IP Introduction

A typical DUT has 3 set's of interfaces

1. Data Interface
2. Control Interface
3. Configuration Interface

The data interface is used for Data I/O

The control interface is used by other hardware to control or change the behavior of the IP

The configuration interface is used by the processor to change the behavior of the IP.

IP Functionality

• It uses the RDY EN Protocol on all interfaces
• The DUT takes N 8 bit input values. Adds them and outputs the result.
• The Value of N can be provided either
  • At the Interface via the length port
  • Or via the length register accessible via the configuration register.
• The decision on which length is used (port or register) is controlled via a bit in the configuration space.
• Once the DUT starts accumulating the bytes it ignores changes to the length field or register until it has generated the output.

Interfaces

Port	Direction	Width	Description
din_rdy	out	1	RDY for Input data
din_en	in	1	EN for Input data
din_value	in	8	Data
dout_rdy	out	1	RDY for Output data
dout_en	in	1	EN for output data
dout_value	out	8	Accumulated data output
len_rdy	out	1	RDY for Length
len_en	in	1	EN for length
len_value	in	8	Number of bytes that should be accumulated
cfg_rdy	out	1	RDY for Configuration Interface
cfg_en	in	1	EN for Configuration Interface
cfg_address	in	8	Address of the register in cfg space
cfg_op	in	1	Operation type, 0=Read, 1=Write
cfg_data_in	in	32	The data that needs to be written, ignored for read
cfg_data_out	out	32	The data returned by read operation

Configuration Space Register Map

Address	Access	Bit map	reset value	Field	Description
0	R	7:0	0	current_count	The count of bytes processed
0	R	15:8	0	programmed_length	The length programmed for this session
0	R	16	0	busy	An operation has started and is ongoing
4	R/W	0	0	s/w override	0 => use len from port. 1=>use len from register
4	R/W	1	0	pause	0 => normal mode. 1=>Input Rdy will be deasserted after end of current data set.
8	R/W	7:0	0	len	len register