MCIMX27 Datasheet, PDF (170/1650 Pages) Freescale Semiconductor, Inc – Multimedia Applications Processor

System Control
4.2.14 Drive Strength Control Register 9
The Drive Strength Control Register 9 (DSCR9) controls the driving force parameters of the fast I/O
signals in the i.MX27 device. Figure 4-14 shows the register and Table 4-15 provides its field descriptions.
0x1002_7840 (DSCR9)
Access: User R/W
31
R0
W
Reset 0
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
0
DS_FAST127 DS_FAST126 DS_FAST125 DS_FAST124 DS_FAST123 DS_FAST122 DS_FAST121
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
R
DS_FAST120 DS_FAST119 DS_FAST118 DS_FAST117 DS_FAST116 DS_FAST115 DS_FAST114 DS_FAST113
W
Reset 0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 4-14. Drive Strength Control Register 9 (DSCR9)
Table 4-15. Drive Strength Control Register 9 Field Descriptions
Field
Description
31–30
Reserved. These bits are reserved and should read 0.
29–28
DS_FAST127
Drive Strength Fast I/O. Controls the driving strength of fast I/O group 127 (M_REQUEST).
00 Normal
01 High
10 Max high
11 Max high
27–26
DS_FAST126
Drive Strength Fast I/O. Controls the driving strength of fast I/O group 126 (M_GRANT).
00 Normal
01 High
10 Max high
11 Max high
25–24
DS_FAST125
Drive Strength Fast I/O. Controls the driving strength of fast I/O group 125 (IOIS16).
00 Normal
01 High
10 Max high
11 Max high
23–22
DS_FAST124
Drive Strength Fast I/O. Controls the driving strength of fast I/O group 124 (PC_POE).
00 Normal
01 High
10 Max high
11 Max high
21–20
DS_FAST123
Drive Strength Fast I/O. Controls the driving strength of fast I/O group 123 (PC_RW_B).
00 Normal
01 High
10 Max high
11 Max high
4-28
MCIMX27 Multimedia Applications Processor Reference Manual, Rev. 0.2
Freescale Semiconductor