-- VHDL Architecture Map v3 for the Neuromorphic System --
-- This version expands the ONoC to 8 band lanes and reallocates them
-- based on the new system requirements, maintaining the existing hierarchy.
-- It also refines the sump reset logic to include SGI-specific downstream resets.
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
-- A conceptual package for memory-mapped interface signals.
package arm_interface_types is
-- A conceptual type for a 256-bit memory-mapped bus.
type arm_bus_master is record
addr_bus : std_logic_vector(255 downto 0);
write_data : std_logic_vector(255 downto 0);
read_data : std_logic_vector(255 downto 0);
write_en : std_logic;
read_en : std_logic;
end record;
end package arm_interface_types;
use work.arm_interface_types.all;
-- A conceptual package for optical-related signals.
package optical_types is
-- A conceptual type for a single wide, high-speed optical channel.
type optical_channel is record
data : std_logic_vector(127 downto 0);
valid : std_logic;
ready : std_logic;
end record;
-- New array type to handle the eight ONoC band lanes.
type optical_channel_array is array (integer range <>) of optical_channel;
end package optical_types;
use work.optical_types.all;
-- This is the top-level entity representing the system-level map.
entity NeuromorphicSystem_Map is
port (
clk : in std_logic;
reset : in std_logic; -- Top-level system reset
-- ARM Host Interface (memory-mapped) for control
arm_bus : inout arm_bus_master;
-- Optical Network-on-Chip (ONoC) Interfaces for high-speed data
-- Updated to use the new array type for eight band lanes.
optical_in_channels : in optical_channel_array(7 downto 0);
optical_out_channels: out optical_channel_array(7 downto 0)
);
end entity NeuromorphicSystem_Map;
architecture Structural of NeuromorphicSystem_Map is
-- Internal signals for the ONoC data path, now 8 lanes wide.
-- Each lane is 128 bits, so 8 lanes * 128 bits/lane = 1024 bits.
signal onoc_to_core_data_bus : std_logic_vector(1023 downto 0);
signal onoc_to_core_valid : std_logic_vector(7 downto 0);
signal onoc_to_core_ready : std_logic_vector(7 downto 0);
signal core_to_onoc_data_bus : std_logic_vector(1023 downto 0);
signal core_to_onoc_valid : std_logic_vector(7 downto 0);
signal core_to_onoc_ready : std_logic_vector(7 downto 0);
-- New signals for the dedicated lanes to different chipsets.
signal cuda_in_bus : std_logic_vector(255 downto 0); -- 2 lanes * 128 bits
signal cuda_out_bus : std_logic_vector(255 downto 0);
signal tensor_in_bus : std_logic_vector(255 downto 0); -- 2 lanes * 128 bits
signal tensor_out_bus : std_logic_vector(255 downto 0);
signal networking_in_bus : std_logic_vector(127 downto 0); -- 1 lane
signal networking_out_bus : std_logic_vector(127 downto 0);
signal peripherals_in_bus : std_logic_vector(127 downto 0); -- 1 lane
signal peripherals_out_bus : std_logic_vector(127 downto 0);
signal core_onoc_data_in : std_logic_vector(255 downto 0); -- Remaining 2 lanes for core
signal core_onoc_data_out : std_logic_vector(255 downto 0);
signal core_onoc_valid_in : std_logic_vector(1 downto 0);
signal core_onoc_ready_out : std_logic_vector(1 downto 0);
signal core_onoc_valid_out : std_logic_vector(1 downto 0);
signal core_onoc_ready_in : std_logic_vector(1 downto 0);
-- Reset signals and logic.
signal core_aux_reset_state : std_logic;
signal arm_sump_state : std_logic;
signal sump_controlled_reset : std_logic;
-- SGI-defined downstream resets
signal sgi_downstream_flush_rst : std_logic;
signal sgi_downstream_sgi_rst : std_logic;
signal sgi_defined_reset : std_logic;
-- Internal signals for the direct ARM-to-core control path.
signal arm_to_core_control_bus : std_logic_vector(63 downto 0);
signal core_to_arm_status_bus : std_logic_vector(63 downto 0);
-- Component declarations for the main building blocks.
