Functional Description
MEN Mikro Elektronik GmbH
56
20A014-00 E2 – 2007-08-16
2.16.4
VME Slave Mapping
The PCI space, 1 MB SRAM, the internal RAM and all registers are accessible by
the VMEbus. The registers and the internal RAM is a 4-kB block, which is
accessible in A16 mode only. This block is mapped to the slave base address for
A16 mode. The SRAM can be mapped to the A24 and A32 base address, whereas
the SRAM is mirrored in A32 mode. The PCI space is also mapped to the A24 and
A32 space. The size of the A24/A32 windows is configurable in the corresponding
Mask Registers.
Table 23.
VMEbus slave address windows
2.16.5
SRAM
The SRAM is accessible from the PCI and VMEbus side. From the VMEbus side,
the base address is defined in the
Slave Control Registers
for A24 or A32 (in A32
mode the SRAM is mirrored!).
The SRAM has a size of 1 MB. It is accessible via block and standard transfers (user
and supervisor space).
VME Slave
Access
Size
Address
Function
A16
72 bytes
0x 000 .. 0x 050
VME Bridge Control Registers
A24
64KB..
1MB
0x 0 0000 ..
0x F FFFC
Local SRAM
64KB..
1MB
0x 0 0000 ..
0x F FFFC
PCI Space
A32
1MB
0x 0000 0000 ..
0x 000F FFFC
Local SRAM
1MB..
256MB
0x 0000 0000 ..
0x 000F FFFC
PCI Space
