Entity: dstruct_stack

File: dstruct_stack.vhdl

Diagram

Description

EMACS settings: -- tab-width: 2; indent-tabs-mode: t -- vim: tabstop=2:shiftwidth=2:noexpandtab

kate: tab-width 2; replace-tabs off; indent-width 2;

Authors: Jens Voss

Entity: Stack (LIFO)

Description:

Implements a stack, a LIFO storage abstraction.

License:

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

         http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and

limitations under the License.

Generics

Generic name	Type	Value	Description
D_BITS	positive		Data Width
MIN_DEPTH	positive		Minimum Stack Depth

Ports

Port name	Direction	Type	Description
clk	in	std_logic	INPUTS
rst	in	std_logic	INPUTS
din	in	std_logic_vector(D_BITS-1 downto 0)	Data Input
put	in	std_logic	0 -> pop, 1 -> push
full	out	std_logic
got	in	std_logic	Read Ports
dout	out	std_logic_vector(D_BITS-1 downto 0)
valid	out	std_logic

Signals

Name	Type	Description
stackpointer	unsigned(A_BITS-1 downto 0)	Signals
we	std_logic
adr	unsigned(A_BITS-1 downto 0)
s_adr	unsigned(A_BITS-1 downto 0)
s_dout	std_logic_vector(D_BITS-1 downto 0)
s_valid	std_logic
s_din	std_logic_vector(D_BITS-1 downto 0)
ctrl	ctrl_t
current_state	state
next_state	state

Constants

Name	Type	Value	Description
A_BITS	natural	log2ceil(MIN_DEPTH)

Types

Name	Type	Description
ctrl_t	(PUSH, POP, IDLE)	ctrl signal for stackpointer operations
state	(SEMPTY, NOTFULL, WAITING, SFULL)

Processes

unnamed: ( clk )

unnamed: ( current_state, put, stackpointer, got )

unnamed: ( clk )

Instantiations

ram: poc.ocram_sp