USB97C100QFP datasheet(50/64 Pages) SMSC

50 / 64 page

SMSC DS – USB97C100

Page 50

Rev. 01/03/2001

Table 85 - SIE Configuration Register

SIE_CONFIG

(0x7F98 - RESET=0x40)

SIE CONFIGURATION REGISTER

BIT

NAME

R/W

DESCRIPTION

FSEN

R/W

This bit indicates that the USB97C100 supports 12Mbps USB

data rates. This bit must be set to a one ‘1’ for normal

operation.

RST_SIE

R/W

1 = Resets the SIE

RST_FRAME

R/W

1 = Clears FRAMEL and Bit 0 through 2 of FRAMEH

EN_EXTFRAME

R/W

Extended Frame Count Enable. Expands the Frame count

from 11 bits to 16 bits for 8051 use.

0 = bits 7-3 of FRAMEH are driven to 0.

1 = Bits 7-3 of FRAMEH count 1-0 transitions of bit 2 in

FRAMEH.

SIE_SUSPEND

R/W

1 = Forces the SIE into USB Suspend Mode. The MCU must

determine that Suspend must be entered.

SIE_RESUME

R/W

1 = Forces the SIE to transmit Resume signaling on the line.

USB_RESUME

1 = Indicates Resume signaling has been detected on the line

while in the Suspend State. This signal causes a Resume

Power Management interrupt).

USB_RESET

1 = Indicates that the USB line is being reset. Asserted when

SE0 is present on the bus for 32 or more 12Mbps bit times.

This causes a USB_RESET Power management interrupt.

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