PEF22827EL-V11 Lantiq, PEF22827EL-V11 Datasheet - Page 97

• Manufacturer Part Number: PEF22827EL-V11
• Manufacturer: Lantiq

Specifications of PEF22827EL-V11

• Lead Free Status / RoHS Status: Supplier Unconfirmed

7.3.2
Access EEPROM for read and write operations through a set of user registers.
After firmware is loaded to EEPROM, if the write protect pin of the EEPROM is
connected correctly to the digital transceiver, the EEPROM is automatically write
protected. For connection instructions and to enable or disable this mechanism, refer to
the Reference Design and the API documents.
7.3.2.1
To write to the EEPROM, disable EEPROM write protection and do the following:
1. Write the EEPROM address into the EEP_ADDR register from 5F70
2. Write the number of data bytes to write into the EEP_LENGTH register at 5F72
3. Load the data into the EEP_DATA register, from address 5F74
4. Write the checksum byte into the EEP_CHKSUM register at 5F73
5. Write the appropriate value into the EEP_COMMAND register at 5FF6
6. Poll the EEP_COMMAND register until it shows 00
7. Read the EEP_STATUS register at 5FF7
7.3.2.2
To read from the EEPROM, carry out the following steps:
1. Write the EEPROM address into the EEP_ADDR register from 5F70
2. Write the number of data bytes to read into the EEP_LENGTH register at 5F72
3. Write 04
4. Poll the EEP_COMMAND register until it shows 00
5. Read the EEP_STATUS register at 5FF7
6. If the operation succeeded, read data from the
Preliminary Data Sheet
maximum length is 128 bytes for a 64-Kbyte EEPROM, and 64 bytes for 32-Kbyte
EEPROM.
checksum should be the 2’s complement of the arithmetic sum of EEP_ADDR,
EEP_LENGTH and the written EEP_DATA data.
“EEP_COMMAND” on Page
that the write operation is finished and the EEP_STATUS register is valid.
operation succeeded or failed, and the reason for failure. See
Page 213
maximum length is 128 bytes for a 64-Kbyte EEPROM, and 64 bytes for 32-Kbyte
EEPROM.
that the read operation is finished and the EEP_STATUS register is valid.
operation succeeded or failed, and the reason for failure. See
Page 213
address 5F74
Accessing EEPROM
Writing to EEPROM
Reading from EEPROM
H
to the EEP_COMMAND register at 5FF6
for a description of all possible EEP_STATUS values.
for a description of all possible EEP_STATUS values.
H
.
213.
97
H
H
. The value of EEP_STATUS shows if the
. The value of EEP_STATUS shows if the
EEP_DATA
H
H
H
.
(no operation), which indicates
(no operation), which indicates
Operation – Digital Block
register, starting from
H
“EEP_STATUS” on
“EEP_STATUS” on
through 5FF3
Rev. 1.1, 2005-01-30
H
. The value of the
H
H
through 5F71
through 5F71
VDSL6100i
PEF 22827
H
H
H
. See
H
. The
. The
.
H
H
.
.