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UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
488 of 1269
NXP Semiconductors
UM10503
Chapter 21: LPC43xx External Memory Controller (EMC)
[1]
Extended wait and page mode cannot be selected simultaneously.
[2]
EMC may perform burst read access even when the buffer enable bit is cleared.
21.7.22 Static Memory Write Enable Delay registers
The StaticWaitWen registers enable you to program the delay from the chip select to the
write enable. 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.
21.7.23 Static Memory Output Enable Delay registers
The StaticWaitOen registers enable you to program the delay from the chip select or
address change, whichever is later, to the output enable. 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.
20
P
Write protect.
0
0
Writes not protected (POR reset value).
1
Write protected.
31:21 -
-
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
Table 376. Static Memory Write Enable Delay registers (STATICWAITWEN[0:3], address
0x4000 5204 (STATICWAITWEN0), 0x4000 5224 (STATICWAITWEN1), 0x4000 5244
(STATICWAITWEN2), 0x4000 5264 (STATICWAITWEN3)) bit description
Bit
Symbol
Description
Reset
value
3:0
WAITWEN
Wait write enable.
Delay from chip select assertion to write enable.
0x0 = One CCLK cycle delay between assertion of chip select and
write enable (POR reset value).
0x1 - 0xF = (n + 1) CCLK cycle delay. The delay is (W1) x
tCCLK.
0x0
31:4
-
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
-