-- All components are updated to reflect the new bus widths and reset requirements.
component ARM_Interface_Controller is
port (
clk, reset : in std_logic;
arm_bus_inout : inout arm_bus_master;
core_control_out : out std_logic_vector(63 downto 0);
core_status_in : in std_logic_vector(63 downto 0);
sump_out : out std_logic;
sgi_downstream_flush_out : out std_logic;
sgi_downstream_sgi_out : out std_logic
);
end component;
component ONoC_Interface is
port (
clk, reset : in std_logic;
optical_in_channels : in optical_channel_array(7 downto 0);
optical_out_channels : out optical_channel_array(7 downto 0);
electrical_in_bus : in std_logic_vector(1023 downto 0);
electrical_in_valid : in std_logic_vector(7 downto 0);
electrical_in_ready : out std_logic_vector(7 downto 0);
electrical_out_bus : out std_logic_vector(1023 downto 0);
electrical_out_valid : out std_logic_vector(7 downto 0);
electrical_out_ready : in std_logic_vector(7 downto 0)
);
end component;
component Neuromorphic_Core is
port (
clk, reset : in std_logic;
sgi_reset : in std_logic;
control_in : in std_logic_vector(63 downto 0);
status_out : out std_logic_vector(63 downto 0);
aux_reset_out : out std_logic;
-- ONoC data buses for the Core's dedicated lanes
onoc_in_bus : in std_logic_vector(255 downto 0);
onoc_in_valid : in std_logic_vector(1 downto 0);
onoc_in_ready : out std_logic_vector(1 downto 0);
onoc_out_bus : out std_logic_vector(255 downto 0);
onoc_out_valid : out std_logic_vector(1 downto 0);
onoc_out_ready : in std_logic_vector(1 downto 0);
-- Dedicated lanes for external chipsets and peripherals
cuda_data_out : out std_logic_vector(255 downto 0);
cuda_data_in : in std_logic_vector(255 downto 0);
tensor_data_out : out std_logic_vector(255 downto 0);
tensor_data_in : in std_logic_vector(255 downto 0);
networking_data_out : out std_logic_vector(127 downto 0);
networking_data_in : in std_logic_vector(127 downto 0);
peripherals_data_out : out std_logic_vector(127 downto 0);
peripherals_data_in : in std_logic_vector(127 downto 0)
);
end component;
begin
-- The system-wide 'sump' reset is now a logical OR of the external reset,
-- the ARM controller's sump signal, AND the new auxiliary reset from the core.
-- This handles the system-level reset.
sump_controlled_reset <= reset or arm_sump_state or core_aux_reset_state;
-- The SGI-defined downstream reset is a separate signal to trigger specific
-- (e.g., non-flush) resets in the core without escalating to a full sump reset.
sgi_defined_reset <= sgi_downstream_sgi_rst;
-- Instantiate the ARM Interface Controller.
U_ARM_Controller : ARM_Interface_Controller
port map (
clk => clk,
reset => sump_controlled_reset,
arm_bus_inout => arm_bus,
core_control_out => arm_to_core_control_bus,
core_status_in => core_to_arm_status_bus,
sump_out => arm_sump_state,
sgi_downstream_flush_out => open, -- This signal is not used in this specific architecture, but kept for future expansion.
sgi_downstream_sgi_out => sgi_downstream_sgi_rst
);
-- Instantiate the ONoC Interface block. It acts as a passive throughpass.
U_ONoC_Interface : ONoC_Interface
port map (
clk => clk,
reset => sump_controlled_reset,
optical_in_channels => optical_in_channels,
optical_out_channels => optical_out_channels,
electrical_in_bus => core_to_onoc_data_bus,
electrical_in_valid => core_to_onoc_valid,
electrical_in_ready => core_to_onoc_ready,
electrical_out_bus => onoc_to_core_data_bus,
electrical_out_valid => onoc_to_core_valid,
electrical_out_ready => onoc_to_core_ready
);
-- Instantiate the Neuromorphic Core block.
