Akura AV26720-HD2 Especificaciones descargar pdf (Pagina 14)

Spectrum Digital, Inc

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TMS320C54XX Evaluation Module Technical Reference

2.1.1 Power Connector

The C54XX is powered by a 5 Volt only power supply which is available with the

module. The board requires 1 amp. The power is supplied via 2 millimeter jack J1. If

expansion boards are connected to the module a higher amperage power supply may

be necessary. The board also has a 3.3 and 2.5 volt regulator to provide power to the

lower voltage components.

2.2 TMS320C54XX Memory Interface

The EVM includes 192k Words of on board program ram memory and 64k words

of on board data ram memory, providing a total of 256k words of off chip static ram.

The board also features two 32k flash ROMs for boot loading.

It is important to remember that internal memory has a higher precedence than the

external memory. For more information on the memory in the device populated in your

EVM card please refer to Texas Instruments TMS320C54XX Users Guide. Futhermore,

it is important to take into account that external memory is affected by wait-states. Wait

state generation for off-chip memory space (data, program, or I/O) is done with the

Software Wait State Generation Register(SWWSR). To obtain one waitstate off-chip

memory bits in the SWWSR must be appropriately programmed. The board powers up

with 7 wait-states. The EVM board does not generate wait states via the ready signal

for external program and data memory accesses, only I/O accesses use the ready

signal.

External memory decode is done via U14 a GAL20V8. The generic array device selects

the RAM, FLASH ROM, or on board peripherals. The equations for the GAL are

included in Appendix A. The figure below shows a one wait state program space

memory read followed by a data space memory write.

The external Flash ROM is mapped into the upper 32K words of data and I/O space for

boot loading. Note that this memory requires multiple wait states. The main purpose of

this memory is to allow for the boot loading of programs via the C54XX’s internal boot

loader.

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Akura AV26720-HD2 Especificaciones Pagina 14