Texas Instruments AM335 Series Technical Reference Manual

CONTROL_MODULE Registers www.ti.com
9.3.5 control_emif_sdram_config Register (offset = 110h) [reset = 0h]
The CONTROL_EMIF_SDRAM_CONFIG register exports SDRAM configuration information to the EMIF
after resuming from low power scenarios.
This register should be loaded with the same value as SDRAM_CONFIG during DDR initialization.
control_emif_sdram_config is shown in Figure 9-8 and described in Table 9-15.
Figure 9-8. control_emif_sdram_config Register
31 30 29 28 27 26 25 24
SDRAM_TYPE IBANK_POS DDR_TERM
R/W-0h R/W-0h R/W-0h
23 22 21 20 19 18 17 16
Reserved DYN_ODT Reserved SDRAM_DRIVE CWL
R-0h R/W-0h R-0h R/W-0h R/W-0h
15 14 13 12 11 10 9 8
NARROW_MODE CL ROWSIZE
R/W-0h R/W-0h R/W-0h
7 6 5 4 3 2 1 0
ROWSIZE IBANK EBANK PAGESIZE
R/W-0h 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 9-15. control_emif_sdram_config Register Field Descriptions
Bit Field Type Reset Description
31-29 SDRAM_TYPE R/W 0h
SDRAM Type selection
000 – Reserved
001 – LPDDR1
010 – DDR2
011 – DDR3
100 – Reserved
101 – Reserved
110 – Reserved
111 – Reserved
28-27 IBANK_POS R/W 0h
Internal bank position.
00 - All Bank Address bits assigned from OCP address above
column address bits.
01 – Bank Address bits [1:0] assigned from OCP address above
column address bits and bit [2] from OCP address bits above row
address bits.
10 – Bank Address bit [0] assigned from OCP address above
column address bits and bit [2:1] from OCP address bits above row
address bits.
11 – All Bank Address bits assigned from OCP address bits above
row address bits.
26-24 DDR_TERM R/W 0h
DDR2 and DDR3 termination resistor value. Set to 0 to disable
termination.
For DDR2, set to 1 for 75 ohm, set to 2 for 150 ohm, and set to 3 for
50 ohm.
For DDR3, set to 1 for RZQ/4, set to 2 for RZQ/2, set to 3 for RZQ/6,
set to 4 for RZQ/12, and set to 5 for RZQ/8.
All other values are reserved.
23 DDR2_DDQS R/W 0h
DDR2 differential DQS enable.
Set to 0 for single ended DQS.
Set to 1 for differential DQS
766
Control Module SPRUH73H–October 2011–Revised April 2013
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Texas Instruments AM335 Series Specifications

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Brand	Texas Instruments
Model	AM335 Series
Category	Computer Hardware
Language	English