CONTROL_MODULE Registers
9.3.91 ddr_data0_ioctrl Register (offset = 1440h) [reset = 0h]
ddr_data0_ioctrl is shown in
and described in
.
Figure 9-94. ddr_data0_ioctrl Register
31
30
29
28
27
26
25
24
Reserved
io_config_wd1_dqs
io_config_wd1_dm
io_config_wd1_dq
R-0h
R/W-0h
R/W-0h
R/W-0h
23
22
21
20
19
18
17
16
io_config_wd1_dq
io_config_wd0_dqs
io_config_wd0_dm
io_config_wd0_dq
R/W-0h
R/W-0h
R/W-0h
R/W-0h
15
14
13
12
11
10
9
8
io_config_wd0_dq
io_config_sr_clk
R/W-0h
R/W-0h
7
6
5
4
3
2
1
0
io_config_i_clk
io_config_sr
io_config_i
R/W-0h
R/W-0h
R/W-0h
LEGEND: R/W = Read/Write; R = Read only; W1toCl = Write 1 to clear bit; -n = value after reset
Table 9-101. ddr_data0_ioctrl Register Field Descriptions
Bit
Field
Type
Reset
Description
31-30
Reserved
R
0h
29
io_config_wd1_dqs
R/W
0h
Input that selects pullup or pulldown for DDR_DQS0 and
DDR_DQSn0.
Used with io_config_wd0_dqs to define pullup/pulldown according to
the following:
WD1: WD0
00b: Pullup/Pulldown disabled for both DDR_DQS0 and
DDR_DQSn0
01b: Enable weak pullup for DDR_DQS0 and weak pulldown for
DDR_DQSn0
10b: Enable weak pulldown for DDR_DQS0 and weak pullup for
DDR_DQSn0
11b: Weak keeper enabled for both DDR_DQS0 and DDR_DQSn0
28
io_config_wd1_dm
R/W
0h
Input that selects pullup or pulldown for DM.
Used with io_config_wd0_dm to define pullup/pulldown according to
the following:
WD1:WD0
00: Pullup/Pulldown disabled
01: Weak pullup enabled
10: Weak pulldown enabled
11: Weak keeper enabled
27-20
io_config_wd1_dq
R/W
0h
Input that selects pullup or pulldown for DQ.
There are 2 bits per IO: io_config_wd1_dq and io_config_wd0_dq.
For example:
macro pin 0: WD1 is bit 20 WD0 is bit 10
macro pin 1: WD1 is bit 21, WD0 is bit 11
...
macro pin 7: WD1 is bit 27, WD0 is bit 17
See the DDR PHY to IO Pin Mapping table in the Control Module
Functional Description section for a mapping of macro bits to I/Os.
WD1:WD0
00: Pullup/Pulldown disabled
01: Weak pullup enabled
10: Weak pulldown enabled
11: Weak keeper enabled
859
SPRUH73H – October 2011 – Revised April 2013
Control Module
Copyright © 2011–2013, Texas Instruments Incorporated