CPC505
C P C 5 0 5 U s e r M a n u a l
40
© 2 0 2 2 F a s t w e l v . 0 0 1
MOV DX, 311H
MOV AL, 20H
OUT DX, AL
MOV DX,313h
MOV AL, 01H
OUT DX, AL ; enabling the batch mode
MOV DX, 312h
IN AL,DX ; reading data byte by the address 208h
…
IN AL,DX ; reading data byte by the address 209h
…
IN AL,DX ; reading data byte by the address 20Ah
…
MOV DX,313h
MOV AL, 00H
OUT DX, AL ; disabling the batch mode
3.4.3 FRAM memory with serial access
The module has a serial access FRAM memory chip on the SPI bus. This non-volatile memory is
used to store BIOS settings and user data. Access to the chip is possible through the registers of
the SPI controller (see subparagraph 3.4.1). The microchip size is 32 KB, the last Kbyte is
reserved for storing service data and BIOS Setup settings (not accessible to the user).
3.5 Devices on the local SMBus
The SMBus (System Management Bus) provides system monitoring and configuration functions.
The bus uses a two wire I
2
C™ interface. Below is a table of SMBus device addresses:
Table 3-17
– Addresses of devices on SMBus
#
SMB Address
DEVICE
1
04CH
Temperature sensor memory
2
0A4H
2 SPD memory module
3
0A0H
1 SPD memory module
4
0C4H
PCI-E Bridge PMC
5
0C2H
PCI-E Bridge Compact PCI
6
02AH
PECI-SMBUS Bridge
7
02EH
LM87 Hardware monitor
3.6 Battery
The CPC505 uses one 3.0 V lithium battery to power the real-time clock.
3.7 SATA SSD
A 32GB high performance SATA SSD drive is installed on the module. The drive is connected to
the SATA 3.0 interface. The drive can be disabled through the BIOS Setup settings.
