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UM10503
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User manual
Rev. 1.3 — 6 July 2012
486 of 1269
NXP Semiconductors
UM10503
Chapter 21: LPC43xx External Memory Controller (EMC)
21.7.21 Static Memory Configuration registers
The StaticConfig registers configure the static memory configuration. It is recommended
that these registers are modified during system initialization, or when there are no current
or outstanding transactions. This can be ensured by waiting until the EMC is idle, and then
entering low-power, or disabled mode. These registers are accessed with one wait state.
Table 374. Dynamic Memory RASCAS Delay registers (DYNAMICRASCAS[0:3], address
0x4000 5104 (DYNAMICRASCAS0), 0x4000 5124 (DYNAMICRASCAS1),
0x4000 5144 (DYNAMICRASCAS2), 0x4000 5164 (DYNAMICRASCAS3)) bit
description
Bit
Symbol
Value Description
Reset
value
1:0
RAS
RAS latency (active to read/write delay).
11
0x0
Reserved.
0x1
One CCLK cycle.
0x2
Two CCLK cycles.
0x3
Three CCLK cycles (POR reset value).
7:2
-
-
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
9:8
CAS
CAS latency.
11
0x0
Reserved.
0x1
One CCLK cycle.
0x2
Two CCLK cycles.
0x3
Three CCLK cycles (POR reset value).
31:10 -
-
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-
Table 375. Static Memory Configuration registers (STATICCONFIG[0:3], address 0x4000 5200
(STATICCONFIG0), 0x4000 5220 (STATICCONFIG1), 0x4000 5240
(STATICCONFIG2), 0x4000 5260 (STATICCONFIG3)) bit description
Bit
Symbol
Value Description
Reset
value
1:0
MW
Memory width.
0
0x0
8 bit (POR reset value).
0x1
16 bit.
0x2
32 bit.
0x3
Reserved.
2
-
-
Reserved, user software should not write ones to reserved bits.
The value read from a reserved bit is not defined.
-