lpc2939fbd208 NXP Semiconductors, lpc2939fbd208 Datasheet - Page 24

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

NXP Semiconductors
LPC2939_1
Preliminary data sheet
6.8.3 Flash bridge wait-states
6.8.4 Pin description
Table 10.
The index sector is a special sector in which the JTAG access protection and sector
security are located. The address space becomes visible by setting the FS_ISS bit and
overlaps the regular flash sector’s address space.
Note that the index sector, once programmed, cannot be erased. Any flash operation must
be executed out of SRAM (internal or external).
To eliminate the delay associated with synchronizing flash-read data, a predefined
number of wait-states must be programmed. These depend on flash-memory response
time and system clock period. The minimum wait-states value can be calculated with the
following formulas:
Synchronous reading:
Asynchronous reading:
Remark: If the programmed number of wait-states (WST) is more than three, flash-data
reading cannot be performed at full speed (i.e. with zero wait-states at the AHB bus) if
speculative reading is active.
The flash memory controller has no external pins. However, the flash can be programmed
via the JTAG pins, see
WST
WST
Sector number
16
17
18
0
1
2
3
4
5
6
7
8
9
10
----------------- - 1
t
----------------- - 1
t
t
clk sys
clk sys
t
a clk
a A
Flash sector overview
–
–
Section
Sector size (kB)
8
8
8
64
64
64
64
64
64
64
64
64
64
64
Rev. 01 — 11 June 2009
6.6.3.
…continued
ARM9 microcontroller with CAN, LIN, and USB
Sector base address
0x2000 A000
0x2000 C000
0x2000 E000
0x2001 0000
0x2002 0000
0x2003 0000
0x2004 0000
0x2005 0000
0x2006 0000
0x2007 0000
0x2008 0000
0x2009 0000
0x200A 0000
0x200B 0000
LPC2939
© NXP B.V. 2009. All rights reserved.
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