Panasonic KX-TDA6181X, Service Manual, Page: 15 / 71

7 CIRCUIT OPERATIONS
7.1. CONTROL-SYSTEM CIRCUIT
7.1.1. CPU Peripherals
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CPU (System clock: 12.288 MHz)......IC401
Data bus: 16bit, Address bus: 23bit
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• •
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Flash ROM (512Kbyte)......IC402
Flash memory consists of two areas: boot space and administration space.
Administration program can be rewritten through downloading.
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• •
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SRAM (128Kbyte)......IC403
Used for the data buffer for CPU work area.
• • • • Reset
Resets of an ELCOT16 card are roughly classified into the two kinds: ASIC reset and LPR reset.
After the release of the ASIC reset, the LPR reset is released by the soft reset from the side of the main card and the LPR
program is booted.
Type of reset Reset method Specification
ASIC reset ASIC reset is reset under the AND condition of reset signals (negative logic)
listed below.
Power-on reset Reset by reset IC
Hard reset from the main bus Reset by EC_RST signal
Soft reset from the main bus Released after the specified time
LPR reset Soft reset from the main bus Low active
Reset pulse width: 1.6 microseconds or more
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LED Operation status indicating LED (Two colors)
OFF: Fault
Red ON: Fault (RESET included)
Green ON: Normal (Line not in use)
Green Flash (60/minute): Normal (Line in use)
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KX-TDA6181X