Texas Instruments AM335 Series Technical Reference Manual

www.ti.com CONTROL_MODULE Registers
9.3.92 ddr_data1_ioctrl Register (offset = 1444h) [reset = 0h]
ddr_data1_ioctrl is shown in Figure 9-95 and described in Table 9-102.
Figure 9-95. ddr_data1_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 9-102. ddr_data1_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_DQS1 and
DDR_DQSn1.
Used with io_config_wd0_dqs to define pullup/pulldown according to
the following:
WD1:WD0
00b: Pullup/Pulldown disabled for both DDR_DQS1 and
DDR_DQSn1
01b: Enable weak pullup for DDR_DQS1 and weak pulldown for
DDR_DQSn1
10b: Enable weak pulldown for DDR_DQS1 and weak pullup for
DDR_DQSn1
11b: Weak keeper enabled for both DDR_DQS1 and DDR_DQSn1
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
861
SPRUH73H–October 2011–Revised April 2013 Control Module
Submit Documentation Feedback
Copyright © 2011–2013, Texas Instruments Incorporated

Texas Instruments AM335 Series Specifications

General

Brand	Texas Instruments
Model	AM335 Series
Category	Computer Hardware
Language	English