ATF1504BE-5AX44 Просмотр технического описания (PDF) - Atmel Corporation

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производитель

ATF1504BE-5AX44

High-performance CPLD

Atmel Corporation 

Figure 5-2. Configuration of ATF1504BE Device Using a Processor and Memory

ATF1504BE

CPLD Device

TCK

TDO

TMS

TDI

Serial Data

Processor

Data

Address

Memory

5.3 Direct Reconfiguration Access – DRA

This reconfiguration mode allows the user to directly modify the internal static registers of the

CPLD without affecting the configuration data stored in the embedded memory. It is more useful

in cases where immediate and temporary context change in the function of the hardware is

desired.

The embedded configuration memory in the ATF1504BE does not change when a new set of

configuration data is passed to the ATF1504BE using the DRA mode. Instead, the internal static

registers of the CPLD are directly written with the data entering the device via the JTAG port. In

other words, it's a temporary change in the function performed by the CPLD since a power

sequence results in the device being configured again by the data stored in the embedded

memory.

5.4 ISP Programming Protection

The ATF1504BE has a special feature that locks the device and prevents the inputs and I/O

from driving if the programming process is interrupted for any reason. The I/O pins default to

high-Z state during such a condition.

All ATF1504BE devices are initially shipped in the erased state, thereby making them ready to

use for ISP.

12 ATF1504BE

3637B–PLD–1/08

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