U_Neuromorphic_Core : Neuromorphic_Core
port map (
clk => clk,
reset => sump_controlled_reset,
sgi_reset => sgi_defined_reset,
control_in => arm_to_core_control_bus,
status_out => core_to_arm_status_bus,
aux_reset_out => core_aux_reset_state,
-- Core's dedicated lanes
onoc_in_bus => core_onoc_data_in,
onoc_in_valid => core_onoc_valid_in,
onoc_in_ready => core_onoc_ready_out,
onoc_out_bus => core_onoc_data_out,
onoc_out_valid => core_onoc_valid_out,
onoc_out_ready => core_onoc_ready_in,
-- Dedicated lanes for external chipsets and peripherals
cuda_data_out => cuda_out_bus,
cuda_data_in => cuda_in_bus,
tensor_data_out => tensor_out_bus,
tensor_data_in => tensor_in_bus,
networking_data_out => networking_out_bus,
networking_data_in => networking_in_bus,
peripherals_data_out => peripherals_out_bus,
peripherals_data_in => peripherals_in_bus
);
-- Connections for the ONoC allocation.
-- ONoC to Core
onoc_to_core_data_bus(1023 downto 896) <= cuda_in_bus(255 downto 128); -- Lane 7
onoc_to_core_data_bus(895 downto 768) <= cuda_in_bus(127 downto 0); -- Lane 6
onoc_to_core_data_bus(767 downto 640) <= tensor_in_bus(255 downto 128);-- Lane 5
onoc_to_core_data_bus(639 downto 512) <= tensor_in_bus(127 downto 0); -- Lane 4
onoc_to_core_data_bus(511 downto 384) <= networking_in_bus; -- Lane 3
onoc_to_core_data_bus(383 downto 256) <= peripherals_in_bus; -- Lane 2
onoc_to_core_data_bus(255 downto 0) <= core_onoc_data_in; -- Lanes 1 and 0
onoc_to_core_valid(7 downto 0) <= onoc_to_core_valid;
onoc_to_core_ready(7 downto 0) <= onoc_to_core_ready;
-- Core to ONoC
core_to_onoc_data_bus(1023 downto 896) <= cuda_out_bus(255 downto 128);
core_to_onoc_data_bus(895 downto 768) <= cuda_out_bus(127 downto 0);
core_to_onoc_data_bus(767 downto 640) <= tensor_out_bus(255 downto 128);
core_to_onoc_data_bus(639 downto 512) <= tensor_out_bus(127 downto 0);
core_to_onoc_data_bus(511 downto 384) <= networking_out_bus;
core_to_onoc_data_bus(383 downto 256) <= peripherals_out_bus;
core_to_onoc_data_bus(255 downto 0) <= core_onoc_data_out;
core_to_onoc_valid(7 downto 0) <= core_to_onoc_valid;
core_to_onoc_ready(7 downto 0) <= core_to_onoc_ready;
end architecture Structural;
==============================================================================
BIOS Application Description Language (ADL) v3
For Neuromorphic System (VHDL Architecture Map)
==============================================================================
This script is a high-level blueprint for the BIOS/firmware, updated to
match the VHDLv3 architecture. It defines the logical flow and register-level
interactions required to initialize and manage the hardware components,
including the new 8-lane ONoC and the secure, downstream SGI reset states.
==============================================================================
------------------------------------------------------------------------------
Conceptual Hardware Registers
These are memory-mapped registers accessible via the ARM_Interface_Controller.
------------------------------------------------------------------------------
class Registers:
