MAP electronics Cocerto-B Especificaciones descargar pdf (Pagina 33)

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Usage Notes and Known Design Exceptions to Functional Specifications

Advisory C28x Flash: Code Executing From the C28x Subsystem Flash May be Subject to

Unnecessary 1-Cycle Delays

Revision(s) Affected 0

Details Code executing from the C28x Subsystem Flash may be subject to unnecessary 1-cycle

delays. This delay will not occur more often than once every 8 instructions for code that

is composed of linear 32-bit opcodes with no pipeline delays (worst case). In practice,

the unnecessary delay occurs rarely since the C28x uses both 16-bit opcodes and 32-bit

opcodes.

This delay can occur when Flash wait states are set to "3" and the prefetch mechanism

is enabled. This delay does not occur when the wait states are set to "2" or "1" with

prefetch enabled.

Workaround(s) None. This is fixed in Revision A silicon.

Advisory C28x Flash: The SBF and BF Instructions Will Not Execute From Flash

Revision(s) Affected 0

Details When the flash prefetch is enabled, the SBF and BF instructions will not be correctly

fetched from the Flash.

Workaround(s) Compile the application code with the –me option to avoid the SBF and BF instructions.

This is fixed in Revision A silicon.

Advisory C28x Clocking: EALLOW Protection of C28x Clocking Registers Prevents Read of

Registers

Revision(s) Affected 0

Details The EALLOW protection of the C28x clocking registers prevents reads to these registers

(reads return 0x0000) in addition to preventing writes to the registers (expected behavior

of EALLOW-protection) when EALLOW is not set.

Workaround(s) Prior to reading C28x clocking registers, the application code must first execute the

“EALLOW” command.

This is fixed in Revision A silicon.

SPRZ357J–August 2011–Revised July 2014 F28M35x Concerto™ MCU Silicon Errata

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MAP electronics Cocerto-B Especificaciones Pagina 33