Bruker AQS - Real Time Clock and NVRAM

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(98/12/10)
Address
Byte Format
3210
Read/WriteDestination
1F0A0014 MODE0 W ---xb
1F0A0014 MODE0 R ---xb
1F0A0018 MODE1 W ---xb
1F0A0018 MODE1 R ---xb
1F0A001C MODE2 W ---xb
1F0A001C MODE2 R ---xb
4. 2. 9. Real Time Clock and NVRAM
Notes
 The MK48T02 of SGS–Thomson is installed to implement these two
functions by one device.
 It is a 2K–Byte–Static–RAM with its eight upmost cells being reserved
as hold register for the real time clock information.
 The lower half of the 2 kbyte is normally protected and can only be writ-
ten by means of the special PAL device ”CU09Nx01 ” of the service
staff. So far, this range contains only the ”ethernet physical address”.
 Besides the timing registers, the upper half of NVRAM contains all the
other boot parameters read with ”printenv” and changed with ”setenv” in
the monitor program.
Device Codes
Address
Destination Read/Write
Byte Format
3210
1F00000x
to
1F006FFx
NVRAM range, lower half R xxxb
1F00700x
to
1F007F7x
NVRAM range, upper half R/W xxxb
1F007F8x Control Register R/W xxxb
1F007F9x Seconds R/W xxxb
1F007FAx Minutes R/W xxxb
1F007FBx Hour R/W xxxb
1F007FCx Day R/W xxxb
1F007FDx Date R/W xxxb