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author | 2017-12-10 15:32:24 -0500 | |
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committer | 2017-12-10 15:32:24 -0500 | |
commit | e733af5b0807dbf88ad32645f4c39210de99946c (patch) | |
tree | c180b292e77ba120c08a16210a517782b4faf3eb /docs/source/techspecs | |
parent | 0306e6e11996495b5c0d5195dbbbac596bf9a78f (diff) |
Documentation update (nw)
Diffstat (limited to 'docs/source/techspecs')
-rw-r--r-- | docs/source/techspecs/device_rom_interface.rst | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/docs/source/techspecs/device_rom_interface.rst b/docs/source/techspecs/device_rom_interface.rst index ab5eb18737b..8baf7fbb576 100644 --- a/docs/source/techspecs/device_rom_interface.rst +++ b/docs/source/techspecs/device_rom_interface.rst @@ -41,7 +41,16 @@ rom description for the system, it will be automatically picked up as the connected rom. An address map has priority over the region if present in the machine config. -| void **set_rom**\ (const void \*base, UINT32 size); +| void **set_rom_endianness**\ (endianness_t endian) +| void **set_rom_data_width**\ (u8 width) +| void **set_rom_addr_width**\ (u8 width) + +These methods, intended for generic devices with indefinite hardware +specifications, override the endianness, data bus width and address +bus width assigned through the constructor. They must be called from +within the device before **config_complete** time. + +| void **set_rom**\ (const void \*base, u32 size); At any time post- **interface_pre_start**, a memory block can be setup as the connected rom with that method. It overrides any @@ -76,3 +85,8 @@ Using that interface makes the device derive from **device_memory_interface**. If the device wants to actually use the memory interface for itself, remember that AS_0/AS_PROGRAM is used by the rom interface, and don't forget to upcall **memory_space_config**. + +For devices which have outputs that can be used to address ROMs but +only to forward the data to another device for processing, it may be +helpful to disable the interface when it is not required. This can be +done by overriding **memory_space_config** to return an empty vector. |