CY8C5248LTI-030 Cypress Semiconductor Corp, CY8C5248LTI-030 Datasheet - Page 51

• Manufacturer Part Number: CY8C5248LTI-030
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY8C5248LTI-030

• Lead Free Status / Rohs Status: Compliant

9.3 Debug Features
The CY8C52 supports the following debug features:
9.4 Trace Features
The following trace features are supported:
9.5 SWV Interface
The SWV interface provides trace data to a debug host via the
Cypress MiniProg3 or an external trace port analyzer.
.
9.6 Programming Features
The SWD interface provides full programming support. The
entire device can be erased, programmed, and verified.
Designers can increase flash protection levels to protect
firmware IP. Flash protection can only be reset after a full device
erase. Individual flash blocks can be erased, programmed, and
verified, if block security settings permit.
9.7 Device Security
PSoC 5 offers an advanced security feature called device
security, which permanently disables all test, programming, and
debug ports, protecting your application from external access.
The device security is activated by programming a 32-bit key
(0x50536F43) to a Write Once Latch (WOL). The WOL must be
programmed at V
The Write Once Latch is a type of nonvolatile latch (NVL). The
cell itself is an NVL with additional logic wrapped around it. Each
WOL device contains four bytes (32 bits) of data. The wrapper
outputs a ‘1’ if a super-majority (28 of 32) of its bits match a
Document Number: 001-66236 Rev. *A
Halt and single-step the CPU
View and change CPU and peripheral registers, and RAM
addresses
Six program address breakpoints and two literal access
breakpoints
Data watchpoint events to CPU
Patch and remap instruction from flash to SRAM
Debugging at the full speed of the CPU
Compatible with PSoC Creator and MiniProg3 programmer and
debugger
Data watchpoint on access to data address, address range, or
data value
Software event monitoring, “printf-style” debugging
DDD
≤ 3.3 V.
PRELIMINARY
pre-determined pattern (0x50536F43); it outputs a ‘0’ if this
majority is not reached. When the output is 1, the Write Once NV
latch locks the part out of Debug and Test modes; it also
permanently gates off the ability to erase or alter the contents of
the latch. Matching all bits is intentionally not required, so that
single (or few) bit failures do not deassert the WOL output. The
state of the NVL bits after wafer processing is truly random with
no tendency toward 1 or 0.
The WOL only locks the part after the correct 32-bit key
(0x50536F43) is loaded into the NVL's volatile memory,
programmed into the NVL's nonvolatile cells, and the part is
reset. The output of the WOL is only sampled on reset and used
to disable the access. This precaution prevents anyone from
reading, erasing, or altering the contents of the internal memory.
You can write the key into the WOL to lock out external access
only if no flash protection is set (see
page 16). However, after setting the values in the WOL, you still
have access to the part until it is reset. Therefore, you can write
the key into the WOL, program the flash protection data, and
then reset the part to lock it.
If the device is protected with a WOL setting, Cypress cannot
perform failure analysis and, therefore, cannot accept RMAs
from customers. The WOL can be read out via Serial Wire Debug
(SWD) port to electrically identify protected parts. You can write
the key in WOL to lock out external access only if no flash
protection is set. For more information on how to take full
advantage of the security features in PSoC see the PSoC 5
TRM.
Disclaimer
Note the following details of the flash code protection features on
Cypress devices.
Cypress products meet the specifications contained in their
particular Cypress data sheets. Cypress believes that its family
of products is one of the most secure families of its kind on the
market today, regardless of how they are used. There may be
methods, unknown to Cypress, that can breach the code
protection features. Any of these methods, to our knowledge,
would be dishonest and possibly illegal. Neither Cypress nor any
other semiconductor manufacturer can guarantee the security of
their code. Code protection does not mean that we are
guaranteeing the product as “unbreakable.”
Cypress is willing to work with the customer who is concerned
about the integrity of their code. Code protection is constantly
evolving. We at Cypress are committed to continuously
improving the code protection features of our products.
PSoC
®
5: CY8C52 Family Datasheet
“Flash Security”
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