diff --git a/arch/csr/misa.yaml b/arch/csr/misa.yaml
index d82e3975a0..c7bf07fb7f 100644
--- a/arch/csr/misa.yaml
+++ b/arch/csr/misa.yaml
@@ -23,8 +23,8 @@ misa:
         Writing 0 to this field will cause all atomic instructions to raise an `IllegalInstruction` exception.
       type(): |
         return (implemented?(ExtensionName::A) && MUTABLE_MISA_A) ? CsrFieldType::RW : CsrFieldType::RO;
-      reset_value(): |
-        return implemented?(ExtensionName::A) ? 1 : 0;
+      definedBy: A
+      reset_value: 1
     B:
       location: 1
       description: |
@@ -34,8 +34,8 @@ misa:
         Writing 0 to this field will cause all bitmanip instructions to raise an `IllegalInstruction` exception.
       type(): |
         return (implemented?(ExtensionName::B) && MUTABLE_MISA_B) ? CsrFieldType::RW : CsrFieldType::RO;
-      reset_value(): |
-        return implemented?(ExtensionName::B) ? 1 : 0;
+      definedBy: B
+      reset_value: 1
     C:
       location: 2
       description: |
@@ -46,8 +46,8 @@ misa:
         Additionally, IALIGN becomes 32.
       type(): |
         return (implemented?(ExtensionName::C) && MUTABLE_MISA_C) ? CsrFieldType::RW : CsrFieldType::RO;
-      reset_value(): |
-        return implemented?(ExtensionName::C) ? 1 : 0;
+      definedBy: C
+      reset_value: 1
     D:
       location: 3
       description: |
@@ -61,8 +61,8 @@ misa:
         --
       type(): |
         return (implemented?(ExtensionName::D) && MUTABLE_MISA_D) ? CsrFieldType::RW : CsrFieldType::RO;
-      reset_value(): |
-        return implemented?(ExtensionName::D) ? 1 : 0;
+      definedBy: D
+      reset_value: 1
     F:
       location: 5
       description: |
@@ -76,8 +76,8 @@ misa:
         --
       type(): |
         return (implemented?(ExtensionName::F) && MUTABLE_MISA_F) ? CsrFieldType::RW : CsrFieldType::RO;
-      reset_value(): |
-        return implemented?(ExtensionName::F) ? 1 : 0;
+      definedBy: F
+      reset_value: 1
       sw_write(csr_value): |
         if (csr_value.F == 0 && csr_value.D == 1) {
           return UNDEFINED_LEGAL_DETERMINISTIC;
@@ -115,13 +115,14 @@ misa:
         Writing 0 to this field will cause all attempts to enter VS- or VU- mode, execute a hypervisor instruction, or access a hypervisor CSR to raise an `IllegalInstruction` fault.
       type(): |
         return (implemented?(ExtensionName::H) && MUTABLE_MISA_H) ? CsrFieldType::RW : CsrFieldType::RO;
-      reset_value(): |
-        return implemented?(ExtensionName::H) ? 1 : 0;
+      definedBy: H
+      reset_value: 1
     I:
       location: 8
       description: |
         Indicates support for the `I` (base) extension.
       type: RO
+      definedBy: I
       reset_value: 1
     M:
       location: 13
@@ -132,8 +133,8 @@ misa:
         Writing 0 to this field will cause all attempts to execute an integer multiply or divide instruction to raise an `IllegalInstruction` exception.
       type(): |
         return (implemented?(ExtensionName::M) && MUTABLE_MISA_M) ? CsrFieldType::RW : CsrFieldType::RO;
-      reset_value(): |
-        return implemented?(ExtensionName::M) ? 1 : 0;
+      definedBy: M
+      reset_value: 1
     S:
       location: 19
       description: |
@@ -143,8 +144,8 @@ misa:
         Writing 0 to this field will cause all attempts to enter S-mode or access S-mode state to raise an exception.
       type(): |
         return (implemented?(ExtensionName::S) && MUTABLE_MISA_S) ? CsrFieldType::RW : CsrFieldType::RO;
-      reset_value(): |
-        return implemented?(ExtensionName::S) ? 1 : 0;
+      definedBy: S
+      reset_value: 1
     U:
       location: 21
       description: |
@@ -154,19 +155,18 @@ misa:
         Writing 0 to this field will cause all attempts to enter U-mode to raise an exception.
       type(): |
         return (implemented?(ExtensionName::U) && MUTABLE_MISA_U) ? CsrFieldType::RW : CsrFieldType::RO;
-      reset_value(): |
-        return implemented?(ExtensionName::U) ? 1 : 0;
+      definedBy: U
+      reset_value: 1
     V:
       location: 22
       description: |
         Indicates support for the `V` (vector) extension.
 
