TM4C129XKCZAD Datasheet, PDF (552/2188 Pages) Texas Instruments – Tiva Microcontroller

System Control
Register 195: Ethernet MAC Peripheral Ready (PREMAC), offset 0xA9C
The PREMAC register indicates whether the Ethernet module is ready to be accessed by software
following a change in status of power, Run mode clocking, or reset. A power change is initiated if
the corresponding PCEMAC bit is changed from 0 to 1. A Run mode clocking change is initiated if
the corresponding RCGCEMAC bit is changed. A reset change is initiated if the corresponding
SREMAC bit is changed from 0 to 1.
The PREMAC bit is cleared on any of the above events and is not set again until the module is
completely powered, enabled, and internally reset.
Ethernet MAC Peripheral Ready (PREMAC)
Base 0x400F.E000
Offset 0xA9C
Type RO, reset 0x0000.0000
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
reserved
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
reserved
R0
Type RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
RO
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit/Field
31:1
0
Name
reserved
R0
Type
RO
RO
Reset
0
0
Description
Software should not rely on the value of a reserved bit. To provide
compatibility with future products, the value of a reserved bit should be
preserved across a read-modify-write operation.
Ethernet MAC Module 0 Peripheral Ready
Value Description
0 Ethernet MAC module 0 is not ready for access. It is unclocked,
unpowered, or in the process of completing a reset sequence.
1 Ethernet MAC module 0 is ready for access.
552
June 18, 2014
Texas Instruments-Production Data