Mesa 5i21 Xilinx

[Martin]

Hi, I´m new to card using Xilinx chips. I´m developping a new vhd
prgogram, and on one Mesa example, at the very beginning of the code,
the following statements appear:

entity main is
port
(
-- bus interface signals --
LW_R: in std_logic;
DEN: in std_logic;
ADS: in std_logic;
BLAST: in std_logic;
WAITO: in std_logic;
READY: out std_logic;
INT: out std_logic;
HOLD: in std_logic;
HOLDA: inout std_logic;
RESET: in std_logic;
DISABLECONF: out std_logic;
DREQ: in std_logic;
DACK: in std_logic;
CCS: out std_logic;
INIT: out std_logic;

LAD: inout std_logic_vector (31 downto 0); -- data/address bus
lBE: in std_logic_vector (3 downto 0); -- byte enables

CHANDATA: inout std_logic_vector (31 downto 0);
RXEN: out std_logic_vector (15 downto 0);
TXEN: out std_logic_vector (15 downto 0);
LCLK: in std_logic;

-- led bits
LEDS: out std_logic_vector(7 downto 0)

);
end main;


CHANDATA refears to the I/O card signals, but I woul like to know what
are the others signals for. Are they internal signals, and no need of
manipulation is requiered?

thanks in advance,

Martin

 

[ghelbig]

Hi, I´m new to card using Xilinx chips. I´m developping a new vhd
prgogram, and on one Mesa example, at the very beginning of the code,
the following statements appear:

entity main is
port
(
-- bus interface signals --
LW_R: in std_logic;
DEN: in std_logic;
ADS: in std_logic;
BLAST: in std_logic;
WAITO: in std_logic;
READY: out std_logic;
INT: out std_logic;
HOLD: in std_logic;
HOLDA: inout std_logic;
RESET: in std_logic;
DISABLECONF: out std_logic;
DREQ: in std_logic;
DACK: in std_logic;
CCS: out std_logic;
INIT: out std_logic;

LAD: inout std_logic_vector (31 downto 0); -- data/address bus
lBE: in std_logic_vector (3 downto 0); -- byte enables

CHANDATA: inout std_logic_vector (31 downto 0);
RXEN: out std_logic_vector (15 downto 0);
TXEN: out std_logic_vector (15 downto 0);
LCLK: in std_logic;

-- led bits
LEDS: out std_logic_vector(7 downto 0)

);
end main;

CHANDATA refers to the I/O card signals, but I would like to know what
are the others signals for. Are they internal signals, and no need of
manipulation is required?

thanks in advance,

Martin

No offense, but, your question indicates that you are just learning
VHDL.

This should help: <http://www.amazon.com/gp/product/
1558605207/103-4357423-2097418>