PEP Modular Computers 15311, User Manual

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VMEM-F1 Chapter 2 Functional Description
Page 2- 4
© PEP Modular Computers
July 30, 1997
2.2 Addressing Board Configuration Registers
The VMEM-F1 occupies 4 kByte in the VMEbus A16 address space (Short I/O) where the board con-
figuration registers are situated. The base address of this 4 kByte block is selected using a jumper (see
Chapter 3
Configuration for more details). It can be accessed in A16 supervisory or A16 non-privaleged
address space.
Memory base address, size, AM code and some board control/status functions can be programmed via
the board configuration registers. The memory base address register must be initialized before FLASH
memory access is enabled.
2.2.1 Board Configuration Register Address Map
General Board Registers Area
Special Board Registers Area
Name
Access
Type
Read/Write Address Offset (HEX)
Serial EEPROM control register Byte R/W (A16 base) + 3
Memory base address register Byte R/W (A16 base) + 7
Base address mask register Byte R/W (A16 base) + B
Address modifier code register Byte R/W (A16 base) + F
Name
Access
Type
Read/Write Address Offset (HEX)
Flash page register Byte R/W (A16 base) + 81
Board status register Byte R/W (A16 base) + 83
Interrupt vector register Byte R/W (A16 base) + 85
Interrupt control register Byte R/W (A16 base) + 87