TC1766 Flash Firmware Status Sheet

Flash Firmware Status Sheet
Rel. 1.6, 16.07.2007
Device
TC1766
Microcode
V23, V24, V25, V27
This Flash Firmware Status Sheet describes the Flash properties of the devices
depending on the implemented microcode version. Deviations from the current
user documentation which are device step specific but not Flash firmware
related are documented in the current Errata Sheet.
Table 1
Current Documentation
TC1766 User's Manual
V1.1
Aug. 2005
TC1766 Data Sheet
V0.7
Feb. 2007
TriCore 1 Architecture
V1.3
Oct. 2005
The 1-byte microcode version number is stored at the bit locations 103-96. This
byte is accessible at LDRAM address D000 000CH after each reset, and subject
to be overwritten by user data at any time.
The version number is defined as “Vsn”, contained in the byte as:
•
•
s = step code (highest 4 bit, hex number). A-step = 1, B-step = 2, and so on.
n = code version number (lowest 4 bit, hex number) belonging to the step
(beginning with zero for every new step code).
Example: V21, V23, V3A, V3F, etc
TC1766, V23, V24, V25, V27
1/12
Rel. 1.6, 16.07.2007
Flash Firmware Status Sheet
History List / Change Summary
1
History List / Change Summary
Table 2
History List
Version
Date
1.0
24.10.2005
1.1
15.12.2005
1.2
02.03.2006
1.3
28.04.2006
1.4
22.12.2006
1.5
02.04.2007
1.6
16.07.2007
Table 3
Microcode version history
Remark
Microcode
version
Changes
V23
Improved Functional Erase Stability vs. Voltage & Temp
Range
V24
Write Delayed by Erase Function fixed; Erase & Program
Verify Features
V25
Prog Time Improvement
V26
Not a productive version
V27
Boot fix for an aborted logical sector erase
The microcode version number does not use a consecutive ascending
sequence, so gaps inside this numeration can occur.
TC1766, V23, V24, V25, V27
2/12
Rel. 1.6, 16.07.2007
Flash Firmware Status Sheet
History List / Change Summary
Table 4
Functional Deviations
Functional
Deviation
Short Description
FIRM_TC.004
DFlash write delayed by erase operation
4
FIRM_TC.005
Program While Erase can cause fails in the
sector being erased
4
FIRM_TC.006
Erase and Program Verify Feature
5
FIRM_TC.007
Boot fix for an aborted logical sector erase
6
FIRM_TC.008
Erase Algorithm Abnormality for LS0..3
Table 5
Chg Pg
New 7
Deviations from Electrical- and Timing Specification
AC/DC/ADC
Deviation
Short Description
Chg Pg
FIRM_TC.P001
Longer Flash erase time
Upd
ate
FIRM_TC.P002
Page programming time
Table 6
Hint
9
10
Application Hints
Short Description
Chg Pg
None
TC1766, V23, V24, V25, V27
3/12
Rel. 1.6, 16.07.2007
Flash Firmware Status Sheet
Functional Deviations
2
Functional Deviations
FIRM_TC.004 DFlash write delayed by erase operation
In case of an ongoing erase operation to one DFlash bank, any program
request to the alternate DFlash bank will be delayed until the ongoing erase
operation is fully completed. This behaviour is due to a Flash microcode issue
and does not affect in any other way the Flash functionality or reliability.
This erratum is valid for microcode <= V23.
Workaround
None.
FIRM_TC.005 Program While Erase can cause fails in the sector being
erased
V24 and V25 are affected by this functional bug:
Per call of a `Program while Erase` (Erase Suspend Feature) the following
errors may be visible after the suspended erase is terminated in the erased
sector:
•
•
either 1 page is not properly erased. This error is oftenly detectable by
reading the sector (some cells in the page read 1) but also some hard to
detect weak 0 bits might be generated.
or FSR.VER might show up: This error flag indicates that some overerased
bits inside one page of the erased sector remained unrecovered (this
overerased state is not customer-detectable, e.g. it will read 0 as expected)
and can cause subsequent program operations to the erased sector to be
unsuccessfull, (i.e.FSR.VER can appear again after programming a page
(Prog Verify Fault) and the bits intented to be programmed might read 0).
This state can only be left by an (successfull) re-erase.
The program result of the `program while erase` itself is not affected and will be
valid.
