Address Map - NEC startWARE-GHS-Ravin-E User Manual

5.2 Address Map

Ravin-E occupies 16 MB (when using the SRAM-like bus interface) or 32 MB (when using the PCI-inter-
face) in the address space of the host CPU. In both cases, the upper 8 kB of this range are reserved for
the on-chip status and command registers, while the rest of these address spaces is directly mapped to
access the frame buffer.
Even though the host interface is limited to 16 or 32 MB access size at a time, Ravin-E can access a
total frame buffer of up to 64 MB. The window that is visible from the host CPU can be moved over the
total frame buffer by specifying the frame buffer start address in the HostCpuBaseAddr. The start
address is aligned to a 2 kB base address.
When the startWARE-GHS-Ravin-E board is used together with the startWARE-GHS-V
then the following address mapping in the V
JP2 selects CS0:
JP2 selects CS1:
See page 32 for JP2 settings.
Note that the sizes of the V
address spaces are mirrored at 0x0B00 0000 ~ 0x0BFF FFFF and 0x0D00 0000 ~ 0x0DFF FFFF
respectively.
34
Chapter 5 Appendix
4131 I/O address space applies:
R
0x0A00 0000 ~ 0x0AFF FFFF
0x0C00 0000 ~ 0x0CFF FFFF
4131 I/O address spaces are 32 MB each, and therefore the above 16 MB
R
User's Manual U17316EE1V0UM00
4131 board,
R