Samsung S3F80JB - Manual (Page 343)

Important Note S3F80JB
1
1. ANALYSIS RESULT
When serial writing programming on S3F80JB, only port1.4,1.5,1.6,1.7 are affected by SDAT signal. This
phenomenon is only port1.4,1.5,1.6,1.7 issues and in normal operating mode it never be occurred.
2. ANALYSIS OF PHENOMENON
2.1 FOR SERIAL PROGRAMMING MODE
The S3F80JB/9 is needed to nRESET pin = “0(GND)” & TEST pin = “1(VDD)”
P1.4~1.7
When nRESET pin = “0(GND)” & TEST pin = “1(VDD)”
In the Figure 1, “SDAT” signal effects to “outdis” and “data” signal ( See 1 )
But, because MUX level is “unknown” ( See 2 ), “outdis” and “data” is toggling.
This toggling phenomenon is only occurred to port1.4,1.5,1.6,1.7 on S3F80JB