EM4205-EM4305
Disable Command
The Disable command is accepted when the Disable bit
(co23) of Configuration Word is set to 1.
format (see table 12), which is not the same as in Default
Read where only the data from the EEPROM is read.
When the Read Word command is not accepted (parity
error), error pattern 00000001 is sent and the IC returns
to Default Read mode.
In Disable command, an all-1 data field is sent as the
command argument using the structure described in
Table 12 (45 bits including parity bits, where parity bits
are all 0). Command structure is therefore similar to
Login command.
Protect Command
The Protect command is used to protect EEPROM words
0 to 13 from being modified using Write Word command.
In the Protect command, a 32 bit word is sent according
to Data structure defined in table 12. Bits D0 to D14
correspond to Protection bits pr0 to pr14 (see Table 5).
Bits D31 to D15 are don’t care.
When this command is detected, the chip stops all
operations until next power-up.
If the Disable command is not accepted (Disable bit set
to 0, parity error or some other data then all-1), error
pattern 00000001 is sent and the IC returns to Default
Read mode.
When the Protect command is successfully processed,
the IC checks whether there is enough power available
to program EEPROM (Power check) and updates
Protection Words according to procedure which is
described in paragraph "Words 14 and 15: Protection
words”. When this is finished preamble pattern 00001010
is sent and the chip returns to Default Read mode.
Error during Command Detection
If a command code, which is not supported, or a
command parity bit error is detected, the IC exits
command processing and returns to Default Read mode
without sending any message.
If the Protect command is not accepted (parity error or
Power Check fail), Protection Words are not modified, error
pattern 00000001 is sent and the IC returns to Default
Read mode.
Write Word
EM4205/4305
Default Read
Preamble
Default Read
READER
Timings
"0101"
Address
Data
TPC
TWEE
Read Word
EM4205/4305
Default Read
Default Read
Default Read
Default Read
Preamble
Read Word
Default Read
READER
Timings
"1001" Address
TPP
Login
EM4205/4305
Preamble
Default Read
READER
Timings
"0011"
"1100"
"1010"
Password
TPP
Protect
EM4205/4305
Preamble Default Read
READER
Timings
Protection
"all1" data
TPC
TPR
Disable
EM4205/4305
Disabled Mode
READER
Timings
Figure 12
11
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Copyright 2013, EM Microelectronic-Marin SA
4205-4305-DS-01.doc, Version 4.0, 22-Oct-13
EMMICRO [ EM MICROELECTRONIC - MARIN SA ]
