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408 commits 8 branches 8 tags 17 MiB
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226 commits

Author SHA1 Message Date
Olof Kindgren
f70b79fd8f Combine lt and eq regs to cmp_r in serv_alu 2021-02-01 22:37:45 +01:00
Olof Kindgren
6fbdea58d6 Optimize trap handling 2021-01-23 22:42:26 +01:00
Olof Kindgren
8d5dd77a26 Optimize csr address handling 2021-01-23 22:42:26 +01:00
Olof Kindgren
e4b773c17b Syntax fixes 2021-01-18 22:47:28 +01:00
Olof Kindgren
5e4181d204 Optimize shift operations 2021-01-18 22:46:51 +01:00
Olof Kindgren
d5febe8f63 Simplify and document trap handling 2021-01-18 22:38:07 +01:00
Olof Kindgren
17103dd1f5 Merge LSB registers into bufreg 2021-01-11 21:40:45 +01:00
Olof Kindgren
fe6c9b0f83 Optimize bufreg lsb signal and clean up bufreg interface 2021-01-06 22:19:40 +01:00
Olof Kindgren
0bc19ef13c Clean up serv_alu interface 2021-01-06 22:02:13 +01:00
Olof Kindgren
ace7b8ef44 Explain and optimize state counter 2021-01-03 00:01:09 +01:00
Olof Kindgren
25fa6fa83b Clean up and document serv_mem_if 2021-01-02 00:02:23 +01:00
Olof Kindgren
ca1a07f684 Document and clean up interface of serv_immdec 2020-12-29 23:35:17 +01:00
Olof Kindgren
a960fd768b Remove redundant bufreg_loop control signal 2020-12-22 22:13:57 +01:00
Olof Kindgren
c9f41b54e8 Optimize init signal 2020-12-22 22:13:57 +01:00
Olof Kindgren
d6445b95a6 Clean up serv_ctrl 2020-12-06 22:39:04 +01:00
Olof Kindgren
116e370589 Reverse polarity of bufreg_hold signal 2020-12-06 22:39:04 +01:00
Olof Kindgren
aa16bc40b6 Move ibus_cyc handling to serv_state 2020-12-02 16:19:34 +01:00
Olof Kindgren
fd79a2ea0c Use cnt0 in serv_ctrl 2020-12-01 22:40:52 +01:00
Olof Kindgren
bbe3e56ab2 Decouple ibus_cyc and ibus_ack 2020-11-30 23:13:11 +01:00
Olof Kindgren
90ce4ff1af Syntax and reset fixes for ModelSim 2020-11-10 15:16:19 +01:00
Olof Kindgren
c1b8471678 Add reset_strategy parameter 
The reset_strategy parameter controls how much reset to apply to
SERV. It can be set to MINI for the default behaviour, or NONE to
only apply reset where absolutely needed and rely on POR to clear
FFs
 2020-11-10 15:16:19 +01:00
Olof Kindgren
44287ed244 Remove unused reset input from serv_alu 2020-11-10 15:16:19 +01:00
Olof Kindgren
6aeb39c7ac Clean up port maps in serv_top 2020-11-10 15:16:19 +01:00
Olof Kindgren
3751b58253 Clean up serv_csr interface 2020-11-10 15:16:19 +01:00
Olof Kindgren
554bdccba0 Silence some warnings 2020-11-10 15:16:19 +01:00
Olof Kindgren
cc42437e0f Prepare for alternative immediate decoder 2020-11-10 15:16:19 +01:00
Olof Kindgren
3f81f07db3 Clarify immdec_ctrl[1] 2020-11-10 15:16:19 +01:00
Olof Kindgren
8faf0cf33b Simplify and explain csr_imm_en 2020-11-10 15:16:19 +01:00
Olof Kindgren
ee6a86705d Set size of WITH_CSR to avoid Quartus warning 2020-09-29 17:52:02 +02:00
Olof Kindgren
f10cb89ae4 Fix double-defined result_lt wire 2020-09-29 14:12:57 +02:00
Olof Kindgren
25e86fdd3c Small optimization of instruction fetching logic 2020-08-26 16:45:40 +02:00
Olof Kindgren
3aa1a2c6e5 Simplify and document mstatus/mcause assignments 2020-08-26 16:45:40 +02:00
Olof Kindgren
fa6c420b10 Remove redundant mstatus register 2020-08-26 16:45:40 +02:00
Olof Kindgren
915cdf7933 Move RF address decoding to serv_immdec 2020-08-17 13:00:29 +02:00
Olof Kindgren
88a1a43438 Refactor and Use ALU subtractor for comparisons 2020-08-13 23:37:11 +02:00
Olof Kindgren
1c4e793885 Move CSR immediate decoder to immdec 2020-08-13 23:37:11 +02:00
Olof Kindgren
8775b321d9 Move jump decision logic to serv_state 2020-08-13 23:37:11 +02:00
Olof Kindgren
a614e427b8 Move immediate decoder to separate module 2020-08-13 23:37:11 +02:00
Olof Kindgren
119473d506 Move CSR_SOURCE_ constants into serv_csr.v 2020-08-13 23:37:11 +02:00
Olof Kindgren
707f63ae8c Rename ser_shift to serv_shift for consistency 2020-05-26 22:48:40 +02:00
Olof Kindgren
188fd2ecc8 Restore nettype to wire in toplevels 
This is needed to prevent breaking sources following SERV that
don't handle nettype properly
 2020-05-26 22:46:01 +02:00
Olof Kindgren
9606e3503d Inline shift_reg 2020-05-26 22:43:23 +02:00
Gwenhael Goavec-Merou
2a76adc8db Add compatibility with Xilinx ISE 2020-05-06 20:19:52 +02:00
Olof Kindgren
fda7dd288a Optimize enable signal for mem_if buffers 2020-04-15 22:48:28 +02:00
Olof Kindgren
1d311edb7d Make counter internal in serv_state 2020-04-15 10:29:50 +02:00
Olof Kindgren
09c7d6dbbf Remove FSM from serv_state 2020-04-05 00:22:44 +02:00
Olof Kindgren
8dd75fa752 Stop using states in logic expressions 2020-04-04 23:44:29 +02:00
Olof Kindgren
9a8dcde030 Simplify o_dbus_adr assignment 2020-04-03 22:58:24 +02:00
Olof Kindgren
6b0e4fb3ea Disable misalignment traps when CSR is disabled 2020-03-27 08:55:34 +01:00
Olof Kindgren
726e520cce Fix lint warnings when CSR is disabled 2020-03-25 23:32:12 +01:00