6502/CLK
1
0
Fork 0
mirror of https://github.com/TomHarte/CLK.git synced 2024-12-27 01:31:42 +00:00
Code Issues Projects Releases Wiki Activity

The 5/3 split of microcycles appears not accurately to model when lines are tested.

Browse Source 
Therefore I've reverted to a more normative 4:4 form.
This commit is contained in:
Thomas Harte 2019-04-30 22:09:13 -04:00
parent 92568c90c8
commit 078c3135df
1 changed files with 0 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
Processors/68000/Implementation/68000Storage.cpp
View File

@ -208,13 +208,11 @@ struct ProcessorStorageConstructor {
// Fetch SSP.
if(token == "nF" || token == "nf") {
step.microcycle.length = HalfCycles(5);
step.microcycle.operation = Microcycle::NewAddress | Microcycle::Read | Microcycle::IsProgram; // IsProgram is a guess.
step.microcycle.address = &storage_.effective_address_[0].full;
step.microcycle.value = isupper(token[1]) ? &storage_.stack_pointers_[1].halves.high : &storage_.stack_pointers_[1].halves.low;
steps.push_back(step);
step.microcycle.length = HalfCycles(3);
step.microcycle.operation = Microcycle::SameAddress | Microcycle::Read | Microcycle::IsProgram | Microcycle::SelectWord;
step.action = Action::IncrementEffectiveAddress0;
steps.push_back(step);
@ -224,13 +222,11 @@ struct ProcessorStorageConstructor {
// Fetch exception vector.
if(token == "nV" || token == "nv") {
step.microcycle.length = HalfCycles(5);
step.microcycle.operation = Microcycle::NewAddress | Microcycle::Read | Microcycle::IsProgram; // IsProgram is a guess.
step.microcycle.address = &storage_.effective_address_[0].full;
step.microcycle.value = isupper(token[1]) ? &storage_.program_counter_.halves.high : &storage_.program_counter_.halves.low;
steps.push_back(step);
step.microcycle.length = HalfCycles(3);
step.microcycle.operation = Microcycle::SameAddress | Microcycle::Read | Microcycle::IsProgram | Microcycle::SelectWord;
step.action = Action::IncrementEffectiveAddress0;
steps.push_back(step);
@ -240,14 +236,12 @@ struct ProcessorStorageConstructor {
// Fetch from the program counter into the prefetch queue.
if(token == "np") {
step.microcycle.length = HalfCycles(5);
step.microcycle.operation = Microcycle::NewAddress | Microcycle::Read | Microcycle::IsProgram;
step.microcycle.address = &storage_.program_counter_.full;
step.microcycle.value = &storage_.prefetch_queue_.halves.low;
step.action = Action::AdvancePrefetch;
steps.push_back(step);
step.microcycle.length = HalfCycles(3);
step.microcycle.operation = Microcycle::SameAddress | Microcycle::Read | Microcycle::IsProgram | Microcycle::SelectWord;
step.action = Action::IncrementProgramCounter;
steps.push_back(step);
@ -272,13 +266,11 @@ struct ProcessorStorageConstructor {
assert(address_iterator != addresses.end());
step.microcycle.length = HalfCycles(5);
step.microcycle.operation = Microcycle::NewAddress | (is_read ? Microcycle::Read : 0);
step.microcycle.address = *address_iterator;
step.microcycle.value = isupper(token[1]) ? &scratch_data->halves.high : &scratch_data->halves.low;
steps.push_back(step);
step.microcycle.length = HalfCycles(3);
step.microcycle.operation = Microcycle::SameAddress | (is_read ? Microcycle::Read : 0) | (read_full_words ? Microcycle::SelectWord : Microcycle::SelectByte);
if(post_adjustment) {
// nr and nR should affect address 0; nw, nW, nrd and nRd should affect address 1.
@ -317,13 +309,11 @@ struct ProcessorStorageConstructor {
// A stack write.
if(token == "nS" || token == "ns") {
step.microcycle.length = HalfCycles(5);
step.microcycle.operation = Microcycle::NewAddress;
step.microcycle.address = &storage_.effective_address_[1].full;
step.microcycle.value = isupper(token[1]) ? &storage_.destination_bus_data_[0].halves.high : &storage_.destination_bus_data_[0].halves.low;
steps.push_back(step);
step.microcycle.length = HalfCycles(3);
step.microcycle.operation = Microcycle::SameAddress | Microcycle::SelectWord;
step.action = Action::DecrementEffectiveAddress1;
steps.push_back(step);
@ -335,13 +325,11 @@ struct ProcessorStorageConstructor {
if(token == "nU" || token == "nu") {
RegisterPair32 *const scratch_data = &storage_.source_bus_data_[0];
step.microcycle.length = HalfCycles(5);
step.microcycle.operation = Microcycle::NewAddress | Microcycle::Read;
step.microcycle.address = &storage_.effective_address_[0].full;
step.microcycle.value = isupper(token[1]) ? &scratch_data->halves.high : &scratch_data->halves.low;
steps.push_back(step);
step.microcycle.length = HalfCycles(3);
step.microcycle.operation = Microcycle::SameAddress | Microcycle::Read | Microcycle::SelectWord;
step.action = Action::IncrementEffectiveAddress0;
steps.push_back(step);