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Folded Filter Implementation Details
Multiple Constant Coefficient Sets
In this mode the filter can switch between k pre-configured coefficient sets. Figure 26 shows the coefficient
ROM in this mode. The core maintains two “cache”-style pages where it is convenient to store the current
set and the set to be used next. Then the switch from a current set to the next one takes a single clock
interval. After the switch, the page that is used to store the former current set gets vacant. This can be used
to fill-in with the yet next coefficient set.
CoreFIR automatically configures a coefficient ROM to use dual-page memory in Multiple set or Reloadable
mode. The COEF_SEL input controls a MUX that selects one of the constant coefficient sets. On asserting
and deasserting the COEF_REF signal, the core starts copying the selected set on the auxiliary page of the
ROM. In the meantime, the filter engine keeps using the current coefficient set stored on the active page.
Once the copying is completed, the core issues the optional signal COEF_REF_DONE, but the coefficients
are not propagated to the filter engine yet. This only takes place when the COEF_ON signal is issued, which
swaps active and auxiliary pages.
After initial power-up, the active page does not contain any coefficient set. Therefore, the core does not
produce a meaningful result until the auxiliary page is filled with a valid set and becomes the active page
after the COEF_ON signal comes in.
When the signal COEF_ON swaps the active and auxiliary pages, generally the PHY_TAPS filtered results
immediately following the COEF_ON, are incorrect and required to be discarded. If this is of concern, loop
back the COEF_ON_SLOT signal as the COEF_ON.
Coefficient ROM
COEF_ON
swap pages
Active Page
MAC Engine
c(i)_set_0
c(i)_set_1
c(i)_set_2
...
COEF_SEL
Auxiliary Page
c(i)_set_k
COEF_REF
COEF_REF_DONE
Figure 26 · Two-Page Coefficient Storage in Multiple Set Mode
Reloadable Coefficients
Similar to ultiple constant set mode, the coefficient ROM contains two pages, Active and Auxiliary. While the
filter engine keeps using coefficients stored in the active page, a new reloadable set of coefficients can be
downloaded by the user circuitry on the auxiliary page. To do so, assert and deassert the COEF_REF signal
and supply the new reloadable coefficients and validity bits to the COEFI and COEFI_VALID ports. The
coefficients must be supplied in reverse order: the coefficient c(N-1) first, followed by c(N-2), and so on until
the last coefficient c(0) is supplied. Once TAPS number of coefficients is loaded, the core issues the optional
signal COEF_REF_DONE. For the filter MAC engine to switch to the just loaded coefficients, assert the
COEF_ON signal, which swaps the pages.
After initial power-up, the active page does not contain any meaningful coefficients. Therefore, the core does
not produce a valid result until the auxiliary page is filled with a valid set of reloadable coefficients and
becomes the active page after the COEF_ON signal comes in.
CoreFIR v8.5 Handbook
31
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