# Sump control register: a single bit to assert/deassert the sump reset.
# Writing 0x1 asserts the sump; writing 0x0 releases it.
SUMP_CONTROL_ADDR = 0x00000001
# Neuromorphic core control register, for direct ARM-to-Core commands.
CORE_CONTROL_ADDR = 0x00000002
# Neuromorphic core status register, for direct Core-to-ARM feedback.
CORE_STATUS_ADDR = 0x00000003
# Error code register for the ARM controller.
ARM_ERROR_ADDR = 0x00000004
# On-Chip Network (ONoC) configuration register. This is now more complex
# to handle the eight separate lanes and their dedicated allocations.
ONOC_CONFIG_ADDR = 0x00000005
# Neuromorphic Core auxiliary reset status register.
# Reading this register tells the ARM if the Core is asserting a reset.
CORE_AUX_RESET_STATUS_ADDR = 0x00000006
# New: SGI-specific reset control register.
# This register asserts a secure, downstream reset that does not propagate
# to the main system sump.
SGI_RESET_CONTROL_ADDR = 0x00000007
# New: SGI-specific reset status register, to verify the state.
SGI_RESET_STATUS_ADDR = 0x00000008
------------------------------------------------------------------------------
Core BIOS Functions (Pseudo-code)
------------------------------------------------------------------------------
def read_register(address):
"""
Simulates a read operation from a memory-mapped register.
"""
print(f"[DEBUG] Reading from address: 0x{address:08X}")
# Return a dummy value for demonstration.
if address == Registers.CORE_AUX_RESET_STATUS_ADDR:
return 0x0 # Assuming core is not asserting reset
if address == Registers.SGI_RESET_STATUS_ADDR:
return 0x0 # Assuming SGI reset is not active
return 0x00000000
def write_register(address, data):
"""
Simulates a write operation to a memory-mapped register.
"""
print(f"[DEBUG] Writing data 0x{data:08X} to address: 0x{address:08X}")
return True
------------------------------------------------------------------------------
ADL: System Initialization and Sump Control
------------------------------------------------------------------------------
def init_system():
"""
This is the main BIOS entry point. It orchestrates the entire
system startup procedure based on the ARM-centric VHDL architecture.
"""
print("--------------------------------------------------")
print("BIOS ADL: Starting System Initialization...")
print("--------------------------------------------------")
# Step 1: Assert the 'sump' reset to ensure a clean state for all
# components (ONoC and Neuromorphic Core).
print("[LOG] Capturing system state: Pre-sump-reset.")
if not assert_sump_reset():
print("FATAL ERROR: Failed to assert sump reset. System halt.")
return False
print("Sump reset asserted. All lower layers are in a known state.")
# Step 2: Perform a basic check of the ARM-to-Core bus.
if not test_arm_interface():
print("FATAL ERROR: ARM-to-Core bus test failed. System halt.")
return False
print("ARM-to-Core interface is operational.")
# Step 3: Configure the 8-lane ONoC.
if not configure_onoc_lanes():
print("ERROR: ONoC configuration failed. Proceeding with caution.")
# Step 4: Release the 'sump' reset.
print("[LOG] Capturing system state: Post-configuration, pre-release.")
if not release_sump_reset():
print("FATAL ERROR: Failed to release sump reset. System halt.")
return False
print("Sump reset released. Components are now active.")
# Step 5: Configure the Neuromorphic Core.
if not configure_core():
print("ERROR: Core configuration failed. Proceeding with caution.")
# Step 6: Monitor and check for any initial errors, including core-initiated resets.
check_and_clear_errors()
check_core_aux_reset()
check_sgi_reset()
print("--------------------------------------------------")
print("BIOS ADL: System Initialization Complete. Ready.")
print("--------------------------------------------------")
return True
def assert_sump_reset():
"""
Asserts the 'sump' bypass reset signal via the ARM's memory-mapped register.
This is the master reset, flushing all state from the Core and ONoC.
"""
if write_register(Registers.SUMP_CONTROL_ADDR, 0x1):
return True
return False
def release_sump_reset():
"""
Releases the 'sump' bypass reset signal via the ARM's memory-mapped register.
"""
if write_register(Registers.SUMP_CONTROL_ADDR, 0x0):
return True
return False
def assert_sgi_reset():
"""
Asserts a secure, SGI-specific downstream reset to the Neuromorphic Core.
This reset is secure and does not escalate to the system-wide sump reset.
"""
if write_register(Registers.SGI_RESET_CONTROL_ADDR, 0x1):
return True
return False
def test_arm_interface():
"""
Performs a simple read/write test to a known register to ensure
the ARM-to-Core bus is functional.
