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-rw-r--r--assets/ppu-level-1.svg2
-rw-r--r--assets/ppu-level-2.svg3
-rw-r--r--docs/ppu.drawio2
-rw-r--r--docs/research.md78
4 files changed, 81 insertions, 4 deletions
diff --git a/assets/ppu-level-1.svg b/assets/ppu-level-1.svg
index f8592a2..cba8ddb 100644
--- a/assets/ppu-level-1.svg
+++ b/assets/ppu-level-1.svg
@@ -1,3 +1,3 @@
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
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diff --git a/assets/ppu-level-2.svg b/assets/ppu-level-2.svg
new file mode 100644
index 0000000..ad80c42
--- /dev/null
+++ b/assets/ppu-level-2.svg
@@ -0,0 +1,3 @@
+<?xml version="1.0" encoding="UTF-8"?>
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text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 78px; height: 1px; padding-top: 47px; margin-left: 141px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">Foreground sprite info</div></div></div></foreignObject><text x="180" y="51" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">Foreground sp...</text></switch></g><path d="M 270 267 L 270 300.63" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="stroke"/><path d="M 270 305.88 L 266.5 298.88 L 270 300.63 L 273.5 298.88 Z" fill="rgb(0, 0, 0)" stroke="rgb(0, 0, 0)" stroke-miterlimit="10" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; 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text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 447px; margin-left: 290px;"><div data-drawio-colors="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; background-color: rgb(255, 255, 255); white-space: nowrap;">VGA signal</div></div></div></foreignObject><text x="290" y="450" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="11px" text-anchor="middle">VGA signal</text></switch></g><rect x="230" y="387" width="80" height="40" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; 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text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 197px; margin-left: 240px;"><div data-drawio-colors="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; background-color: rgb(255, 255, 255); white-space: nowrap;">pixel data</div></div></div></foreignObject><text x="240" y="200" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="11px" text-anchor="middle">pixel data</text></switch></g><path d="M 120.5 42 L 120.5 31.5 L 139.5 47 L 120.5 62.5 L 120.5 52 L 80.03 52 L 79.5 52 L 79.5 62.5 L 60.5 47 L 79.5 31.5 L 79.5 42 L 80.03 42 Z" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="1.42" pointer-events="all"/><path d="M 120.5 42 L 120.5 31.5 L 139.5 47 L 120.5 62.5 L 120.5 52" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="4" pointer-events="all"/><path d="M 79.5 52 L 79.5 62.5 L 60.5 47 L 79.5 31.5 L 79.5 42" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="4" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 47px; margin-left: 100px;"><div data-drawio-colors="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; background-color: rgb(255, 255, 255); white-space: nowrap;">FAM</div></div></div></foreignObject><text x="100" y="50" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="11px" text-anchor="middle">FAM</text></switch></g><rect x="140" y="147" width="80" height="40" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 78px; height: 1px; padding-top: 167px; margin-left: 141px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">Sprite render</div></div></div></foreignObject><text x="180" y="171" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">Sprite render</text></switch></g><path d="M 480.5 162 L 480.5 151.5 L 499.5 167 L 480.5 182.5 L 480.5 172 L 480.03 172 L 420.5 172 L 420.5 162 L 480.03 162 Z" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="1.42" pointer-events="all"/><path d="M 480.5 162 L 480.5 151.5 L 499.5 167 L 480.5 182.5 L 480.5 172" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="4" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 167px; margin-left: 460px;"><div data-drawio-colors="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; background-color: rgb(255, 255, 255); white-space: nowrap;">TMM</div></div></div></foreignObject><text x="460" y="170" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="11px" text-anchor="middle">TMM</text></switch></g><rect x="500" y="147" width="120" height="40" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 167px; margin-left: 501px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">Tilemap memory</div></div></div></foreignObject><text x="560" y="171" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">Tilemap memory</text></switch></g><path d="M 420.5 52 L 420.5 42 L 450.03 42 L 480.5 42 L 480.5 31.5 L 499.5 47 L 480.5 62.5 L 480.5 52 L 450.03 52 