Sundance SMT310 v.1.6 - Manual (Page 14)

User Manual (QCF42); Version 3.0, 8/11/00; © Sundance Multiprocessor Technology Ltd. 1999
6 Shared Memory Resource
The shared memory on the SMT310 is 1 MB of SRAM, which can be accessed by the
PCI host and the TIM module. This allows applications to transfer data between the
host PC and the DSP at data rates approaching 100MB/s. The address of the shared
memory is shown in the memory map.
The PCI Bridge DMA processor sees the shared memory at a different address from
that used for normal accesses. For normal memory access the memory base address
register offset is 0x0000 0000. For DMA access address line A28 (On hardware
interface) must be high, therefore DMA memory access starts at 0x4000 0000 (Not
0x1000 0000 as addressing is in bytes).