Summarise the points needed for AHB Slave Interface Implementation

[anupam.jain21]

hi,

I have to implement a AHB slave interface which supports SPLIT.
This is what i have done :
1) When the Hsel =LOW or Hreadyin =LOW . Do nothing.Respond with
Hresp=OK and Hreadyout=HIGH.
2) When the Hsel=HIGH and Hreadyin=HIGH . If Htrans = NSEQ or SEQ ,If
Hwrite =HIGH ,write what is present on the data line at the address
given by Haddr and read in case of Hwrite= LOW.
3) When Hsel=HIGH,Hreadyin=HIGH and Htrans =IDLE or BUSY. Do nothing
..respnd with Hresp =OK and Hreadyout=HIGH.
3)If Hsize is other than 32 bit transfer,respond with the Hresp=ERROR
and Hreadyout=HIGH.
4)To split,respond with Hresp=SPLIT and record the master number.
5)To release the SPLIT, assert the appropriate line on HSPLIT.

This is all i have done and i think i have missed some points.Can
anyone help me point out some of those?

regards,
Anupam Jain

 

[Mike Treseler]

This is all i have done and i think i have missed some points.

write code, run a sim and verify to the specs, repeat


-- Mike Treseler

 

[Tarang]

Hi Anupam,
Please read the inlime comments.

hi,

I have to implement a AHB slave interface which supports SPLIT.
This is what i have done :
1) When the Hsel =LOW or Hreadyin =LOW . Do nothing.Respond with
Hresp=OK and Hreadyout=HIGH. ok.
2) When the Hsel=HIGH and Hreadyin=HIGH . If Htrans = NSEQ or SEQ ,If
Hwrite =HIGH ,write what is present on the data line at the address
given by Haddr and read in case of Hwrite= LOW. ok.
3) When Hsel=HIGH,Hreadyin=HIGH and Htrans =IDLE or BUSY. Do nothing
.respnd with Hresp =OK and Hreadyout=HIGH. ok.
3)If Hsize is other than 32 bit transfer,respond with the Hresp=ERROR
and Hreadyout=HIGH.

Giving Error Responsce is fine. But you have to take care for the
Hreadyout signal. When ever error response is given , hreadyout should
remail low for the one clock cycle and high for once clock cycle for
the ERROR response.
Please refer the "Topic 3.9.3 "two-cycle response " " for the more
detials and the reason behind this.

4)To split,respond with Hresp=SPLIT and record the master number.
5)To release the SPLIT, assert the appropriate line on HSPLIT. ok.
This is all i have done and i think i have missed some points.Can
anyone help me point out some of those?

done !

Regards,
Tarang Popat.

 

[anupam.jain21]

Hi Anupam,
Please read the inlime comments.

Giving Error Responsce is fine. But you have to take care for the
Hreadyout signal. When ever error response is given , hreadyout should
remail low for the one clock cycle and high for once clock cycle for
the ERROR response.
Please refer the "Topic 3.9.3 "two-cycle response " " for the more
detials and the reason behind this.

done !

Regards,
Tarang Popat.

Hi,

The Handling of Hreadyout is not an issue as this is going to be a
behavioural code for the first level and so there is no timing for
now.This will an important point during implementation of RTL.

regards,
Anupam Jain