Z" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="1.42" pointer-events="all"/><path d="M 480.5 42 L 480.5 31.5 L 499.5 47 L 480.5 62.5 L 480.5 52" fill="none" stroke="rgb(0, 0, 0)" stroke-miterlimit="4" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 1px; height: 1px; padding-top: 47px; margin-left: 460px;"><div data-drawio-colors="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 11px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; background-color: rgb(255, 255, 255); white-space: nowrap;">BAM</div></div></div></foreignObject><text x="460" y="50" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="11px" text-anchor="middle">BAM</text></switch></g><rect x="500" y="27" width="120" height="40" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 118px; height: 1px; padding-top: 47px; margin-left: 501px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">Background attribute memory</div></div></div></foreignObject><text x="560" y="51" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">Background attribute...</text></switch></g><rect x="150" y="437" width="100" height="20" fill="none" stroke="none" pointer-events="all"/><g transform="translate(-0.5 -0.5)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe center; justify-content: unsafe center; width: 98px; height: 1px; padding-top: 447px; margin-left: 151px;"><div data-drawio-colors="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); " style="box-sizing: border-box; font-size: 0px; text-align: center;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; background-color: rgb(255, 255, 255); white-space: normal; overflow-wrap: normal;">screen position</div></div></div></foreignObject><text x="200" y="451" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="middle">screen position</text></switch></g><rect x="390" y="27" width="30" height="320" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" transform="rotate(180,405,187)" pointer-events="all"/><g transform="translate(-0.5 -0.5)rotate(-90 397 37)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-start; justify-content: unsafe flex-end; width: 310px; height: 1px; padding-top: 37px; margin-left: 87px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: right;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">PPU RAM bus</div></div></div></foreignObject><text x="397" y="49" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="end">PPU RAM bus</text></switch></g><rect x="30" y="27" width="30" height="160" fill="rgb(255, 255, 255)" stroke="rgb(0, 0, 0)" transform="rotate(180,45,107)" pointer-events="all"/><g transform="translate(-0.5 -0.5)rotate(-90 37.000000000000114 37)"><switch><foreignObject pointer-events="none" width="100%" height="100%" requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility" style="overflow: visible; text-align: left;"><div xmlns="http://www.w3.org/1999/xhtml" style="display: flex; align-items: unsafe flex-start; justify-content: unsafe flex-end; width: 150px; height: 1px; padding-top: 37px; margin-left: -113px;"><div data-drawio-colors="color: rgb(0, 0, 0); " style="box-sizing: border-box; font-size: 0px; text-align: right;"><div style="display: inline-block; font-size: 12px; font-family: Helvetica; color: rgb(0, 0, 0); line-height: 1.2; pointer-events: all; white-space: normal; overflow-wrap: normal;">PPU RAM bus</div></div></div></foreignObject><text x="37" y="49" fill="rgb(0, 0, 0)" font-family="Helvetica" font-size="12px" text-anchor="end">PPU RAM bus</text></switch></g></g><switch><g requiredFeatures="http://www.w3.org/TR/SVG11/feature#Extensibility"/><a transform="translate(0,-5)" xlink:href="https://www.diagrams.net/doc/faq/svg-export-text-problems" target="_blank"><text text-anchor="middle" font-size="10px" x="50%" y="100%">Text is not SVG - cannot display</text></a></switch></svg> \ No newline at end of file
diff --git a/docs/ppu.drawio b/docs/ppu.drawio
index 17ea515..2efedf8 100644
--- a/docs/ppu.drawio
+++ b/docs/ppu.drawio
@@ -1 +1 @@
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name="level-2">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</diagram><diagram id="lj51MlK96fuJFRP7cw84" name="level-3">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</diagram></mxfile> \ No newline at end of file
diff --git a/docs/research.md b/docs/research.md
index 6e16bc8..acb1c24 100644
--- a/docs/research.md
+++ b/docs/research.md
@@ -172,12 +172,86 @@ Notable differences:
![PPU top-level design](../assets/ppu-level-1.svg)
-![PPU level 2 design](../assets/ppu-level-2.svg)
+Important notes:
+
+- The STM32 receives 'feedback' lines from the PPU. These are mirrors of the
+ VSYNC and HSYNC lines from the VGA signal generator. These lines can be used
+ to trigger interrupts for counting frames, and to make sure no read/write
+ conflicts occur for protected memory regions in the PPU.
