Memory Contents - Nera Inmarsat-c Service Manual

4) Back up
I/O interface of U7 (FDC37C935APMQFP), which has RTC function and the function of the
interface of the printer and FDD, and S-RAM of U3 and U4 (K6T1008C2E) are backed up
by Lithium battery. The RTC data is used as a time stamp;
- [F1]-3: Save
- [F6]: Log

2.3.3 Memory contents

Table 2.3.8 lists the volume and the memorized contents of each memory.
Board Parts number
RF CON U22: S-RAM
/CPU
U15: EEROM
(16P208)
U14: CPU
TERM U3and U4: S-RAM
CPU
U14: Flash ROM
(16P0209)
U22 and U23: D-RAM
U13: D-RAM
U28: CPU
Note)
*: S-RAM, U22 on RF CON/CPU board is
(2.2F) for 72 hours as well as optional GPS board, GN-79.
**: S-RAM, U3 and U4 on TERM CPU board is
(BATT-1: CR2450 F2ST2L) for more than 2 years. The battery life is about 5 years.
Model
CY62146VLL 256 kbyte
CAT25C64P 64 kbits
HD64F7065A 256 kbyte
8 kbyte
K6T1008C2E (128 Kx8)x2
MBM29F800BA 8 M bits
MSM5118165D F 1 M (word)×16 (bit)x2
MSM5118165D F 1 M (word)×16 (bit)
HD6417615 AF 8 k bytes
b acked up by the charge of the capacitor, C90
2-26
2.3 Terminal unit, IC-215
Table 2.3.8 Memory volume
Volume
Backup (C90)*
Serial EEPROM
Built-in ROM
Built-in RAM
Backup (BATT-1)**
Built-in RAM
b acked up by the lithium battery
Remarks