From e8e1b9f44dd9b2fec422f8fd5998112f17a54385 Mon Sep 17 00:00:00 2001 From: Luke Kenneth Casson Leighton Date: Fri, 13 Jul 2018 03:45:37 +0100 Subject: [PATCH] add slides --- shakti/m_class/libre_riscv_chennai_2018.tex | 46 ++++++++++----------- 1 file changed, 23 insertions(+), 23 deletions(-) diff --git a/shakti/m_class/libre_riscv_chennai_2018.tex b/shakti/m_class/libre_riscv_chennai_2018.tex index 2d12f8f3a..5cc4b4503 100644 --- a/shakti/m_class/libre_riscv_chennai_2018.tex +++ b/shakti/m_class/libre_riscv_chennai_2018.tex @@ -159,7 +159,7 @@ \begin{itemize} \item Customer entrapment (through proprietary software).\\ Strong business case for not entrapping customers:\\ - https://tinyurl.com/most-productive-meeting-ever + \url{https://tinyurl.com/most-productive-meeting-ever} \item Funding, endorsing, supporting or empowering unethical Companies, Organisations, Cartels and Individuals.\\ (cf: definition of an ethical act). @@ -211,11 +211,11 @@ \begin{itemize} \item DDR3/4: challenging! \$1m for single-use, single instance.\\ Symbiotic EDA: \$600k for PHY; CERN developed a Controller\\ - http://libre-riscv.org/shakti/m\_class/DDR/ + \url{http://libre-riscv.org/shakti/m_class/DDR/} \item HyperRAM (JEDEC xSPI): lower risk than DDR3/4\\ - http://libre-riscv.org/shakti/m\_class/HyperRAM/ + \url{http://libre-riscv.org/shakti/m_class/HyperRAM/} \item RGMII: several available (saves \$50k)\\ - http://libre-riscv.org/shakti/m\_class/RGMII/ + \url{http://libre-riscv.org/shakti/m_class/RGMII/} \item UART, SPI, I2C, PWM, SD/MMC: all libre (except eMMC). \item Shakti Group has FlexBus, QuadSPI, SRAM, many more. \item RGB/TTL: R. Herveille (SSD2828, SN75LVDS83b, TFP410a) @@ -237,12 +237,12 @@ {\it Silicon-proven but still risky. What are the alternatives?} \vspace{4pt} \begin{itemize} - \item 133mhz 32-bit SDRAM (um...) maybe even FlexBus? + \item FlexBus/SDRAM (low clock, lots of pins, single-data-rate). \item HyperRAM (aka JEDEC xSPI) 8-bit SPI 166mhz or DDR-300.\\ 300mbyte/sec for only 13 wires, not bad! (We'll take several)\\ - http://libre-riscv.org/shakti/m\_class/HyperRAM/ + \url{http://libre-riscv.org/shakti/m_class/HyperRAM/} \item HMC: insanely fast, very low power. OpenHMC (LGPL) - https://opencores.org/project/openhmc + \url{https://opencores.org/project/openhmc} \end{itemize} } @@ -256,9 +256,9 @@ \item H.264 seems to have been done...\\ https://github.com/adsc-hls/synthesizable\_h264 \item Really needs SIMD (or better, not-SIMD)\\ - {http://libre-riscv.org/simple\_v\_extension/} + \url{http://libre-riscv.org/simple_v_extension/} \item Definitely needs xBitManip (parallelised by Simple-V)\\ - https://github.com/cliffordwolf/xbitmanip + \url{https://github.com/cliffordwolf/xbitmanip} \end{itemize} {\it SIMD is insane. $O(N^6)$ opcode proliferation. See\\ https://www.sigarch.org/simd-instructions-considered-harmful/ \\ @@ -279,13 +279,13 @@ \item Each core needs independent variable-voltage capability and independent shut-down (PMIC supplies external voltage) \item DDR RAM still needs refreshing (even in sleep mode) - \item Extra RV32 (PicoRV32?) always-on core for wake-up / RTC? + \item