Extensibility byte requested by host, Extended control register – Digi NS9750 User Manual
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B B u s s l a v e a n d D M A i n t e r f a c e
6 9 8
N S 9 7 5 0 H a r d w a r e R e f e r e n c e
Extensibility Byte Requested by Host
Address: 9040 0124
This register is updated shortly after a new negotiation occurs (event 4 of the
negotiation process; see the IEEE 1284 standard for more information).
Register bit assignment
Extended Control register
Address: 9040 0128
The Extended Control register enables additional core features.
Bits
Access
Mnemonic
Reset
Description
D31:08
N/A
Reserved
N/A
N/A
D07:00
R/W
exr
0x0
Extensibility byte
Stores the extensibility byte received from the host.
Table 406: exr — Extensibility Byte Requested by Host register
exr
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
Reserved
Not
used
EnRev
DtTrn
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
Reserved
Reserved