Rainbow Electronics W90N745CDG - Manual (Page 196)

W90N745CD/W90N745CDG
Publication Release Date: September 22, 2006
- 191 - Revision A2
USB Operational Mode Enable Register
This register selects which operational mode is enabled. Bits defined as write-only are read as 0's.
REGISTER ADDRESS R/W DESCRIPTION
RESET
VALUE
OperationalModeEnable 0xFFF0_5204 R/W USB Operational Mode Enable Register 0x0000_0000
31 30 29 28 27 26 25 24
Reserved
23 22 21 20 19 18 17 16
Reserved
15 14 13 12 11 10 9 8
Reserved SIEPD
7 6 5 4 3 2 1 0
Reserved OVRCUR Reserved DBREG
BITS BIT DESCRIPTION
[31:9] Reserved Reserved. Read/write 0
[8] SIEPD
SIE Pipeline Disable
When set, waits for all USB bus activity to complete prior to
returning completion status to the List Processor. This is a failsafe
mechanism to avoid potential problems with the clk_dr transition
between 1.5 MHz and 12 MHz.
[7:4] Reserved Reserved. Read/write 0
[3] OVRCURP
OVRCURP (over current indicator polarity)
When the OVRCURP bit is clear, the OVRCUR non-inverted to
input into USB host controller. In contrast, when the OVRCURP bit
is set, the OVRCUR inverted to input into USB host controller.
[2:1] Reserved Reserved. Read/write 0
[0] DBREG
Data Buffer Region 16
When set, the size of the data buffer region is 16 bytes. Otherwise, the
size is 32 bytes.