Extra RV32 (PicoRV32?) always-on core for wake-up / RTC \item PLLs are Analog. fun fun fun in the sun sun sun... \end{itemize} {\it Really need help. PLLs, Analog stuff: specific - domain expertise. Fall-back example: - https://www.dolphin-integration.com? - } + domain expertise. Fall-back example:} + \url{https://www.dolphin-integration.com}? + } @@ -293,7 +293,7 @@ \begin{itemize} \item Actual requirements quite modest: 30MP/s 100MT/s 5GFLOPS - but power/area is crucial ($2mm^2$ @ 40nm) + but power/area is crucial ($2mm^2$ @ 40nm, 1W) \item Nyuzi, MIAOW, GPLGPU (Number Nine), OGP. \item Nyuzi based on Larrabee. Jeff Bush really helpful. \item MIAOW is an OpenCL engine. GPLGPU is fixed-function @@ -310,7 +310,7 @@ } -\frame{\frametitle{Challenging Stuff [5] - Custom Extensions} +\frame{\frametitle{Challenging Stuff [5] - Public Custom Extensions} \begin{itemize} \item GPUs are usually done with incompatible ISAs and effectively @@ -324,7 +324,7 @@ high-profile public hard-forks of gcc, binutils, llvm etc. Which isn't going to go down well. \item ISA "Conflict Resolution" is therefore absolutely critical\\ - http://libre-riscv.org/isa\_conflict\_resolution/ + \url{http://libre-riscv.org/isa_conflict_resolution/} \end{itemize} {\it Remember Altivec. Learn from Intel. \underline{This is everyone's problem.} @@ -338,16 +338,16 @@ \item Pinmux: multiplexer of functions onto pins\\ {\it DRAM Cell != DDR3/4, Mux Cell != Muxer} \item Strategically extremely important to Commercial SoC success\\ - STMicro, Rockchip, Freescale, Samsung, {\bf EVERYONE} + STMicro, Rockchip, Freescale, Samsung, TI, {\bf EVERYONE} \item Bizarrely, a libre-licensed multi-way Pinmux doesn't exist.\\ {\it not on anyone's radar. at all.} SiFive IOF not enough. \item Verification (scenario analysis) and auto-generation of TRM, header files, device-tree files, pretty much everything makes sense (to any "lazy" Software Engineer...) - \item Corporations with their own pinmux unlikely to be interested. - \item http://git.libre-riscv.org/?p=pinmux.git \\ - http://hands.com/~lkcl/pinmux\_chennai\_2018.pdf + \item Corporations with legacy pinmux unlikely to be interested. + \item \url{http://git.libre-riscv.org/?p=pinmux.git} \\ + \url{http://hands.com/~lkcl/pinmux\_chennai\_2018.pdf} \end{itemize} } @@ -358,11 +358,11 @@ \begin{itemize} \item Rudi (Asics.ws) donating time to create a Multi-Protocol Audio Controller: AC97, PCM, PDM, I2S\\ - http://libre-riscv.org/shakti/m\_class/AC97/ + \url{http://libre-riscv.org/shakti/m_class/AC97/} \item USB2 is... convoluted. UTMI-ULPI-USB2 PHY\\ USB2-PHY not confirmed (Rudi has one)\\ Also Rudi has DDR (8-pin) variant of ULPI - http://libre-riscv.org/shakti/m\_class/ULPI/ + \url{http://libre-riscv.org/shakti/m_class/ULPI/} \item USB3 not necessarily a good idea to put into Libre-RISCV\\ Daisho USB3 Pipe exists, TUSB1310a PHY is 175 pin FBGA! \item Libre SD/MMC typically at "Open" Level 20MB/sec appx. @@ -410,7 +410,7 @@ \begin{itemize} \item Contact: lkcl@lkcl.net - \item http://libre-riscv.org/shakti/m\_class/ + \item \url{http://libre-riscv.org/shakti/m_class/} \end{itemize} } -- 2.30.2