Cobham Gaisler AB
GRSPW2
The SpaceWire core provides an interface between the AHB bus and a SpaceWire network. It implements the SpaceWire standard (ECSS-E-ST-50-12C) with the protocol identification extension (ECSS-E-ST-50-51C). The optional Remote Memory Access Protocol (RMAP) target implements the ECSS standard (ECSS-E-ST-50-52C).
The SpaceWire interface is configured through a set of registers accessed through an APB interface. Data is transferred through DMA channels using an AHB master interface. The number of DMA channels is configurable from one to four.
The core optionally be configured with two SpaceWire ports with manual or automatic switching between them.
The estimated resource utilization of the GRSPW2 is:
The next figure shows the GRSPW2 interfaces.
The following is a summary of the features:
- Full implementation of SpaceWire standard (ECSS-E-ST-50-12C)
- Protocol identification extension (ECSS-E-ST-50-51C)
- RMAP protocol (ECSS-E-ST-50-52C)
- AMBA AHB back-end with DMA
- Descriptor-based autonomous multi-packet transfer
- SEU protection of internal buffers
- Configurable data recovery mechanism
- Configurable number of clock regions
- Optional redundant ports