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[/] [a-z80] - Rev 22

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Rev	Log message	Author	Age	Path
22	Documentation update	gdevic	1390d 21h	/a-z80
21	Update zmac assembler to version 5jan2019	gdevic	1458d 23h	/a-z80
20	Revert "Corrected unconnected enable line" in memory_ifc module. Fixes erroneous extra delay of nIORQ signal on INT ACK.	gdevic	1971d 13h	/a-z80
19	Some documentation updates	gdevic	1982d 17h	/a-z80
18	Correctly latch IO RW wait request Fixed bug: Issuing nWAIT during IO RW was ignored (IORQ, not M1) Taping into a correct point of IORQ generator sequence train gives an additional signal to be OR-ed when composing a generic latch_wait Corrected unconnected enable line	gdevic	2260d 07h	/a-z80
17	z80: Release 5	gdevic	2668d 07h	/a-z80
16	Simplify by adding nhold_clk_wait Inverted version is used to feel AND gates to enable Keep hold_clk_wait used only in the sequencer	gdevic	2700d 22h	/a-z80
15	zxspectrum: Fix few Quartus warnings	gdevic	2701d 09h	/a-z80
14	Add hold_clk_wait to ALU CFL latch This correctly delays latching the C-Flag for CCF instruction when nWAIT was asserted at that instruction's M1/T2 cycle UART: fixed two synthesis warnings	gdevic	2701d 10h	/a-z80
13	Full support for nWAIT during M1 and memory cycles This set of changes fixes issues with nWAIT signal Updated reg control, resets, ir modules to handle delay This correctly delays clearing of IR if the nWAIT was asserted at the very first M1 cycle Simplify decode_state to use discrete write enable for CB/ED flags Gate CB/ED write with hold_clk_wait to enable nWAIT delay genfuse add code to test nWAIT insertion at M1 Add host wait state circuitry from Zilog manual (wait_state.*) Add wait test code to basic fpga/modelsim models Select from 3 options to test wait states: - no wait state inserted (nWAIT=1) - insert a wait state to every M1 cycle - insert a wait state to each memory access cycle zxspectrum: Add custom NMI handler and a function to enter game pokes after pressing the NMI button zxspectrum: Corrected bits 7,5 when reading ULA port 254 zxspectrum: Fix the shift key repeat bug When using additional keys (<,>,?,...) and shift was released before a symbol, it would repeat. This change fixes that by correctly resetting keyboard mask state bitfields. Added new data pins module for Lattice toolset It has been reported that "data_pins.v" does not compile on Lattice toolset and this variation of the code has been proposed and verified by a user. Fixed M1 during reset Memory_ifc module set M1 to inactive (high) during nRESET Exported wait_m1 signal from that module as a testpoint	gdevic	2702d 06h	/a-z80
12	Explicitly set python to execute within a batch file	gdevic	2714d 23h	/a-z80
11	zxspectrum improvements: - Added ZX Spectrum ROM mods as described in the blog: http://www.baltazarstudios.com/zx-spectrum-rom-mods This mod allows NMI interrupt to break into a special handler code inside the ROM image and let the user type a POKE address (5 decimal digits) + value (3 decimal digits) to modify a memory location - Changed default joystick pins to Atari style joystick as described in the blog - Added a timing constraints file	gdevic	2927d 08h	/a-z80
10	zxspectrum: Various improvements - Fixed keyboard bug (by Bogdan S.) - Minor comment changes - Renamed reset to nreset	gdevic	2972d 23h	/a-z80
9	Updated documentation	gdevic	2973d 16h	/a-z80
8	z80: Release 4	gdevic	2973d 19h	/a-z80
7	z80: Fixing repeating INIR/OTIR class of instructions	gdevic	3037d 23h	/a-z80
6	Added deployment folder with all files needed to use the CPU Changed ZX Spectrum project to use deployment files as example Changed extension for Verilog include files from .i to .vh Updated documentation; added section on file generators Minor corrections and fixes to various files	gdevic	3388d 09h	/a-z80
5	zxspectrum: Various improvements - Added "Turbo" speed mode switch (SW2) - Turbo speed is (3.5 MHz x 2 = 7.0 MHz) - LEDG5 lits when a key is being pressed - LEDG6 blinks when a speaker/line-in is being toggled Misc: - Fixed a false clock for ula:beep - Fixed unused Kempston input warning - Updated documentation to 1.1	gdevic	3417d 22h	/a-z80
4	- Removed files that are left in the root folder	gdevic	3423d 23h	/a-z80
3	- New directory structure - Added documentation files (and PDF versions) - Fixed tests	gdevic	3423d 23h	/a-z80

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[/] [a-z80] - Rev 22

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