diff --git a/Cargo.toml b/Cargo.toml
index 867adc5..91f3c34 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,5 +2,5 @@
 
 resolver = "2"
 
-members = ["dot15d4", "dot15d4-cat", "dot15d4-macros"]
+members = ["dot15d4", "dot15d4-cat", "dot15d4-frame", "dot15d4-macros"]
 exclude = ["ensure-no-std", "dot15d4-fuzz"]
diff --git a/dot15d4-cat/Cargo.toml b/dot15d4-cat/Cargo.toml
index 4590246..cdc56e1 100644
--- a/dot15d4-cat/Cargo.toml
+++ b/dot15d4-cat/Cargo.toml
@@ -7,7 +7,7 @@ license = "MIT OR Apache-2.0"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-dot15d4 = { path = "../dot15d4" }
+dot15d4-frame = { path = "../dot15d4-frame" }
 
 colored = "2"
 clap = { version = "4.5.1", features = ["derive"] }
diff --git a/dot15d4-cat/src/main.rs b/dot15d4-cat/src/main.rs
index cd631cf..48f42dc 100644
--- a/dot15d4-cat/src/main.rs
+++ b/dot15d4-cat/src/main.rs
@@ -1,6 +1,6 @@
 use clap::Parser;
 use colored::*;
-use dot15d4::frame::*;
+use dot15d4_frame::*;
 
 struct Writer {
     indent: usize,
diff --git a/dot15d4-frame/Cargo.toml b/dot15d4-frame/Cargo.toml
new file mode 100644
index 0000000..c656e74
--- /dev/null
+++ b/dot15d4-frame/Cargo.toml
@@ -0,0 +1,23 @@
+[package]
+name = "dot15d4-frame"
+version = "0.1.0"
+edition = "2021"
+license = "MIT OR Apache-2.0"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+dot15d4-macros = { path = "../dot15d4-macros" }
+
+bitflags = "2.4.2"
+heapless = "0.8.0"
+
+arbitrary = { version = "1.3.2", features = ["derive"], optional = true }
+
+[dev-dependencies]
+env_logger = "0.11.3"
+log = "0.4.21"
+
+[features]
+std = []
+fuzz = ["arbitrary"]
diff --git a/dot15d4/examples/parsing.rs b/dot15d4-frame/examples/parsing.rs
similarity index 97%
rename from dot15d4/examples/parsing.rs
rename to dot15d4-frame/examples/parsing.rs
index 9ad19c8..5d4808b 100644
--- a/dot15d4/examples/parsing.rs
+++ b/dot15d4-frame/examples/parsing.rs
@@ -1,4 +1,4 @@
-use dot15d4::frame::*;
+use dot15d4_frame::*;
 
 fn main() {
     env_logger::init();
diff --git a/dot15d4/src/frame/addressing.rs b/dot15d4-frame/src/addressing.rs
similarity index 100%
rename from dot15d4/src/frame/addressing.rs
rename to dot15d4-frame/src/addressing.rs
diff --git a/dot15d4/src/frame/aux_sec_header.rs b/dot15d4-frame/src/aux_sec_header.rs
similarity index 100%
rename from dot15d4/src/frame/aux_sec_header.rs
rename to dot15d4-frame/src/aux_sec_header.rs
diff --git a/dot15d4/src/frame/frame_control.rs b/dot15d4-frame/src/frame_control.rs
similarity index 100%
rename from dot15d4/src/frame/frame_control.rs
rename to dot15d4-frame/src/frame_control.rs
diff --git a/dot15d4/src/frame/ie/headers.rs b/dot15d4-frame/src/ie/headers.rs
similarity index 99%
rename from dot15d4/src/frame/ie/headers.rs
rename to dot15d4-frame/src/ie/headers.rs
index 8ca2243..e1a58ba 100644
--- a/dot15d4/src/frame/ie/headers.rs
+++ b/dot15d4-frame/src/ie/headers.rs
@@ -1,7 +1,7 @@
 //! IEEE 802.15.4 Header Information Element reader and writers.
 
