W551C002 Datasheet, PDF (9/15 Pages) Winbond – Serial Voice Memory

W551Cxxx Data Sheet
3.3 W551Cxxx Self-test Mode
In normal read mode, the TEST pin is internally pulled high, and the TEST_OUT pin is in logic ' 1 ' state.
When the TEST pin is pulled low, the W551Cxxx enters the "self-test mode". In this mode, the self-test process is
started at the falling edge of the TEST signal. The self-test process accumulates each byte (8 bit) of voice memory
content from address 00000h to 7FFFFh. If the accumulated result is 00h, a logic ' 0 ' will be output from
TEST_OUT pin. Or else, a logic ' 1 ' signal will be output from TEST_OUT pin.
TEST
TEST
_OUT
TEST
_OUT
T_TEST
For "Correct" result
For "Incorrect" result
End of test
Winbond Electronics Corp.
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Release Date: January 2, 2001