USB Bus Status Mask Register

USB_MSK

(0xAC - RESET=0xFF)

USB BUS STATUS MASK REGISTER

BIT

NAME

R/W

DESCRIPTION

[7]

Reserved

This bit always reads “1”.

EP2_ERR

R/W

1 = Prevents generation of the USB_STAT bit in the ISR_0

2.0

R/W

1 = Prevents generation of the USB_STAT bit in the ISR_0

USB_RESUME

R/W

1 = Prevents generation of the USB_STAT bit in the ISR_0

the

USB_RESUME

bit

set

the

USB_STAT register.

USB_RESET

R/W

1 = Prevents generation of the USB_STAT bit in the ISR_0

ERROR

R/W

1 = Prevents generation of the USB_STAT bit in the ISR_0

Reserved

This bit always reads “1”.

Reserved

This bit always reads “1”.

Note1: The mask bits do not prevent the status in the USB_STAT register from being set, only from setting the

USB_STAT bit in the ISR_0 register.

USB97C201 Datasheet(PDF) 30 Page - SMSC Corporation

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