lpc2939fbd208 NXP Semiconductors, lpc2939fbd208 Datasheet - Page 26

• Manufacturer Part Number: lpc2939fbd208
• Description: Arm9 Microcontroller With Can, Lin, And Usb
• Manufacturer: NXP Semiconductors

NXP Semiconductors
LPC2939_1
Preliminary data sheet
6.9.2 Pin description
6.9.3 Clock description
6.9.4 External memory timing diagrams
Table 11.
Table 12.
The external static-memory controller module in the LPC2939 has the following pins,
which are combined with other functions on the port pins of the LPC2939.
the external memory controller pins.
Table 13.
The external Static Memory Controller is clocked by CLK_SYS_SMC, see
A timing diagram for reading from external memory is shown in
between the wait state settings is indicated with arrows.
32-bit
system
address bit
field
31 to 29
28 to 26
25 and 24
23 to 0
CS[2:0]
000
001
010
011
100
101
110
111
Symbol
EXTBUS CSx
EXTBUS BLSy
EXTBUS WE
EXTBUS OE
EXTBUS A[23:0] A[23:0]
EXTBUS D[31:0] D[31:0]
External memory bank address bit description
External static memory controller banks
External memory controller pins
Symbol
BA[2:0]
CS[2:0]
-
A[23:0]
Bank
bank 0
bank 1
bank 2
bank 3
bank 4
bank 5
bank 6
bank 7
Pin name
CSx
BLSy
WE
OE
Rev. 01 — 11 June 2009
Description
external static memory base address (three most significant bits);
the base address can be found in the memory map; see
field contains ‘010’ when addressing an external memory bank.
chip select address space for eight memory banks; see
always ‘00’; other values are ‘mirrors’ of the 16 MB bank address
16 MB memory banks address space
Direction
OUT
OUT
OUT
OUT
OUT
IN/OUT
ARM9 microcontroller with CAN, LIN, and USB
Description
memory bank x select, x runs from 0 to 7
byte lane select input y, y runs from 0 to 3
write enable (active LOW)
output enable (active LOW)
address bus
data bus
Figure
LPC2939
5. The relationship
© NXP B.V. 2009. All rights reserved.
Table 13
Section
Ref.
Ref. 1
1. This
shows
6.7.2.
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