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UM10503
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User manual
Rev. 1.3 — 6 July 2012
489 of 1269
NXP Semiconductors
UM10503
Chapter 21: LPC43xx External Memory Controller (EMC)
21.7.24 Static Memory Read Delay registers
The StaticWaitRd registers enable you to program the delay from the chip select to the
read access. 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. It
is not used if the extended wait bit is enabled in the StaticConfig registers. These registers
are accessed with one wait state.
[1]
The reset value depends on the boot mode.
21.7.25 Static Memory Page Mode Read Delay registers
The StaticWaitPage registers enable you to program the delay for asynchronous page
mode sequential accesses. 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.
This register is accessed with one wait state.
Table 377. Static Memory Output Enable delay registers (STATICWAITOEN[0:3], address
0x4000 5208 (STATICWAITOEN0), 0x4000 5228 (STATICWAITOEN1), 0x4000 5248
(STATICWAITOEN2), 0x4000 5268 (STATICWAITOEN3)) bit description
Bit
Symbol
Description
Reset
value
3:0
WAITOEN
Wait output enable.
Delay from chip select assertion to output enable.
0x0 = No delay (POR reset value).
0x1 - 0xF = n cycle delay. The delay is WAITOEN 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.
-
Table 378. Static Memory Read Delay registers (STATICWAITRD[0:3], address 0x4000 520C
(STATICWAITRD0), 0x4000 522C (STATICWAITRD1), 0x4000 524C
(STATICWAITRD2), 0x4000 526C (STATICWAITRD3)) bit description
Bit
Symbol
Description
Reset
value
4:0
WAITRD
Non-page mode read wait states or asynchronous page mode read first
access wait state.
Non-page mode read or asynchronous page mode read, first read only:
0x0 - 0x1E = (n + 1) CCLK cycles for read accesses. For
non-sequential reads, the wait state time is ( 1) x tCCLK.
0x1F = 32 CCLK cycles for read accesses (POR reset value).
0x1F
31:5
-
Reserved, user software should not write ones to reserved bits. The
value read from a reserved bit is not defined.
-