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25 jdoin 2948d 17h /
24 - fixed range of the switch debouncer for the verification circuit
- reorganized rtl folder in mainstream trunk
jdoin 2948d 17h /
23 Clarified copyright and licensing
Added trunk/license directory
Added LGPL 3.0 license text "lgpl.txt"
Fixed inline url for the GNU link of the LGPL license
Updated readme files and rtl files
jdoin 2968d 21h /
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 2970d 08h /
21 - Updated ISE13 verification project. jdoin 2987d 11h /
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 2988d 10h /
19 v2.02.0123: ISSUE: continuous transfer mode bug, for ignored 'di_req' cycles. Instead of repeating the last data word, the slave will send (others => '0') instead. jdoin 2990d 09h /
18 v2.02.0122: Fixed bug SLAVE Continuous Transfer.
The fix consists in engaging continuous transfer regardless of the user strobing write enable, and sequencing from state 1 to N as long as the master clock is present.
If the user does not write new data, the last data word is repeated.
jdoin 2990d 16h /
17 Master: v1.15.0136 [JD] Fixed assertions (PREFETCH >= 1) and minor comment bugs.
Slave: v2.02.0121 [JD] Changed minor comment bugs in the combinatorial fsm logic.
jdoin 2994d 07h /
16 Master: v1.15.0136 [JD] Fixed assertions (PREFETCH >= 1) and minor comment bugs.
Slave: v2.02.0121 [JD] Changed minor comment bugs in the combinatorial fsm logic.
jdoin 2994d 08h /
15 Updated manual text. jdoin 2995d 12h /
14 Updated specifications manual, deleted old documentation stuff, changed minor text errors in the code. jdoin 2996d 11h /
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 2997d 07h /
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 3001d 07h /
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 3012d 06h /
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 3013d 07h /
9 Updated verification data. jdoin 3016d 20h /
8 Updated Documentation jdoin 3016d 20h /
7 Updated code comments in VHDL files, added readme.txt files, updated work-in-progress version of the .doc core specification manual. jdoin 3017d 09h /
6 v1.10.0075: 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 3019d 06h /

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