-        [when,"MUTABLE_MISA_S == true"]
+        [when,"MUTABLE_MISA_V == true"]
         Writing 0 to this field will cause all attempts to execute a vector instruction to raise an `IllegalInstruction` trap.
       type: RO
-      reset_value: 0 # TODO
-      # reset_value(): |
-      #   return implemented?(ExtensionName::V) ? 1 : 0;
+      definedBy: V
+      reset_value: 1
   sw_read(): |
     return (
       (CSR[misa].MXL << 62) |
diff --git a/backends/crd_doc/templates/crd.adoc.erb b/backends/crd_doc/templates/crd.adoc.erb
index eb1ee3826c..e17221661a 100644
--- a/backends/crd_doc/templates/crd.adoc.erb
+++ b/backends/crd_doc/templates/crd.adoc.erb
@@ -542,7 +542,7 @@ h| Privilege Mode | <%= csr.priv_mode %>
 .<%= csr.name %> format
 [wavedrom, ,svg,subs='attributes',width="100%"]
 ....
-<%= JSON.dump csr.wavedrom_desc(arch_def, csr.base.nil? ? 32 : csr.base, optional_type: 3) %>
+<%= JSON.dump csr.wavedrom_desc(arch_def, csr.base.nil? ? 32 : csr.base, optional_type: 2) %>
 ....
 <% else -%>
 <%# CSR has a dynamic length, or a field has a dynamic location,
@@ -552,13 +552,13 @@ This CSR format changes dynamically with XLEN.
 .<%= csr.name %> Format when <%= csr.length_cond32 %>
 [wavedrom, ,svg,subs='attributes',width="100%"]
 ....
-<%= JSON.dump csr.wavedrom_desc(arch_def, 32, optional_type: 3) %>
+<%= JSON.dump csr.wavedrom_desc(arch_def, 32, optional_type: 2) %>
 ....
 
 .<%= csr.name %> Format when <%= csr.length_cond64 %>
 [wavedrom, ,svg,subs='attributes',width="100%"]
 ....
-<%= JSON.dump csr.wavedrom_desc(arch_def, 64, optional_type: 3) %>
+<%= JSON.dump csr.wavedrom_desc(arch_def, 64, optional_type: 2) %>
 ....
 
 
diff --git a/lib/arch_obj_models/csr.rb b/lib/arch_obj_models/csr.rb
index 0c0ad725f1..3071dc9d91 100644
--- a/lib/arch_obj_models/csr.rb
+++ b/lib/arch_obj_models/csr.rb
@@ -512,7 +512,7 @@ def pruned_sw_read_ast(arch_def)
   # @param exclude_unimplemented [Boolean] If true, do not create include unimplemented fields in the figure
   # @param optional_type [Integer] Wavedrom type (Fill color) for fields that are optional (not mandatory) in a partially-specified arch_def
   # @return [Hash] A representation of the WaveDrom drawing for the CSR (should be turned into JSON for wavedrom)
-  def wavedrom_desc(arch_def, effective_xlen, exclude_unimplemented: false, optional_type: 2)
+  def wavedrom_desc(arch_def, effective_xlen, exclude_unimplemented: false, optional_type: 3)
     desc = {
       "reg" => []
     }
@@ -536,9 +536,10 @@ def wavedrom_desc(arch_def, effective_xlen, exclude_unimplemented: false, option
         desc["reg"] << { "bits" => n, type: 1 }
       end
       if arch_def.partially_configured? && field.optional_in_cfg?(arch_def)
+        puts "#{name}.#{field.name} is OPTIONAL"
         desc["reg"] << { "bits" => field.location(arch_def, effective_xlen).size, "name" => field.name, type: optional_type }
       else
-        desc["reg"] << { "bits" => field.location(arch_def, effective_xlen).size, "name" => field.name, type: 2 }
+        desc["reg"] << { "bits" => field.location(arch_def, effective_xlen).size, "name" => field.name, type: 3 }
       end
       last_idx = field.location(arch_def, effective_xlen).max
     end
@@ -570,7 +571,7 @@ def optional_in_cfg?(arch_def)
     raise "optional_in_cfg? should only be used by a partially-specified arch def" unless arch_def.partially_configured?
 
     exists_in_cfg?(arch_def) &&
-      arch_def.mandatory_extensions.none? do |ext_req|
+      arch_def.mandatory_extensions.all? do |ext_req|
         ext_req.satisfying_versions(arch_def).none? { |ext_ver| defined_by?(ext_ver) }
       end
   end
diff --git a/lib/arch_obj_models/csr_field.rb b/lib/arch_obj_models/csr_field.rb
index 2d0cdd6c1f..ed1d0bfe52 100644
--- a/lib/arch_obj_models/csr_field.rb
+++ b/lib/arch_obj_models/csr_field.rb
@@ -52,7 +52,7 @@ def optional_in_cfg?(arch_def)
     exists_in_cfg?(arch_def) &&
       (
         parent.optional_in_cfg?(arch_def) ||
-        (data["definedBy"].nil? || arch_def.mandatory_extensions.none? do |ext_req|
+        (data["definedBy"].nil? || arch_def.mandatory_extensions.all? do |ext_req|
           ext_req.satisfying_versions(arch_def).none? { |ext_ver| defined_by?(ext_ver) }
         end)
       )
diff --git a/lib/arch_obj_models/extension.rb b/lib/arch_obj_models/extension.rb
index f8675e9425..f63b9f68b7 100644
--- a/lib/arch_obj_models/extension.rb
+++ b/lib/arch_obj_models/extension.rb
@@ -316,6 +316,10 @@ def params(arch_def)
     ext(arch_def).params.select { |p| p.defined_in_extension_version?(@version) }
   end
 
+  def to_s
+    "#{name}@#{version}"
+  end
+
   # @overload ==(other)
   #   @param other [String] An extension name
   #   @return [Boolean] whether or not this ExtensionVersion is named 'other'