Nxp Semiconductors UM10237 用户手册
UM10237_2
© NXP B.V. 2008. All rights reserved.
User manual
Rev. 02 — 19 December 2008
67 of 792
1.
How to read this chapter
This chapter describes the external memory controller for all LPC2400 parts. For EMC
configurations that are specific to LPC2458 and LPC2420/60/68/70/78, see
configurations that are specific to LPC2458 and LPC2420/60/68/70/78, see
.
2.
Basic configuration
The EMC is configured using the following registers:
1. Power: In the PCONP register (
), set bit PCEMC.
Remark: The EMC is enabled on reset (PCEMC = 1). On POR and warm reset, the
EMC is enabled as well, see
EMC is enabled as well, see
and
2. Clock: see
.
UM10237
Chapter 5: LPC24XX External Memory Controller (EMC)
Rev. 02 — 19 December 2008
User manual
Table 64.
EMC configuration
Data bus
width/
memory
transaction
size
width/
memory
transaction
size
Pins
SDRAM configuration
registers
registers
Static memory
configuration registers
configuration registers
External
memory
connection
memory
connection
LPC2458
8-bit, 16-bit
A[19:0]
D[15:0]
OE, WE
BLS[1:0]
CS[1:0]
DYCS[1:0]
CAS, RAS
CLKOUT[1:0]
CKEOUT[1:0]
DQMOUT[1:0]
EMCDynamic Config1/0
EMCDynamic RasCas1/0
EMCStatic Config1/0
EMCStatic WaitWen1/0
EMCStatic WaitOen1/0
EMCStatic WaitRd1/0
EMCStatic WaitPage1/0
EMCStatic WaitWr1/0
EMCStatic WaitTurn1/0
LPC2420,
LPC2460,
LPC2460,
LPC2468,
LPC2470,
LPC2478
8-bit, 16-bit,
32-bit
32-bit
A[23:0]
D[31:0]
OE, WE
BLS[3:0]
CS[3:0]
DYCS[3:0]
CAS, RAS
CLKOUT[1:0]
CKEOUT[3:0]
DQMOUT[3:0]
EMCDynamic
Config3/2/1/0
Config3/2/1/0
EMCDynamic
RasCas3/2/1/0
RasCas3/2/1/0
EMCStatic Config3/2/1/0
EMCStatic
WaitWen3/2/1/0
WaitWen3/2/1/0
EMCStatic
WaitOen3/2/1/0
WaitOen3/2/1/0
EMCStatic WaitRd3/2/1/0
EMCStatic
WaitPage3/2/1/0
WaitPage3/2/1/0
EMCStatic WaitWr3/2/1/0
EMCStatic
WaitTurn3/2/1/0
WaitTurn3/2/1/0
,