UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
495 of 1269
NXP Semiconductors
UM10503
Chapter 21: LPC43xx External Memory Controller (EMC)
The SDRAM mode register is loaded in two steps:
1. Use the DYNAMICCONTROL register to issue a set mode command.
2. When the SDRAM is in the set mode state, issue an SDRAM read from an address
specific to the selected mode and the SDRAM memory organization.
This loads the mode register with the correct settings.
Table 382. SDRAM mode register description
Address line
SDRAM mode
register bit
Value
Description
A2:A0
2:0
Burst length
000
1 (M3 = 0)
1 (M3 =1)
001
2 (M3 = 0)
2 (M3 =1)
010
4 (M3 = 0)
4 (M3 =1)
011
8 (M3 = 0)
8 (M3 =1)
100
Reserved (M3 = 0)
Reserved (M3 = 1)
101
Reserved (M3 = 0)
Reserved (M3 = 1)
110
Reserved (M3 = 0)
Reserved (M3 = 1)
111
Full page (M3 = 0)
Reserved (M3 = 1)
A3
3
Burst type
0
Sequential
1
Interleaved
A6:A4
6:4
Latency mode
000
Reserved
001
Reserved
010
2
011
3
100
Reserved
101
Reserved
110
Reserved
111
Reserved
A8:A7
8:7
Operating mode. All other values are
reserved.
00
Standard operation
A9
9
Write burst mode
0
Programmed burst length
1
Single location access
A11:A10
11:10
Reserved