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DR
D
RAFT
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UM10316_0
© NXP B.V. 2008. All rights reserved.
User manual
Rev. 00.06 — 17 December 2008
495 of 571
NXP Semiconductors
UM10316
Chapter 28: LPC29xx Flash/EEPROM
3.7 Flash-memory BIST signature registers
The flash-memory BIST signature registers return signatures as produced by the
embedded signature generator. There is a 128-bit signature reflected by the four registers
FMSW0, FMSW1, FMSW2 and FMSW3.
The signature generated by the flash memory is used to verify the flash memory contents.
The generated signature can be compared with an expected signature and thus makes
unnecessary the more time- and code-consuming procedure of reading back the entire
contents.
show bit assignment of the FMSW0 and FMSW1, FMSW2,
FMSW3 registers respectively.
3.8 Flash interrupts
Burn, erase and signature generation (MISR) are asynchronous operations; i.e. after
initiating them it takes some time before they complete. During this period access to the
flash memory results in wait-states.
Table 421. FMSSTOP register bit description (FMSSTOP, address: 0x2020 0024)
* = reset value
Bit
Symbol
Access
Value
Description
31 to 18 reserved
R
-
Reserved; do not modify. Read as logic 0,
write as logic 0.
17
MISR_START
R/W
BIST start.
1
BIST signature generation is initiated.
0*
Reset value.
16 to 0
FMSSTOP[16:0]
R/W
BIST stop address divided by 16 (corresponds
to AHB byte address [20:4]).
0 0000h*
Reset value.
Table 422. FMSW0 register bit description (FMSW0, address: 0x2020 002C)
Bit
Symbol
Access
Value
Description
31 to 0
FMSW0[31:0]
R
-
Flash BIST 128-bit signature (bits 31 to 0).
Table 423. FMSW1 register bit description (FMSW1, address: 0x2020 0030)
Bit
Symbol
Access
Value
Description
31 to 0
FMSW1[63:32]
R
-
Flash BIST 128-bit signature (bits 63 to 32).
Table 424. FMSW2 register bit description (FMSW2, address: 0x2020 0034)
Bit
Symbol
Access
Value
Description
31 to 0
FMSW2[95:64]
R
-
Flash BIST 128-bit signature (bits 95 to 64).
Table 425. FMSW3 register bit description (FMSW3, address: 0x2020 0038)
Bit
Symbol
Access
Value
Description
31 to 0
FMSW3[127:96]
R
-
Flash BIST 128-bit signature (bits 127 to 96).