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Cleanup

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This commit is contained in:
Eddie Hung 2019-10-07 15:58:55 -07:00
parent b2e34f932a
commit 4f0818275f
1 changed files with 2 additions and 7 deletions
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9
techlibs/xilinx/abc9_map.v
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@ -25,11 +25,6 @@
// For example, (complex) flip-flops are expected to be described as an // For example, (complex) flip-flops are expected to be described as an
// combinatorial box (containing all control logic such as clock enable // combinatorial box (containing all control logic such as clock enable
// or synchronous resets) followed by a basic D-Q flop. // or synchronous resets) followed by a basic D-Q flop.
// ============================================================================
// `abc9' requires that complex flops be split into a combinatorial box
// feeding a simple flop ($_ABC9_FF_).
// Yosys will automatically analyse the simulation model (described in // Yosys will automatically analyse the simulation model (described in
// cells_sim.v) and detach any $_DFF_P_ or $_DFF_N_ cells present in // cells_sim.v) and detach any $_DFF_P_ or $_DFF_N_ cells present in
// order to extract the combinatorial control logic left behind. // order to extract the combinatorial control logic left behind.
@ -55,8 +50,8 @@
// || || // || ||
// || /\/\/\/\ || // || /\/\/\/\ ||
// D -->>-----< > || +------+ // D -->>-----< > || +------+
// R -->>-----< Comb. > || |$_ABC_| // R -->>-----< Comb. > || |$__ABC|
// CE -->>-----< logic >--->>-- $nextQ --| FF_ |--+-->> Q // CE -->>-----< logic >--->>-- $nextQ --| _FF_ |--+-->> Q
// $abc9_currQ +-->>-----< > || +------+ | // $abc9_currQ +-->>-----< > || +------+ |
// | || \/\/\/\/ || | // | || \/\/\/\/ || |
// | || || | // | || || |