TC1766, V23, V24, V25, V27
4/12
Rel. 1.6, 16.07.2007
Flash Firmware Status Sheet
Functional Deviations
Workaround
1. re-erase a sector if the program while erase became necessary (until the
erase process was executed without any program while erase call).
2. do not use Program while Erase
FIRM_TC.006 Erase and Program Verify Feature
Starting microcode V24, any internal errors detectable by the FSI state machine
during erase sector or program page sequences will be indicated by activation
of the FSR.VER bit before busy status is deactivated. FSR.VER errors will
appear typically if operations are carried out violating device specs (exceeding
endurance, operating temperature, supply voltages).
FSR.VER can be indicated in seldom cases in absense of functional or reliability
problems. Always consider that even if a VER would indicate a severe problem,
it is usually not reasonable to stop an application in the field, but wait for
functional consequences to show up.
Recommendations
These recommendations are intended for optimization of functional safety
applying the current generation of the VER feature (optional to customer
application).
•
•
Recommended action for erase-VER event in field / end of line erase:
a) Immediate clear status, to catch other successive events and distinguish
from prog-VER
b) Re-erase until VER disappears (max up to 3 times in sequence;
afterwards ignore), but take special care to fullfill operating conditions
(total sector endurance, voltage, frequency, temperature not exceeded).
c) Regardless from VER: Infineon recommends to apply, in case of "end of
line" flashing or firmware update, a tight-0 check by SBE counting (or
preferably a tight 0+1 check for the whole sector after sector is
programmed) to determine ECC off fail rate: if single bit error (SBE) count
is below 10 per sector, the risk of an incorrigible double bit error (DBE)
throughout retention / further operating life is considered still negligible.
Recommended action for prog-VER event in field / end of line programming:
TC1766, V23, V24, V25, V27
5/12
Rel. 1.6, 16.07.2007
Flash Firmware Status Sheet
Functional Deviations
a) Immediate clear status, to catch other successive events and distinguish
from erase-VER
b) Never reprogram the same page (disturb budget violation) without erase
c) Count VER occurrences for each individual sector since last erase (in
SRAM in volatile manner after each powerup). Up to three VER events
occuring in a sector are tolerable, but take special care to fullfill operating
conditions (total sector endurance, voltage, frequency, temperature not
exceeded).
d) Regardless from VER: Infineon recommends to apply in case of "end of
line" flashing or firmware update a tight 0+1 check (SBE event counting)
for the written page, or preferably a tight 0+1 check for the whole sector,
after sector is programmed: if single bit error (SBE) count is below 10 per
sector, the risk of an incorrigible double bit error (DBE) throughout
retention / further operating life is considered still negligible.
e) If the first program into a freshly erased sector shows prog-VER,
preferably reerase and reprogram the sector (reerase no more than once
in case of such prog-VER). Make sure not to program into sectors where
erase operation was aborted (a prog-VER will be indicated when
programming to an "aborted erase" sector left in overerase) and take
special care to fullfill operating conditions.
FIRM_TC.007 Boot fix for an aborted logical sector erase
In case of an aborted logical or physical sector erase, cells might be in an overerased state. As the presence of a partially erased / over-erased state of the
flash is not reliably detectable by the user, a reerase is mandatory whenever an
erase abortion cannot be excluded.
Please also refer to the application hint: Flash_TC.H005
In case of an aborted logical sector erase other logical sectors may become
unreadable. As a consequence the boot code or alternate boot info might be
unreadable and the device isn’t booting customer code anymore.
TC1766, V23, V24, V25, V27
6/12
Rel. 1.6, 16.07.2007
Flash Firmware Status Sheet
Functional Deviations
Starting with uCode v27 the following functional enhancement will help to keep
the customer boot code accessible:
- an aborted logical sector erase will be detected after reset
- in presence of over-erased cells the affected sector will be fully programmed.
The flash boot time will be considerably (<10ms) prolonged in this case
- the ’program all’ functionality to an over-erased sector allows to recover the
readability of the remaining logical sectors
- the ’fixed’ logical sector will be read as all ’1’ afterwards
The FSR.VER bit will flag the detection of an aborted sector erase and it’s
recovery or indicate an endangered system integrity. This flag can be reset by
the clear status command.
Workaround
None
FIRM_TC.008 Erase Algorithm Abnormality for LS0..3
V25 microcode is affected by the following functional bug: over-erase algorithm
for erase logical sectors 0..3 applies erroneously erase verify and softprogramming substeps to extended memory range (may even affect
neighboring sectors).
