Digi NS9750 User Manual
Page 796
U S B D e v i c e E n d p o i n t F I F O C o n t r o l a n d D a t a r e g i s t e r s
7 7 2
N S 9 7 5 0 H a r d w a r e R e f e r e n c e
Register bit assignment
Bits
Access
Mnemonic
Reset
Description
D31
RW1TC
ACK6
0
Endpoint 4 acknowledge status. See Table 449, “USB
device endpoint status,” on page 770.
D30
RW1TC
NACK6
0
Endpoint 4 negative acknowledge status. See Table 449,
“USB device endpoint status,” on page 770.
D29
RW1TC
ERROR6
0
Endpoint 4 error status. See Table 449, “USB device
endpoint status,” on page 770.
D28:24
N/A
Reserved
N/A
Not valid in DMA mode.
D23
RW1TC
ACK5
0
Endpoint 3 acknowledge status. See Table 449, “USB
device endpoint status,” on page 770.
D22
RW1TC
NACK5
0
Endpoint 3 negative acknowledge status. See Table 449,
“USB device endpoint status,” on page 770.
D21
RW1TC
ERROR5
0
Endpoint 3 error status. See Table 449, “USB device
endpoint status,” on page 770.
D20:16
N/A
Reserved
N/A
Not valid in DMA mode.
D15
RW1TC
ACK4
0
Endpoint 2 acknowledge status. See Table 449, “USB
device endpoint status,” on page 770.
D14
RW1TC
NACK4
0
Endpoint 2 negative acknowledge status. See Table 449,
“USB device endpoint status,” on page 770.
D13
RW1TC
ERROR4
0
Endpoint 2 error status. See Table 449, “USB device
endpoint status,” on page 770.
D12:08
N/A
Reserved
N/A
Not valid in DMA mode.
D07
RW1TC
ACK3
0
Endpoint 1 acknowledge status. See Table 449, “USB
device endpoint status,” on page 770.
Table 451: FIFO Interrupt Status 1 register
13
12
11
10
9
8
7
6
5
4
3
2
1
0
15
14
31
29
28
27
26
25
24
23
22
21
20
19
18
17
16
30
Reserved
ERROR
4
Reserved
ACK4 NACK
4
Reserved
ACK3 NACK
3
ERROR
3
ACK6 NACK
6
ERROR
6
ERROR
5
NACK
5
ACK5
Reserved