-use crate::frame::{Error, Result};
 use crate::time::Duration;
+use crate::{Error, Result};
 use dot15d4_macros::frame;
 
 /// A reader/writer for the IEEE 802.15.4 Header Information Elements
diff --git a/dot15d4/src/frame/ie/mod.rs b/dot15d4-frame/src/ie/mod.rs
similarity index 100%
rename from dot15d4/src/frame/ie/mod.rs
rename to dot15d4-frame/src/ie/mod.rs
diff --git a/dot15d4/src/frame/ie/nested.rs b/dot15d4-frame/src/ie/nested.rs
similarity index 100%
rename from dot15d4/src/frame/ie/nested.rs
rename to dot15d4-frame/src/ie/nested.rs
diff --git a/dot15d4/src/frame/ie/payloads.rs b/dot15d4-frame/src/ie/payloads.rs
similarity index 100%
rename from dot15d4/src/frame/ie/payloads.rs
rename to dot15d4-frame/src/ie/payloads.rs
diff --git a/dot15d4/src/frame/mod.rs b/dot15d4-frame/src/lib.rs
similarity index 99%
rename from dot15d4/src/frame/mod.rs
rename to dot15d4-frame/src/lib.rs
index d3aac7c..7d6f1b6 100644
--- a/dot15d4/src/frame/mod.rs
+++ b/dot15d4-frame/src/lib.rs
@@ -19,7 +19,7 @@
 //! ## Reading a frame
 //! For an incoming frame, use the [`Frame`] structure to read its content.
 //! ```
-//! # use dot15d4::frame::{
+//! # use dot15d4_frame::{
 //! #   Frame,
 //! #   FrameControl,
 //! #   FrameType,
@@ -175,9 +175,13 @@
 //! [`payload_information_elements`]: InformationElements::payload_information_elements
 //! [`nested_information_elements`]: PayloadInformationElement::nested_information_elements
 
+#![cfg_attr(not(any(test, feature = "std")), no_std)]
+
 #[cfg(test)]
 mod tests;
 
+mod time;
+
 mod frame_control;
 pub use frame_control::*;
 
diff --git a/dot15d4/src/frame/repr/addressing.rs b/dot15d4-frame/src/repr/addressing.rs
similarity index 100%
rename from dot15d4/src/frame/repr/addressing.rs
rename to dot15d4-frame/src/repr/addressing.rs
diff --git a/dot15d4/src/frame/repr/aux_sec_header.rs b/dot15d4-frame/src/repr/aux_sec_header.rs
similarity index 100%
rename from dot15d4/src/frame/repr/aux_sec_header.rs
rename to dot15d4-frame/src/repr/aux_sec_header.rs
diff --git a/dot15d4/src/frame/repr/builder.rs b/dot15d4-frame/src/repr/builder.rs
similarity index 99%
rename from dot15d4/src/frame/repr/builder.rs
rename to dot15d4-frame/src/repr/builder.rs
index 81dd6d2..1b561dd 100644
--- a/dot15d4/src/frame/repr/builder.rs
+++ b/dot15d4-frame/src/repr/builder.rs
@@ -1,6 +1,6 @@
 use super::*;
-use crate::frame::{Address, AddressingMode, FrameType, FrameVersion};
-use crate::frame::{Error, Result};
+use crate::{Address, AddressingMode, FrameType, FrameVersion};
+use crate::{Error, Result};
 
