3. Read the PRETRY and ERETRY bits in the EEPROM Support Control and Status (EESUPP)
register. If either of the bits are set, return an error, else continue.
4. Reset the EEPROM module using the EEPROM Software Reset (SREEPROM) register at
offset 0x558 in the System Control register space.
5. Insert delay (6 cycles plus function call overhead).
6. Poll the WORKING bit in the EEPROM Done Status (EEDONE) register to determine when it is
clear. When WORKING=0, continue.
7. Read the PRETRY and ERETRY bits in the EESUPP register. If either of the bits are set, return
an error, else the EEPROM initialization is complete and software may use the peripheral as
normal.
Important: Failure to perform these initialization steps after a reset may lead to incorrect operation
or permanent data loss if the EEPROM is later written.
If the PRETRY or ERETRY bits are set in the ESUPP register, the EEPROM was unable
to recover its state. If power is stable when this occurs, this indicates a fatal error and
is likely an indication that the EEPROM memory has exceeded its specified lifetime
write/erase specification. If the supply voltage is unstable when this return code is
observed, retrying the operation once the voltage is stabilized may clear the error.
The EEPROM initialization function code is named EEPROMinit( ) in TivaWare, which can be
downloaded from http://www.ti.com/tivaware.
8.2.5 Bus Matrix Memory Accesses
The following table identifies the Bus Masters and their access to the various memories on the bus
matrix.
Table 8-5. Master Memory Access Availability
External Memory
Access (via EPI)
EEPROM
Access
SRAM AccessROM AccessFlash AccessMaster
YesYesYesYes (read-only)YesCPU Instruction Bus
YesYes-Yes (read-only)YesCPU Data Bus
YesYesYes-Yes (read-only,
Run-Mode-only)
µDMA
--Yes--Ethernet Module
--Yes--USB
8.3 Register Map
Table 8-6 on page 622 lists the ROM Controller register and the Flash memory control registers. The
offset listed is a hexadecimal increment to the register's address. The Flash memory register offsets
are relative to the Flash memory control base address of 0x400F.D000. The EEPROM registers
are relative to the EEPROM base address of 0x400A.F000. The ROM control and Flash memory
protection register offsets are relative to the System Control base address of 0x400F.E000.
621June 18, 2014
Texas Instruments-Production Data
Tiva
™
TM4C1294NCPDT Microcontroller
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