SM320F2812-HT
SGUS062B
–
JUNE 2009
–
REVISED JUNE 2011
www.ti.com
single step through non-time critical code while enabling time-critical interrupts to be serviced without
interference. The F2812 implements the real-time mode in hardware within the CPU. This is a unique
feature to the F2812, no software monitor is required. Additionally, special analysis hardware is provided
which allows the user to set hardware breakpoint or data/address watch-points and generate various user
selectable break events when a match occurs.
3.2.5
External Interface (XINTF)
This asynchronous interface consists of 19 address lines, 16 data lines, and three chip-select lines. The
chip-select lines are mapped to five external zones, Zones 0, 1, 2, 6, and 7. Zones 0 and 1 share a single
chip-select; Zones 6 and 7 also share a single chip-select. Each of the five zones can be programmed
with a different number of wait states, strobe signal setup and hold timing and each zone can be
programmed for extending wait states externally or not. The programmable wait-state, chip-select, and
programmable strobe timing enables glueless interface to external memories and peripherals.
3.2.6
Flash
The F2812 contains 128K
×
16 of embedded flash memory, segregated into four 8K
×
16 sectors, and six
16K
×
16 sectors. The F2810 has 64K
×
16 of embedded flash, segregated into two 8K
×
16 sectors, and
three 16K
×
16 sectors. The device also contains a single 1K
×
16 of OTP memory at address range 0x3D
7800 - 0x3D 7BFF. The user can individually erase, program, and validate a flash sector while leaving
other sectors untouched. However, it is not possible to use one sector of the flash or the OTP to execute
flash algorithms that erase/program other sectors. Special memory pipelining is provided to enable the
flash module to achieve higher performance. The flash/OTP is mapped to both program and data space;
therefore, it can be used to execute code or store data information.
NOTE
The F2812 Flash and OTP wait states can be configured by the application. This allows
applications running at slower frequencies to configure the flash to use fewer wait states.
Flash effective performance can be improved by enabling the flash pipeline mode in the
Flash options register. With this mode enabled, effective performance of linear code
execution is much faster than the raw performance indicated by the wait state configuration
alone.
The
exact
performance
gain
when
using
the
Flash
pipeline
mode
is
application-dependent. The pipeline mode is not available for the OTP block.
For more information on the Flash options, Flash wait-state, and OTP wait-state registers,
see the TMS320x281x System Control and Interrupts Reference Guide (
SPRU078
).
3.2.7
L0, L1, H0 SARAMs
The F2812 contains an additional 16K
×
16 of single-access RAM, divided into three blocks (4K + 4K +
8K). Each block can be independently accessed hence minimizing pipeline stalls. Each block is mapped to
both program and data space.
3.2.8
Boot ROM
The Boot ROM is factory-programmed with boot-loading software. The Boot ROM program executes after
device reset and checks several GPIO pins to determine which boot mode to enter. For example, the user
can select to execute code already present in the internal Flash or download new software to internal
RAM through one of several serial ports. Other boot modes exist as well. The Boot ROM also contains
standard tables, such as SIN/COS waveforms, for use in math-related algorithms.
Table 3-3
shows the
details of how various boot modes may be invoked. See the TMS320x281x DSP Boot ROM Reference
Guide (
SPRS095
), for more information.
30
Functional Overview
Copyright
©
2009
–
2011, Texas Instruments Incorporated
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