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-{{{
-#!htmlcomment
-
-This page is maintained automatically by a script. Don't modify this page by hand,
-your changes will just be overwritten the next time the script runs. Talk to your
-Friendly Neighborhood Repository Maintainer if you need to change something here.
-
-}}}
-
-{{{
-#!html
-<h1>Master Key Memory Interface</h1>
-
-<p>This core provides a 32-bit interface to a master key memory (MKM)
-implemented using an external volatile memory. The memory targeted is
-<a href="https://www.microchip.com/wwwproducts/en/23K640">Microchip 23K640</a>, a
-serial SRAM with a SPI interface.</p>
-
-<h2>Purpose and Functionality</h2>
-
-<p>The Master Key Memory is where a cryptographic master key is stored. the
-key is used (for example) to cryptographically wrap other keys and
-secrets. By wiping the MKM and thus the master key, the wrapped secrets
-are protected against leakage to a local attacker that physically breaks
-an active tamper detect shield.</p>
-
-<p>The core will in future versions provide functionality to autonomously
-protect against memory remanence effects by rotating bits in stored data
-and moving data to different addresses in the external memory. The core
-will also be able to autonomously zeroise the memory when given an alarm
-signal.</p>
-
-<p>The current version however simply provides an interface to the slower,
-serial memory including initializing the memory in the correct mode. The
-core supports three commands: read word, write word and initialize
-memory.</p>
-
-<h2>Limitations</h2>
-
-<p>The SPI clock is generated by the core clock (clk) divided by the
-SPI clock divisor * 2 (the divisor is the half period in cycles). The
-default divisor is set to generate an SPI clock of less than 1 MHz when
-the core clock is 50 MHz. For other speeds and other
-core frequencies the divisor will have to be adjusted.</p>
-
-<p>The core will only read and write complete 32-bit words.</p>
-
-<p>Commands given while the core is performing a read, write or
-initialization operation will silently be ignored.</p>
-
-<h2>Implementation</h2>
-
-<p>The implementation is divided into three parts:</p>
-
-<ul>
-<li><p>A SPI interface able to transmit a given number of bits at a given SPI
-clock rate. Data received are simultaneously collected and provided as
-read data. The SPI interface also generates the SPI clock and chip
-enable.</p></li>
-<li><p>A command handler core that read and write words as well as send
-init commands to the memory using the SPI interface.</p></li>
-<li><p>An API interface that provides the ability to configure the SPI clock
-speed, setting the address to be read or written and data access.</p></li>
-</ul>
-
-<p>The current implementation will initiate the Microchip memory directly
-after reset and set the memory in sequential mode. This means that it
-would actually be possible to write a stream of data to the memory, but
-since the API only handles a single 32-bit word, the mode is only used
-to remove the need to update the address between bytes.</p>
-
-<h3>Implementation Results</h3>
-
-<p><strong>Altera Cyclone IV E</strong></p>
-
-<ul>
-<li>Registers: 212</li>
-<li>Logic Elements: 289</li>
-<li>Fmax: 250 MHz</li>
-</ul>
-
-<p><strong>Altera Cyclone V</strong></p>
-
-<ul>
-<li>Registers: 221</li>
-<li>ALMs: 113</li>
-<li>Fmax: 194 MHz</li>
-</ul>
-
-<p><strong>Xilinx Spartan 6</strong></p>
-
-<ul>
-<li>Slice Registers: 206</li>
-<li>Slice LUTs: 185</li>
-<li>Fmax: 200 MHz</li>
-</ul>
-
-<p><strong>Xilinx Artix 7</strong></p>
-
-<ul>
-<li>Slice Registers: 205</li>
-<li>Slice LUTs: 176</li>
-<li>Fmax: 383 MHz</li>
-</ul>
-
-<h2>Status</h2>
-
-<p><strong>(2016-05-10)</strong></p>
-
-<p>The core has now been verified in a Xilinx Spartan-6 FPGA and the target
-Microchip memory connected to the FPGA.memory. Read and write access has
-successfully been performed with SPI clock speeds from 300 Hz to 10 MHz.</p>
-
-<p><strong>(2016-05-02)</strong></p>
-
-<p>Functional development completed. Simulation based debugging
-completed. Built design for both Altera and Xilinx FPGAs.</p>
-
-<p><strong>(2016-04-25)</strong></p>
-
-<p>Refactored core into top_-, core- and spi-modules. Made the design much
-simpler. First implementation almost completed.</p>
-
-<p><strong>(2016-04-21)</strong></p>
-
-<p>Core implementation started.</p>
-}}}
-
-[[RepositoryIndex(format=table,glob=user/js/mkmif)]]
-
-|| Clone `https://git.cryptech.is/user/js/mkmif.git` ||