 pub struct Beacon;
 pub struct EnhancedBeacon;
diff --git a/dot15d4/src/frame/repr/frame_control.rs b/dot15d4-frame/src/repr/frame_control.rs
similarity index 100%
rename from dot15d4/src/frame/repr/frame_control.rs
rename to dot15d4-frame/src/repr/frame_control.rs
diff --git a/dot15d4/src/frame/repr/ie/headers.rs b/dot15d4-frame/src/repr/ie/headers.rs
similarity index 100%
rename from dot15d4/src/frame/repr/ie/headers.rs
rename to dot15d4-frame/src/repr/ie/headers.rs
diff --git a/dot15d4/src/frame/repr/ie/mod.rs b/dot15d4-frame/src/repr/ie/mod.rs
similarity index 100%
rename from dot15d4/src/frame/repr/ie/mod.rs
rename to dot15d4-frame/src/repr/ie/mod.rs
diff --git a/dot15d4/src/frame/repr/ie/nested.rs b/dot15d4-frame/src/repr/ie/nested.rs
similarity index 100%
rename from dot15d4/src/frame/repr/ie/nested.rs
rename to dot15d4-frame/src/repr/ie/nested.rs
diff --git a/dot15d4/src/frame/repr/ie/payloads.rs b/dot15d4-frame/src/repr/ie/payloads.rs
similarity index 100%
rename from dot15d4/src/frame/repr/ie/payloads.rs
rename to dot15d4-frame/src/repr/ie/payloads.rs
diff --git a/dot15d4/src/frame/repr/mod.rs b/dot15d4-frame/src/repr/mod.rs
similarity index 100%
rename from dot15d4/src/frame/repr/mod.rs
rename to dot15d4-frame/src/repr/mod.rs
diff --git a/dot15d4/src/frame/tests.rs b/dot15d4-frame/src/tests.rs
similarity index 100%
rename from dot15d4/src/frame/tests.rs
rename to dot15d4-frame/src/tests.rs
diff --git a/dot15d4-frame/src/time.rs b/dot15d4-frame/src/time.rs
new file mode 100644
index 0000000..b0656bd
--- /dev/null
+++ b/dot15d4-frame/src/time.rs
@@ -0,0 +1,102 @@
+//! Time structures.
+//!
+//! - [`Instant`] is used to represent a point in time.
+//! - [`Duration`] is used to represent a duration of time.
+
+#[derive(Clone, Copy, Debug, PartialEq, PartialOrd, Eq, Ord)]
+#[cfg_attr(feature = "fuzz", derive(arbitrary::Arbitrary))]
+pub struct Instant {
+    us: i64,
+}
+
+impl Instant {
+    pub const fn from_us(us: i64) -> Self {
+        Self { us }
+    }
+
+    pub const fn as_us(&self) -> i64 {
+        self.us
+    }
+}
+
+impl core::fmt::Display for Instant {
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+        write!(f, "{:.2}ms", self.as_us() as f32 / 1000.0)
+    }
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, PartialOrd, Eq, Ord)]
+#[cfg_attr(feature = "fuzz", derive(arbitrary::Arbitrary))]
+pub struct Duration(i64);
+
+impl Duration {
+    pub const fn from_us(us: i64) -> Self {
+        Self(us)
+    }
+
+    pub const fn as_us(&self) -> i64 {
+        self.0
+    }
+}
+
+impl core::fmt::Display for Duration {
+    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
+        write!(f, "{:.2}ms", self.as_us() as f32 / 1000.0)
+    }
+}
+
+impl core::ops::Sub for Instant {
+    type Output = Self;
+
+    fn sub(self, rhs: Instant) -> Self::Output {
+        Self::from_us(self.as_us() - rhs.as_us())
+    }
+}
+
+impl core::ops::Sub<Duration> for Instant {
+    type Output = Self;
+
+    fn sub(self, rhs: Duration) -> Self::Output {
+        Self::from_us(self.us - rhs.as_us())
+    }
+}
+
+impl core::ops::Sub for Duration {
+    type Output = Self;
+
+    fn sub(self, rhs: Duration) -> Self::Output {
+        Self::from_us(self.as_us() - rhs.as_us())
+    }
+}
+
+impl core::ops::Mul<usize> for Duration {
+    type Output = Self;
+
+    fn mul(self, rhs: usize) -> Self::Output {
+        Self::from_us(self.as_us() * rhs as i64)
+    }
+}
+
+impl core::ops::Add<Duration> for Instant {
+    type Output = Self;
+
+    fn add(self, rhs: Duration) -> Self::Output {
+        Self::from_us(self.us + rhs.as_us())
+    }
+}
+
+impl core::ops::Div<usize> for Duration {
+    type Output = Self;
+
+    fn div(self, rhs: usize) -> Self::Output {
+        Self::from_us(self.as_us() / rhs as i64)
+    }
+}
+
+impl core::ops::Add<Duration> for Duration {
+    type Output = Self;
+
+    fn add(self, rhs: Duration) -> Self::Output {
+        Self::from_us(self.as_us() + rhs.as_us())
+    }
+}
diff --git a/dot15d4-fuzz/Cargo.toml b/dot15d4-fuzz/Cargo.toml
index c7da94b..e0bf6f9 100644
--- a/dot15d4-fuzz/Cargo.toml
+++ b/dot15d4-fuzz/Cargo.toml
@@ -9,4 +9,4 @@ license = "MIT OR Apache-2.0"
 [dependencies]
 afl = "0.15.3"
 arbitrary = { version = "1.3.2", features = ["derive"] }
-dot15d4 = { path = "../dot15d4", features = ["std", "fuzz"] }
+dot15d4-frame = { path = "../dot15d4-frame", features = ["std", "fuzz"] }
diff --git a/dot15d4-fuzz/src/bin/frame.rs b/dot15d4-fuzz/src/bin/frame.rs
index fb2b1bc..d996128 100644
--- a/dot15d4-fuzz/src/bin/frame.rs
+++ b/dot15d4-fuzz/src/bin/frame.rs
@@ -1,5 +1,5 @@
 use afl::*;
-use dot15d4::frame::{Frame, FrameRepr};
+use dot15d4_frame::{Frame, FrameRepr};
 
