Owner manual

VM162/VM172Chapter 2 Functional Description
Juli 23, 1997 Page 2- 27© PEP Modular Computers
Notes:
Reserved Pins
1) On a standard VM162/VM172 board, these signals are already used for UART ports at BU7 and
BU8.
2) On a standard VM162/VM172 board, these signals are used for SPI to which the EEPROM is
already connected. PB0 is chip select of the EEPROM.
3) On PA13, a 24 MHz clock signal is routed via jumper J11. This signal is always needed for PEP
standard software (serial drivers).
Dual Functioning Signal Pins
4) These signals are routed both to the base board SI Interface connector (ST5C) and the CXC con-
nector and can only be used by one or the other and not both at the same time.
Due to this, a conflict exists if the SCC4 port is to be used with the SI232 piggyback and CXC boards
(such as CXM-SIO3), as both boards access this port. The SCC4 port can, therefore, not be used at
the
same time by SI piggybacks and CXC boards.
CXC
Function
Pin Nr.
68302 HW
Compatible
68(EN)360
Port
Comment
user defined a5 No PB0 Used on board SPI SEL for EEPROM.
Cannot be used on CXC
See note 2
a6 No PB1 SPI Clk: can be used if an ‘SPI SEL’
other than PB0 is used
a8 No PB2 SPI TxD: can be used if an ‘SPI SEL’
other than PB0 is used
a9 No PB3 SPI RxD: can be used if an ‘SPI SEL’
other than PB0 is used
a10 No PB8 See 68360 User Manual
b11 No PB10 Used on board SMC2 (Transmit)
See note 1
c1 No PB6 Used on board SMC1 (Transmit)
See note 1
c4 No PB11 Used on board SMC2 (Receive)
See note 1
c10 No PB7 Used on board SMC1 (Receive)
See note 1