The consequences are:
•
•
the logical sector to be erased will always be physically erased
unnecessarily strong. This state will be recovered by the soft-programming
step, but erase time is prolonged and in LS0..3 in seldom cases cell
abnormalities can be emphasized/stimulated that cause up to 31 (bitlineoriented, e.g. offset address is 100H) single bit errors reading 1 (in an ECC
correctable way) in the erased logical sector accompanied with FSR.VER
indication.
neighboring sectors will not be unintentionally erased, but may be impacted
by disturb (zeroes might get slightly weaker) and additional soft-
TC1766, V23, V24, V25, V27
7/12
Rel. 1.6, 16.07.2007
Flash Firmware Status Sheet
Functional Deviations
programming resulting in potential single bit errors (SBE). The potentially
SBE-impacted area for logical sectors 0 to 3 is starting at next logical
sectors address SA+4000H (i.e. 004000H, 008000H, 00C000H, 010000H)
and is 1C000H wide (because erroneously the size of the whole physical
sector 20000H is applied instead of the logical sector's size 4000H).
Workaround
Either:
•
•
Do not use logical sector erase LS0..3 (but physical sector erase instead),
if applicable.
Disregard VER & tolerate SBE state, if less than 10 SBEs after update.
TC1766, V23, V24, V25, V27
8/12
Rel. 1.6, 16.07.2007
Flash Firmware Status Sheet
Deviations from Electrical- and Timing Specification
3
Deviations from Electrical- and Timing
Specification
FIRM_TC.P001 Longer Flash erase time
The Flash firmware-dependent maximum sector erase times are shown in the
following table. Sector erase time is proportional to Program resp. Data Flash
sector size (e.g. erase time of a 512 kB Prog Flash sector is twice the specified
for a 256 kB Prog Flash sector erase time) and may increase beyond the given
limits at lower CPU operating frequencies.
Table 7
Firmware dependent max Flash erase times
Flash & sector size
Microcode version tERP / tERD (erase time)
Program Flash, 256 kB V23
18 s
V24
18 s
V25
8 s1); erase time may exceed
the given limits below room
temperature (+20°C ... -40°C:
10s)
V27
TC1766, V23, V24, V25, V27
8s; erase time may exceed the
given limits below room
temperature (+20°C ... -40°C:
10s)
9/12
Rel. 1.6, 16.07.2007
Flash Firmware Status Sheet
Deviations from Electrical- and Timing Specification
Table 7
Firmware dependent max Flash erase times (cont’d)
Flash & sector size
Microcode version tERP / tERD (erase time)
Data Flash, 16 kB
V23
2.2 s
V24
2.2 s
V25
1.0s; erase time may exceed
the given limits below room
temperature (+20°C ... -40°C:
1.25s)
V27
1.0s; erase time may exceed
the given limits below room
temperature (+20°C ... -40°C:
1.25s)
1) When erasing a logical sector (any of LS0..3), erase time may be extended up to 2
seconds (frequency dependent) due to FIRM_TC.008.
Maximum erase time at CPU operating frequencies below 80 MHz can be
calculated according to the following table:
Table 8
Relative erase time increments
Frequency [MHz]
Increment
80
0%
66
4%
60
6%
40
12%
20
30%
Example: Maximum 256kB Program Flash Erase Time for V25 at 60 MHz is 8s
* 106% = 8.48s.
FIRM_TC.P002 Page programming time
The specified page programming time is 5 msec. The actual microcode
dependent programming time is shown in the following table:
TC1766, V23, V24, V25, V27
10/12
Rel. 1.6, 16.07.2007
Flash Firmware Status Sheet
Deviations from Electrical- and Timing Specification
Table 9
Maximum Flash page programming time
Flash
Microcode version
tPR (programming time)
Program Flash
V23
8 ms
V24
8 ms
V25
5.6 ms
V27
5 ms (compliant with Data Sheet)
Data Flash
V23
8 ms
V24
8 ms
V25
5.6 ms
V27
5 ms (compliant with Data Sheet)
TC1766, V23, V24, V25, V27
11/12
Rel. 1.6, 16.07.2007
Flash Firmware Status Sheet
Application Hints
4
Application Hints
None.
TC1766, V23, V24, V25, V27
12/12
Rel. 1.6, 16.07.2007