CDCE421 Datasheet, PDF (5/30 Pages) Texas Instruments – Fully Integrated Wide-Range, Low-Jitter, Crystal-Oscillator Clock Generator

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SDATA
001 xxxx xxxx
101 xxxx xxxx
111 xxxx xxxx
111 0101 0101
111 1111 0000
111 0000 0000
FUNCTION
Write to Word4 (State 2)^{(1) (2) (3)}
Write to Word5 (State 2)^{(1) (2) (3)}
State machine jump: All other patterns not defined as follows cause an exit to normal mode.
Jump: Enter EEPROM programming with EEPROM lock (State 2 → State 3)
Jump: Enter EEPROM programming without EEPROM lock (State 2 → State 4)
Jump: Exit EEPROM programming (State 3 or State 4 → State 1)
CDCE421
SCAS842 – APRIL 2007
Write
WORD 0
Write
WORD 1
th
11 Bit
Written
th
11 Bit
Written
SDATA =
100 xxxx xxxx
SDATA =
000 xxxx xxxx
Power Up:
Read
EEPROM &
Configure
Power Up Reset
Completed
State 1: IDLE
Normal
Operation
SDATA = 111011
Write
WORD 2
SDATA =
010 xxxx xxxx
th
11 Bit
Written
SDATA =
110 xxxx xxxx
SDATA =
111 1111 1111
State 2:
Programming
Mode
SDATA = 001100
60^th Clock Applied
State 5:
Read Back
Mode
Write
WORD 3
th
11 Bit
Written
SDATA =
001 xxxx xxxx
Write
WORD 4
th
11 Bit
Written
SDATA =
101 xxxx xxxx
SDATA =
111 0101 0101
th
11 Bit
Written
Write
WORD 5
State 4:
Programming
EEPROM
Locking
SDATA =
111 1111 0000
SDATA =
111 0000 0000
SDATA =
111 0000 0000
State 3:
Programming
EEPROM
No Locking
NOTE: In States 2, 3, 4, and 5, the signal pin CE is disregarded and has no influence on power down.
Figure 2. State Flow-Diagram of Single-Pin Interface
F0016-02
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