lpc2939fbd208 NXP Semiconductors, lpc2939fbd208 Datasheet - Page 25

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

NXP Semiconductors
LPC2939_1
Preliminary data sheet
6.8.5 Clock description
6.8.6 EEPROM
6.9.1 Description
6.9 External Static Memory Controller (SMC)
The flash memory controller is clocked by CLK_SYS_FMC, see
EEPROM is a non-volatile memory mostly used for storing relatively small amounts of
data, for example for storing settings. It contains one 16 kB memory block and is
byte-programmable and byte-erasable.
The EEPROM can be accessed only through the flash controller.
The LPC2939 contains an external Static Memory Controller (SMC) which provides an
interface for external (off-chip) memory devices.
Key features are:
The SMC simultaneously supports up to eight independently configurable memory banks.
Each memory bank can be 8 bits, 16 bits or 32 bits wide and is capable of supporting
SRAM, ROM, burst-ROM memory, or external I/O devices.
A separate chip select output is available for each bank. The chip select lines are
configurable to be active HIGH or LOW. Memory bank selection is controlled by memory
addressing.
memory base addresses, chip selects, and bank internal addresses.
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Supports static memory-mapped devices including RAM, ROM, flash, burst ROM and
external I/O devices
Asynchronous page-mode read operation in non-clocked memory subsystems
Asynchronous burst-mode read access to burst-mode ROM devices
Independent configuration for up to eight banks, each up to 16 MB
Programmable bus-turnaround (idle) cycles (one to 16)
Programmable read and write wait states (up to 32), for static RAM devices
Programmable initial and subsequent burst-read wait state for burst-ROM devices
Programmable write protection
Programmable burst-mode operation
Programmable external data width: 8 bit, 16 bit, or 32 bit
Programmable read-byte lane enable control
Table 11
shows how the 32-bit system address is mapped to the external bus
Rev. 01 — 11 June 2009
ARM9 microcontroller with CAN, LIN, and USB
Section
LPC2939
© NXP B.V. 2009. All rights reserved.
6.7.2.
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