Digi NS9750 User Manual
Page 532

D M A b u f f e r d e s c r i p t o r
5 0 8
N S 9 7 5 0 H a r d w a r e R e f e r e n c e
Bits
Mnemonic
Description
15:00
UNUSED
Not used — read back 0
Table 307: Peripheral bit fields: Serial controller — SPI TX mode
Bits
Mnemonic
Description
15:14
STATE
00
Undefined
01
Data phase transaction
10
Status phase transaction
11
No-data status phase transaction
Defines the state of the endpoint after the most recent
communication with the USB device module.
This field is used primarily for debugging.
13
M31
See the USB Controller module chapter.
12
M30
See the USB Controller module chapter.
11:00
CIA
If field M30 equals 1, this field contains the least
significant 12 bits of the Setup command address. Because
all Setup command addresses are required to be in the
format
???
, where
???
is not equal to 000, the most
significant nibble is zero.
If the M30 field equals 0, this field contains the
configuration, interface, and alternate information for the
specified endpoint.
Table 308: Peripheral bit fields: USB device controller
Bits
Mnemonic
Description
15:00
UNUSED
Not used — read back 0
Table 309: Peripheral bit fields: IEEE 1284 controller