Texas Instruments OMAP5912 Reference Manual page 1372

USB Device Controller
Table 38. System Configuration Register 1 (SYSCON1) (Continued)
Bit Name
7 DATA_ENDIAN
6 DMA_ENDIAN
5 -
4 NAK_EN
3 AUTODEC_DIS
80 Universal Serial Bus (USB)
Description
The data endian bit can be set by the USB device controller to select little-
or big-endian format on data access (read or write):
0: Little endian
1: Big endian
The value after USB device controller hardware reset is low; after USB
reset, it is unchanged (keep previous configuration).
The DMA data endian bit can be set by the USB device controller to select
little- or big-endian format on data access (read or write):
0: Little endian
1: Big endian
The value after USB device controller hardware reset is low; after USB
reset, it is unchanged (keep previous configuration).
Reserved
The NAK enable bit can be set by the USB device controller to be signaled
for NAK transaction handshake response. When this bit is set,
STAT_FLG.NAK is set on a NAK handshake if no non-handled interrupt is
pending on the endpoint, and the endpoint interrupt is asserted.
In the normal mode, when cleared, NAK handshake response to the USB
host is made transparent to the USB device controller and no interrupt is
asserted:
0: NAK is disabled.
1: NAK is enabled.
The value after MPU or USB reset is low.
Note: If the USB device controller sets this bit, it must wait for a NAK
interrupt before selecting TX endpoint to write TX data.
The autodecode process disabled can be set to force software to handle all
EP0 transactions (except the SET_ADDRESS transaction):
0: Autodecode process is activated (see Table 55, Autodecoded Versus
Non-Autodecoded Control Requests).
1: Autodecode process is deactivated.
The value after USB device controller hardware reset is low; after USB
reset, it is unchanged.
SPRU761A