diff --git a/evm/src/lib.rs b/evm/src/lib.rs
index 8e4d6468..422fae29 100644
--- a/evm/src/lib.rs
+++ b/evm/src/lib.rs
@@ -12,6 +12,7 @@ pub mod cross_table_lookup;
 mod get_challenges;
 pub mod keccak;
 pub mod logic;
+pub mod memory;
 pub mod permutation;
 pub mod proof;
 pub mod prover;
diff --git a/evm/src/memory/memory_stark.rs b/evm/src/memory/memory_stark.rs
new file mode 100644
index 00000000..0cc42d30
--- /dev/null
+++ b/evm/src/memory/memory_stark.rs
@@ -0,0 +1,16 @@
+#[derive(Default)]
+pub struct TransactionMemory {
+    pub calls: Vec<ContractMemory>,
+}
+
+/// A virtual memory space specific to the current contract call.
+pub struct ContractMemory {
+    pub code: MemorySegment,
+    pub main: MemorySegment,
+    pub calldata: MemorySegment,
+    pub returndata: MemorySegment,
+}
+
+pub struct MemorySegment {
+    pub content: Vec<u8>,
+}
diff --git a/evm/src/memory/mod.rs b/evm/src/memory/mod.rs
new file mode 100644
index 00000000..53108262
--- /dev/null
+++ b/evm/src/memory/mod.rs
@@ -0,0 +1,2 @@
+pub mod memory_stark;
+pub mod registers;
\ No newline at end of file
diff --git a/evm/src/memory/registers.rs b/evm/src/memory/registers.rs
new file mode 100644
index 00000000..1373d0d8
--- /dev/null
+++ b/evm/src/memory/registers.rs
@@ -0,0 +1,3 @@
+//! Memory unit.
+
+pub(super) const END: usize = super::START_MEMORY;