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| author | Matt Ettus <matt@ettus.com> | 2010-11-11 18:50:49 -0800 |
|---|---|---|
| committer | Matt Ettus <matt@ettus.com> | 2010-11-11 18:50:49 -0800 |
| commit | 78abd7d98a5dc42aeafa89ed29a3ab8a1f9475f4 (patch) | |
| tree | d0fbe6c09fb381aa39551bf0d38f738b8f787472 /usrp2/extramfifo/nobl_if.v | |
| parent | 12c8995014a625aab9a7614d9b146876fbf81268 (diff) | |
| download | uhd-78abd7d98a5dc42aeafa89ed29a3ab8a1f9475f4.tar.gz uhd-78abd7d98a5dc42aeafa89ed29a3ab8a1f9475f4.tar.bz2 uhd-78abd7d98a5dc42aeafa89ed29a3ab8a1f9475f4.zip | |
gray code address for emi
Diffstat (limited to 'usrp2/extramfifo/nobl_if.v')
| -rw-r--r-- | usrp2/extramfifo/nobl_if.v | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/usrp2/extramfifo/nobl_if.v b/usrp2/extramfifo/nobl_if.v index 7ff7eaa03..b5ebe9c6b 100644 --- a/usrp2/extramfifo/nobl_if.v +++ b/usrp2/extramfifo/nobl_if.v @@ -39,6 +39,12 @@ module nobl_if assign RAM_LDn = 0; // ZBT/NoBL RAM actually manages its own output enables very well. assign RAM_OEn = 0; + + // gray code the address to reduce EMI + wire [DEPTH-1:0] address_gray; + + bin2gray #(.WIDTH(DEPTH)) bin2gray (.bin(address),.gray(address_gray)); + // // Pipeline stage 1 @@ -62,7 +68,7 @@ module nobl_if if (enable) begin - address_pipe1 <= address; + address_pipe1 <= address_gray; write_pipe1 <= write; // RAM_WEn <= ~write; // Creates IOB flop |