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[/] [spi_master_slave/] [trunk/] [syn/] [spi_master_atlys_top_bit.zip] - Rev 22

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22 spi_slave.vhd: v2.02.0126 [JD]
ISSUE: the miso_o MUX that preloads tx_bit when SSEL='1' will glitch for CPHA='1'.
FIX: added a registered drive for the MUX select that will transfer the tx_reg only after the first tx_reg update.		 jdoin 4616d 05h /spi_master_slave/trunk/syn/spi_master_atlys_top_bit.zip
20 - removed folder trunk/bench.
- added ISE13.1 complete project, with synthesis, map, place & route and timing reports. This project generates bitgen file to program a Digilent Atlys board to verify the cores in FPGA hardware, and include a simulation testbench to simulate the cores.		 jdoin 4634d 07h /spi_master_slave/trunk/syn/spi_master_atlys_top_bit.zip
13 spi_slave.vhd: v2.02.0120
spi_master.vhd: v1.15.0135

Several bugs fixed. Master and Slave cores tested at all spi modes, at 50MHz SCK, including continuous transfers.		 jdoin 4643d 04h /spi_master_slave/trunk/syn/spi_master_atlys_top_bit.zip
12 SPI_SLAVE: v2.00.0110 [JD] FIX: CPHA bugs:
-- - redesigned core clocking to address all CPOL and CPHA configurations.
-- - added CHANGE_EDGE to the FSM register transfer logic, to have MISO change at opposite
-- clock phases from SHIFT_EDGE.
-- Removed global signal setting at the FSM, implementing exhaustive explicit signal attributions
-- for each state, to avoid reported inference problems in some synthesis engines.
-- Streamlined port names and indentation blocks.		 jdoin 4647d 04h /spi_master_slave/trunk/syn/spi_master_atlys_top_bit.zip
11 v1.12.0105: Modified SCK output circuit in spi_master.vhd.
In CPHA='0', top speed is +50MHz, in CPHA='1', top speed is 25MHz.		 jdoin 4658d 03h /spi_master_slave/trunk/syn/spi_master_atlys_top_bit.zip
10 v1.11.0080: Changed sampling of MISO in spi_master.vhd (removed the input register).
Verified master+slave cores in silicon on a Spartan-6 FPGA at 100MHz, using Xilinx ISE 13.1 and a Digilent Atlys board. Project is included in trunk/syn/spi_master_atlys.xise.		 jdoin 4659d 04h /spi_master_slave/trunk/syn/spi_master_atlys_top_bit.zip
5 Changed clocking to use a single high-speed clock for the whole core, using clock enables to control slower timing.
Added SPI line clock divider from high-speed system clock.
Added pipeline delay logic to sync phase of SCK and MOSI, enabling very high operating frequencies.
Verified in silicon for SCK and MOSI at 50MHz, with very robust operation.		 jdoin 4665d 03h /spi_master_slave/trunk/syn/spi_master_atlys_top_bit.zip

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