 fn main() {
     fuzz!(|data: &[u8]| {
diff --git a/dot15d4-fuzz/src/bin/repr.rs b/dot15d4-fuzz/src/bin/repr.rs
index d339976..2b253f2 100644
--- a/dot15d4-fuzz/src/bin/repr.rs
+++ b/dot15d4-fuzz/src/bin/repr.rs
@@ -1,5 +1,5 @@
 use afl::*;
-use dot15d4::frame::{Frame, FrameRepr};
+use dot15d4_frame::{Frame, FrameRepr};
 
 fn main() {
     fuzz!(|repr: FrameRepr| {
diff --git a/dot15d4/Cargo.toml b/dot15d4/Cargo.toml
index 4f56568..5696243 100644
--- a/dot15d4/Cargo.toml
+++ b/dot15d4/Cargo.toml
@@ -7,19 +7,15 @@ license = "MIT OR Apache-2.0"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-dot15d4-macros = { path = "../dot15d4-macros" }
+dot15d4-frame = { path = "../dot15d4-frame" }
 
 log = { version = "0.4.21", optional = true }
 defmt = { version = "0.3", optional = true }
 
-bitflags = "2.4.2"
-heapless = "0.8.0"
 critical-section = "1.1"
 rand_core = { version = "0.6.4", default-features = false }
 embedded-hal-async = { version = "1.0.0" }
 
-arbitrary = { version = "1.3.2", features = ["derive"], optional = true }
-
 [dev-dependencies]
 critical-section = { version = "1.1", features = ["std"] }
 env_logger = "0.11.3"
@@ -35,5 +31,3 @@ default = ["std"]
 log = ["dep:log"]
 ## Use defmt for logging
 defmt = ["dep:defmt"]
-
-fuzz = ["std", "arbitrary"]
diff --git a/dot15d4/src/csma/mod.rs b/dot15d4/src/csma/mod.rs
index 76ea835..e395bef 100644
--- a/dot15d4/src/csma/mod.rs
+++ b/dot15d4/src/csma/mod.rs
@@ -9,7 +9,6 @@ use rand_core::RngCore;
 use user_configurable_constants::*;
 
 use crate::{
-    frame::{Address, Frame, FrameBuilder, FrameType},
     phy::{
         config::{RxConfig, TxConfig},
         driver::{self, Driver, FrameBuffer},
@@ -28,6 +27,7 @@ use crate::{
     },
     time::Duration,
 };
+use dot15d4_frame::{Address, Frame, FrameBuilder, FrameType};
 
 #[cfg_attr(feature = "defmt", derive(defmt::Format))]
 #[derive(Debug, Clone, Copy)]
diff --git a/dot15d4/src/lib.rs b/dot15d4/src/lib.rs
index 5ce8654..8cfb8c1 100644
--- a/dot15d4/src/lib.rs
+++ b/dot15d4/src/lib.rs
@@ -3,8 +3,9 @@
 #[macro_use]
 pub(crate) mod utils;
 
+pub use dot15d4_frame as frame;
+
 pub mod csma;
-pub mod frame;
 pub mod phy;
 pub mod sync;
 pub mod time;