Endpoint descriptor #0–#11 registers – Digi NS9750 User Manual
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U S B D e v i c e B l o c k r e g i s t e r s
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N S 9 7 5 0 H a r d w a r e R e f e r e n c e
Endpoint Descriptor #0–#11 registers
Address: 9010 2004 / 2008 / 200C / 2010 / 2014 / 2018 / 201C / 2020 / 2024 / 2028 / 202C / 2030
The Endpoint Descriptor registers store the endpoint information. There are 12
registers, one for each endpoint descriptor. Each register contains the same
information for the endpoint descriptor.
Register bit assignment
Bits
Access
Mnemonic
Reset
Description
D31:29
N/A
Reserved
N/A
N/A
D28:19
R/W
MPS
10’h0
Maximum packet size.
D18:15
R/W
ALTSET
4’h0
Alternate setting to which this endpoint belongs.
D14:11
R/W
INTN
4’h0
Interface number to which this endpoint belongs.
D10:07
R/W
CNFGN
4’h0
Configuration number to which this endpoint belongs.
Note:
Value at 0x0 is not supported if dynamic
programming is enabled (CSRPRG set to 1 in
the Device IP Programming Control and Status
register).
D06:05
R/W
EDTP
2’h0
Endpoint type
00
Control
01
Isochronous
10
Bulk
11
Interrupt
D04
R/W
EDDIR
1h’0
Endpoint direction
0
Out
1
In
Table 446: Endpoint Descriptor register (for endpoint descriptors 0–11)
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
ALTSET
INTN
MPS
CNFGN
EDDIR
EDNBR
ALT
SET
EDTP