framebuffer.cdl File Reference

Framebuffer module with separate display and video sides. More...

Detailed Description

Framebuffer module with separate display and video sides.

Copyright

(C) 2016-2017, Gavin J Stark. All rights reserved.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0. Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

CDL implementation of a module that takes SRAM writes into a framebuffer, and includes a mapping to a dual-port SRAM (write on one side, read on the other), where the video side drives out vsync, hsync, data enable and pixel data.

The current implementation is 1bpp RGB, with 16 pixels per SRAM word Bottom 16 SRAM data bits [16; 0] are red, bit[15] leftmost Next 16 SRAM data bits [16; 16] are green, bit[31] leftmost Top 16 SRAM data bits [16; 132] are blue, bit[47] leftmost

Data Structures
struct	framebuffer::t_pixel_combs
struct	framebuffer::t_pixel_shift_register
struct	framebuffer::t_pixel_state
struct	framebuffer::t_sram_state
struct	framebuffer::t_csrs

Namespaces
	framebuffer

Enumerations
enum	framebuffer::t_csr_address {   framebuffer::csr_address_base_address = 0,   framebuffer::csr_address_words_per_line = 1 }