SBE HighWire HW400c/2 - Manual (Page 74)

HighWire HW400c/2 User Reference Guide Rev 1.0
R)
king the programming
tatus after a write operation.
to write EEPROM word addresses 0x00-0x0F without the FAC jumper
stalled results in a write error, setting WERR bit. These addresses are reserved for
Ta 9
Bit 7 Bit 5 Bit 3 Bit 2 1 Bit 0
4.2.27 EEPROM Operation/Status Register (EOS
The EEPROM Operation and Status Register is a Read/Write register. It is used for
initiating a read or write operation to the EEPROM, and chec
s
Bits 0-3 are self-clearing, and bit 7 clears when the next operation is started.
Attempting
in
SBE board ID identification and are programmed by SBE during board
manufacturing.
ble 57. EEPROM Operation/Status Register (EOSR) Offset Address 0x2
Bit 6 Bit 4 Bit
WERR d Reserved ERD EWDS R EWEN Reserve EBSY EW
R R R R W W W W
EWEN: Writing a “1” to this bit initiates a EWEN cycle, required before a write.
EWR: Writing a “1” to this bit initiates a write, using the EAR address and
RD: Writing a “1” to this bit initiates a read, using the EAR address and
EBSY = 0 EEPROM is ready for next write operation
WE 0 Write operation completed successfully
For m nsult the device data sheets. Devices supported include
EDR data.
EWDS: Writing a “1” to this bit initiates a EWDS cycle, required after a write.
E
EDR data.
= 1 EEPROM is busy writing (no reads or writes allowed)
RR =
= 1 Write error, operation not completed
ore information on the serial EEPROM, co
Atmel AT93C66A, Microchip 93LC66C, and ST Microelectronics M93C66.
October 10, 2006 Copyright 2006, SBE, Inc. Page 62