+- The STM32 can enable and reset the PPU. These lines will also be connected to
+ physical buttons on the FPGA.
+- The STM32 uses direct memory access to control the PPU.
+
+![PPU level 2 design (data flows from top to bottom)](../assets/ppu-level-2.svg)
+
+Important notes:
+
+- The pixel fetch logic is pipelined in 3 stages:
+ 1. - (Foreground sprite info) calculate if foreground sprite exists at current pixel using FAM register
+ - (Background sprite info) get background sprite info from BAM register
+ 2. - (Sprite render) calculate pixel to read from TMM based on sprite info
+ 3. - (Compositor) get pixel with 'highest' priority (pick first foreground
+ sprite with non-transparent color at current pixel in order, fallback to
+ background)
+ - (Palette lookup) lookup palette color using palette register
+ - (VGA signal generator) output real color to VGA signal generator
+- The pipeline takes 5 clock ticks in total. About 18 are available during each
+ pixel. For optimal display compatibility, the output color signal should be
+ stable before 50% of the pixel clock pulse width (9 clock ticks).
+- RAM regions mentioned that don't have a block right of the PPU RAM bus in
+ this graphic, are stored in and exposed by the component that mentions the
+ memory region.
+- Each foreground sprite render component holds its own sprite data copy from
+ the RAM in it's own cache memory. The cache updates are fetched during the
+ VBLANK time between each frame.
+- Since the "sprite info" and "sprite render" steps are fundamentally different
+ for the foreground and background layer, these components will be combined
+ into one for each layer respectively. They are separated in the above diagram
+ for pipeline stage illustration.
+- The pipeline stages with two clock cycles contain an address set and memory
+ read step.
+- The palette lookup component has separate memory that is connected to the PPU
+ RAM bus for read/write access.
+
+### Registers
+
+|Address range |Alias|Description|
+|-----------------|-----|-----------|
+|`0x0000`-`0x0000`|TMM |[tilemap memory][TMM]|
+|`0x0000`-`0x0000`|BAM |[background attribute memory][BAM]|
+|`0x0000`-`0x0000`|FAM |[foreground attribute memory][FAM]|
+|`0x0000`-`0x0000`|PAL |[palettes][PAL]|
+|`0x0000`-`0x0000`|BAX |[background auxiliary memory][BAX]|
+
+[TMM]: #tilemap-memory
+#### Tilemap memory
+
+- TODO: list format
+
+[BAM]: #background-attribute-memory
+#### Background attribute memory
+
+- TODO: list format
+
+[FAM]: #foreground-attribute-memory
+#### Foreground attribute memory
+
+- TODO: list format
+
+[PAL]: #palettes
+#### Palettes
+
+- TODO: list format
+
+[BAX]: #background-auxiliary-memory
+#### Background auxiliary memory
+
+- background scrolling
[nesppuspecs]: https://www.copetti.org/writings/consoles/nes/
[nesppudocs]: https://www.nesdev.org/wiki/PPU_programmer_reference
[nesppupinout]: https://www.nesdev.org/wiki/PPU_pinout
-[custompputimings]: https://docs.google.com/spreadsheets/d/1MU6K4c4PtMR_JXIpc3I0ZJdLZNnoFO7G2P3olCz6LSc/edit?usp=sharing
+[custompputimings]: https://docs.google.com/spreadsheets/d/1MU6K4c4PtMR_JXIpc3I0ZJdLZNnoFO7G2P3olCz6LSc
# Generating audio signals