Nxp Semiconductors UM10237 用户手册
UM10237_2
© NXP B.V. 2008. All rights reserved.
User manual
Rev. 02 — 19 December 2008
97 of 792
NXP Semiconductors
UM10237
Chapter 5: LPC24XX External Memory Controller (EMC)
11.2 16-bit wide memory bank connection
c. 32 bit wide memory bank interfaced to one 8 bit memory chip
Fig 16. 32 bit bank external memory interfaces ( bits MW = 10)
OE
CS
WE
CE
OE
WE
B3
B2
B1
B0
OE
WE
B3
B2
B1
B0
IO[31:0]
A[a_m:0]
A[a_m:0]
D[31:0]
BLS[2]
A[a_b:2]
BLS[3]
BLS[0]
BLS[1]
a. 16 bit wide memory bank interfaced to two 8 bit memory chips
b. 16 bit wide memory bank interfaced to a 16 bit memory chip
Fig 17. 16 bit bank external memory interfaces (bits MW = 01)
OE
CS
BLS[1]
D[15:8]
CE
OE
WE
OE
WE
IO[7:0]
A[a_m:0]
A[a_m:0]
BLS[0]
D[7:0]
CE
OE
WE
OE
WE
IO[7:0]
A[a_m:0]
A[a_m:0]
A[a_b:1]
OE
CS
WE
CE
OE
WE
UB
LB
OE
WE
UB
LB
IO[15:0]
A[a_m:0]
A[a_m:0]
D[15:0]
BLS[0]
A[a_b:1]
BLS[1]