Public Version
SDRAM Controller (SDRC) Subsystem
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10.2.6.4.3 SDRAM Device Compatibility Verification
In this example, a mobile DDR SDRAM memory with the following characteristics is verified for
compatibilty:
•
Type: Mobile DDR SDRAM
•
Size: 512 Mbits (16M * 32 in 4 banks)
lists the SDRAM versus the SDRC controller characteristics.
Table 10-110. SDRAM vs SDRC Controller Characteristics
SDRAM Parameter
SDRC Controller
512-Mbit MDDR SDRAM (16M * 32)
Co
mpa
tibili
ty
Device type
Mobile SDR / low-power DDR
Low-power DDR
yes
Operating voltage
VDD = VDDQ = 1.7V to 1.9V; VSS = VSSQ =
0.8xVDDQ >= High level <= VDDQ +
yes
0.0V (and LVCMOS 1.8V I/Os)
0.3V
-0.3V <= Low level <= 0.2 * VDDQ
1.8V <= I/O power <= 1.95V
Max operating frequency
200 MHz
200 MHz (DDR400)
yes
Memory size
Min: 16 Mbits, max: 1024M bits (2048 and
512 Mbits
yes
4096M bits may be supported)
Number of banks
2 (16 and 32 Mb) or 4 (other)
4
yes
Data path SDRC/SDRAM
16- and 32-bit
32-bit
yes
Burst length
Burst of 2 (M-SDR) and Burst of 4 (LPDDR)
2, 4, 8
yes
Page size
Up to 16K bytes
2 Kbytes
yes
CAS latency
1 to 5 clock cycles
3
yes
Refresh interval
64ms / number of rows
7.8 us
yes
2300
Memory Subsystem
SWPU177N – December 2009 – Revised November 2010
Copyright © 2009–2010, Texas Instruments Incorporated
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