Digital Spectrum TMS320C6413, Техническое описание

Страница: 20 / 78

Spectrum Digital, Inc
2-2 TMS320C6413/C6418 EVM Module Technical Reference
2.1 CPLD (Programmable Logic)
The C6413/C6418 EVM uses an Altera EPM3128TC100-10 Complex Programmable
Logic Device (CPLD) device to implement:
• Memory-mapped control/status registers that allow software
control of various board features.
• Address decode and memory access logic.
• Control of the daughter card interface and signals.
• SPI for LCD serial interface.
• Assorted "glue" logic that ties the board components together.
2.1.1 CPLD Overview
The CPLD logic is used to implement functionality specific to the EVM. Your own
hardware designs will likely implement a completely different set of functions or take
advantage of the DSPs high level of integration for system design and avoid the use
of external logic completely.
The EMIF on theC6413/C6418 can support several heterogeneous memory types with
a glueless interface. However, to reserve CE2 and CE3 for potential daughter-card use
on the EVM, CE1 is split to include the Flash in its bottom half and the CPLD
memory-mapped registers in its top half. The address decode logic is used to
implement the split.
The CPLD implements simple random logic functions that eliminate the need for
additional discrete devices. In particular, the CPLD aggregates the various reset
signals coming from the reset button and power supervisors and generates a global
reset.
The EPM3128TC100-10 is a 3.3V (5V tolerant), 100-pin QFP device that provides
128 macrocells, 80 I/O pins, and a 10 ns pin-to-pin delay. The device is
EEPROM-based and is in-system programmable via a dedicated JTAG interface
(a 10-pin header on the EVM). The CPLD source files are written in the industry
standard VHDL (Hardware Design Language) and are included with the EVM on the
installation CD-ROM.