Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

AMBA AHB HREADYOUT signal

Status
Not open for further replies.
S

shaiko

Advanced Member level 5
Joined
Aug 20, 2011
Messages
2,644
Helped
303
Reputation
608
Reaction score
297
Trophy points
1,363
Activity points
18,302
Hello,

I have a question about the HREADYOUT signal of an AMBA AHB slave:
Is it allowable for the slave to drive the HREADYOUT signal low (HREADY <= '0') when it's not being addressed by any master?
Or must it assert an HREADYOUT <= '1' when it's not being addressed.

This is strictly a protocol compliance question - this would dictate the default state machine value for the HREADYOUT signal.
Or in other words - the HREADYOUT value at the "idle_state" of the FSM.

Does anyone know the answer?
Do the specs dictate such a value? or it's up to the designer to decide?
 

Can anyone answer my simple question?
 

shaiko said:
Can anyone answer my simple question?
Click to expand...
Default value of hready in the idle state of the fsm has to be 1 and hresp must be set to ok.
From the starting of the next state(ie read or write state)the slave should set hready to 0 and hresp is still ok
Again In the transfer state the slave will make the hready to high.
 
dll_fpga, i did n't get your point. Shaiku did you get it? If so, can you explain it to me as well. I am also unclear about HREADY and HREADYOUT signals
 

hready signal is the only signasl based on which master changes the address and control signals ....so the default value has to be 1....so that first transfer can be initiated by the master upon reset...hope u got
tariq786 said:
dll_fpga, i did n't get your point. Shaiku did you get it? If so, can you explain it to me as well. I am also unclear about HREADY and HREADYOUT signals
Click to expand...
 
Last edited:
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top