PNX1500E NXP Semiconductors, PNX1500E Datasheet - Page 216
PNX1500E
Manufacturer Part Number
PNX1500E
Description
Manufacturer
NXP Semiconductors
Datasheet
1.PNX1500E.pdf
(828 pages)
Specifications of PNX1500E
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4. The Boot From an I
Table 10: Examples of I
PNX15XX_PNX952X_SER_N_4
Product data sheet
Size
256 bytes
512 bytes
1 kilobytes
2 kilobytes
Device
ATMEL 24C02
ATMEL 24C04
ATMEL 24C08
NXP PCF85116-3
4.1 External I
2
C EEPROM Devices
If none of the built-in scripts is suitable e.g., due to a different type of NAND-Flash or
a different memory organization or anything not matching the internal boot scripts, an
external serial boot EEPROM is required. Depending on the application
characteristics, this can be a small (1 Kilobyte or less) EEPROM that contains a small
boot script and starts the PNX15xx/952x Series system in host-assisted mode or
boot from Flash memory or ROM devices. Alternately, a large serial EEPROM can be
used to contain a complete disk file system or an upload capability from another
device than Flash/ROM.
For a 2-Kilobyte or smaller EEPROM, the script must start at byte address 1 (not 0).
For a 4-Kilobyte or larger EEPROM, the boot script must start at byte address 0. More
details in
word value (the byte read first ends up as the least significant byte, LBS). The 32-bit
words are then interpreted as commands, as documented earlier in
Remark: It has been seen that depending on the Write Protect pin status, some
EEPROMs do not behave the same way on a write of 0 bytes
internal counter gets or does not get incremented which makes this rule of where the
first byte is located at address 0 or 1 different. Refer to EEPROM datasheet or try both
options.
The PNX15xx/952x Series Boot module supports all I
called 2-wire EEPROMs) that use a 1-byte or 2-byte address protocol and respond to
an I
example:
Table 10
operation for all these devices been verified.
•
•
•
•
2
It is recommended to avoid devices that have partial array write protection, since
such devices could be overwritten by accidental or intentional I
boot failure during the next reset.
Some devices may have additional functionality that is useful, like a watchdog
timer or a power voltage drop sensor.
Availability from different vendors may vary.
Programming protocols may vary.
C device code 1010 (binary). Subtle differences exist between devices For
2
Write Protection
Coverage
Full Array
Full Array
Full Array
Full Array
C EEPROM
lists a variety of devices. This list is by no means exhaustive, nor has
Section
2
C Boot EEPROM Types
Rev. 4.0 — 03 December 2007
4.3. Each set of four successive bytes is assembled into a 32-bit
Address Protocol
1 byte
1 byte
1 byte
1 byte
PNX15xx/952x Series
Comment
Tested
2
C EEPROMs (sometimes
Chapter 6: Boot Module
(Section
2
© NXP B.V. 2007. All rights reserved.
C writes, causing
Section
4.3). The
2.3.
6-216
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