"""
test_pattern = 0x5A5A5A5A
write_register(Registers.CORE_CONTROL_ADDR, test_pattern)
read_value = read_register(Registers.CORE_STATUS_ADDR)
if read_value != 0x00000000:
return True
return False
def configure_onoc_lanes():
"""
Configures the eight-lane ONoC based on the new allocation:
- Lanes 0-1 (Core)
- Lanes 2 (Peripherals)
- Lanes 3 (Networking)
- Lanes 4-5 (Tensor)
- Lanes 6-7 (CUDA)
"""
print("Configuring ONoC for eight-lane, dedicated-path operation...")
# Example: A conceptual configuration word. In a real system, this would be
# a bitmask or complex data structure to route specific lanes.
# The ARM controller would handle this logic.
config_data = 0xCAFEBABEDADAFEED # Example data to configure all 8 lanes
Hide quoted text
if write_register(Registers.ONOC_CONFIG_ADDR, config_data):
return True
return False
def configure_core():
"""
Writes initial configuration values directly to the Neuromorphic Core
via the ARM's memory-mapped bus.
"""
print("Configuring Neuromorphic Core...")
config_data = 0xDEADBEEF
if write_register(Registers.CORE_CONTROL_ADDR, config_data):
return True
return False
def check_and_clear_errors():
"""
Checks for any error flags and logs them.
"""
print("Checking for errors...")
error_code = read_register(Registers.ARM_ERROR_ADDR)
if error_code != 0x00000000:
print(f"WARNING: Error code 0x{error_code:08X} detected. Clearing.")
write_register(Registers.ARM_ERROR_ADDR, 0x0)
else:
print("No errors found.")
def check_core_aux_reset():
"""
Polls the Neuromorphic Core's auxiliary reset status to ensure
it is not unexpectedly asserting a system-wide reset.
"""
reset_status = read_register(Registers.CORE_AUX_RESET_STATUS_ADDR)
if reset_status == 0x1:
print("WARNING: Neuromorphic core is asserting an auxiliary reset.")
else:
print("Neuromorphic core auxiliary reset is not active.")
def check_sgi_reset():
"""
Polls the SGI-defined reset status register.
"""
reset_status = read_register(Registers.SGI_RESET_STATUS_ADDR)
if reset_status == 0x1:
print("SGI-defined reset is currently active.")
else:
print("SGI-defined reset is not active.")
==============================================================================
Debug, Logging, and System Software Reset States
==============================================================================
The VHDLv3 architecture and this corresponding ADL script enable
a form of "time travel debugging" through the careful management of
reset states and logging.
1. System Logging (The "Timeline"):
The [LOG] statements throughout this script represent checkpoints. At
critical junctures—such as before a reset, after configuration, or
following a core self-reset—the system's state can be logged to a
non-volatile memory or an external debug tool. This creates a "timeline"
of events, allowing a developer to trace the system's execution path.
2. Reset States as "Rollback" Points:
- The Sump Reset acts as a "hard reset" or "rewind to zero." It flushes
all state from the Neuromorphic Core and the ONoC, guaranteeing a
pristine, cold-boot state. If a fatal, unrecoverable error occurs,
this is the ultimate rollback to a known-good starting point.
- The SGI-defined Reset is the key to granular, "time-travel" debugging.
It is a secure, separate reset that targets only the Neuromorphic Core.
This means if the core enters an invalid state, it can be securely
reset without affecting the state of other systems, such as the ARM's
software state or the ONoC's configuration. This allows a developer
to "rewind" only the core's state and re-run a specific sequence of
operations, isolating the bug to the core's behavior. The ability to
reset one part of the system while preserving the state of others is
the core of this debugging philosophy.
3. Debugging with Register Access:
- By reading status registers (e.g., CORE_STATUS_ADDR,
CORE_AUX_RESET_STATUS_ADDR), the ARM can detect anomalies and self-
asserted resets from the core.
- The ADL can then trigger an appropriate reset (assert_sgi_reset
or assert_sump_reset) and log the event, creating a clear record of
what went wrong and what action was taken. This allows for post-mortem
analysis and the ability to reproduce failures by replaying the
logged sequence of events.
==============================================================================
==============================================================================
Execution
==============================================================================
init_system()
