CONTROL_MODULE Registers
Table 9-15. control_emif_sdram_config Register Field Descriptions (continued)
Bit
Field
Type
Reset
Description
22-21
DYN_ODT
R/W
0h
DDR3 Dynamic ODT.
Set to 0 to turn off dynamic ODT.
Set to 1 for RZQ/4 and set to 2 for RZQ/2.
All other values are reserved.
20
Reserved
R
0h
Reserved. Read returns 0.
19-18
SDRAM_DRIVE
R/W
0h
SDRAM drive strength.
For DDR2, set to 0 for normal, and set to 1 for weak drive strength.
For DDR3, set to 0 for RZQ/6 and set to 1 for RZQ/7.
For LPDDR1, set to 0 for full, set to 1 for 1/2, set to 2 for 1/4, and set
to 3 for 1/8 drive strength.
All other values are reserved.
17-16
CWL
R/W
0h
DDR3 CAS Write latency. Value of 0, 1, 2, and 3 (CAS write latency
of 5, 6, 7, and 8) are supported. Use the lowest value supported for
best performance. All other values are reserved.
15-14
NARROW_MODE
R/W
0h
SDRAM data bus width. Set to 0 for 32-bit and set to 1 for 16-bit. All
other values are reserved.
13-10
CL
R/W
0h
CAS Latency. The value of this field defines the CAS latency to be
used when accessing connected SDRAM devices. Value of 2, 3, 4,
and 5 (CAS latency of 2, 3, 4, and 5) are supported for DDR2. Value
of 2, 4, 6, 8, 10, 12, and 14 (CAS latency of 5, 6, 7, 8, 9, 10, and 11)
are supported for DDR3. All other values are reserved.
9-7
ROWSIZE
R/W
0h
Row Size. Defines the number of row address bits of connected
SDRAM devices. Set to 0 for 9 row bits, set to 1 for 10 row bits, set
to 2 for 11 row bits, set to 3 for 12 row bits, set to 4 for 13 row bits,
set to 5 for 14 row bits, set to 6 for 15 row bits, and set to 7 for 16
row bits. This field is only used when ibank_pos field in SDRAM
Config register is set to 1, 2, or 3.
6-4
IBANK
R/W
0h
Internal Bank setup. Defines number of banks inside connected
SDRAM devices. Set to 0 for 1 bank, set to 1 for 2 banks, set to 2 for
4 banks, and set to 3 for 8 banks. All other values are reserved.
3
EBANK
R/W
0h
External chip select setup. Defines whether SDRAM accesses will
use 1 or 2 chip select lines. Set to 0 to use pad_cs_o_n[0] only. Set
to 1 to use pad_cs_o_n[1:0].
2-0
PAGESIZE
R/W
0h
Page Size. Defines the internal page size of connected SDRAM
devices. Set to 0 for 256-word page (8 column bits), set to 1 for 512-
word page (9 column bits), set to 2 for 1024-word page (10 column
bits), and set to 3 for 2048-word page (11 column bits). All other
values are reserved.
767
SPRUH73H – October 2011 – Revised April 2013
Control Module
Copyright © 2011–2013, Texas Instruments Incorporated