Collection of Product FAQs
Author: Kano Tomoo
Date: 98/11/12 (Thursday) 10:17 (modified: 99/01/13)
<Information level>
B:
For Distri & Rep (Printing N.G.)
B: Technical
Index:
<Product>
Division name: 01 IC
Category 1:
12 Memory
Category 2:
Cal. No.:
2. Serial EEPROM
Overall
Related documents:
Question:
False-writes in S-93C, S-29 series: inadvertent activation of CS (malfunction)
Answer:
Inadvertent writing in the S-29 series
In the S-29 series, when a CS input is inadvertently activated during a write command, undefined data
may be written. Relevant timings are shown below.
A command is composed of the following: “start bit + two command bits + address + (data).”
The figure below shows the timings in which commands are set (In the figure, the portion denotes the
rising edge of SK.)
In the case of a write command, after a final address has been input and while 16-bit data is being input,
undefined data is written when the CS input is changed from H to L.
Activation of SK obtaining A
tCDS
[WRITE]
VERIFY
CS
4
7
9
SK
1
2
3
5
6
8
10
25
0
1
A5 A4 A3 A2 A1 A0 D15
Hi-Z
D0
1
DI
tSV
tHZ1
Hi-Z
busy
ready
DO
tPR
Case in which, during a command entry, CS is changed from H to L with a timing that differs by a
predetermined minimum number of clocks.
39
SII [ SEIKO INSTRUMENTS INC ]
