参数资料
| 型号： | COREFIR-RM |
| 厂商： | Microsemi SoC |
| 文件页数： | 51/67页 |
| 文件大小： | 0K |
| 描述： | IP MODULE COREFIR |
| 标准包装： | 1 |
| 系列： | * |
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Polyphase Decimation Filter
Multiple Constant Coefficient Sets
In this mode, the filter can switch between k pre-configured coefficient sets. Figure 46 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 that is expected to be used next. Then the switch from the current to the next set takes a single
clock interval. After the switch, the page that used to store the active set is vacant. It can be used for 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 4-bit 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 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. The swapping takes up to four clock intervals. The input
data samples coming after that time will be properly processed.
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 gets filled with a valid set and becomes the active page
after the COEF_ON signal comes in. The core always downloads the coefficient set 0 (COEF_SEL = 0) on
power-on. As a result, the filter uses the coefficient set 0 upon power-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 46 · Coefficient Storage in Multiple Set Mode
Reloadable Coefficients
Similar to Multiple constant set mode, the coefficient ROM contains two pages, Active and Auxiliary. While
the filter engine keeps using coefficients stored in the active page, user circuitry can download a new
reloadable set of coefficients on the auxiliary page. To do so, COEF_REF signal should be asserted and
deasserted and supply the new reloadable coefficients and validity bits to the ports COEFI and
COEFI_VALID, respectively. The coefficients must be supplied in natural order: h 0 , h 1, and so on. 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, pulse the COEF_ON signal that 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.
52
CoreFIR v8.5 Handbook
相关PDF资料 |
PDF描述 |
|---|---|
| COREPCIF-RM | IP MODULE COREPCIF |
| COREU1LL-AR | IP MODULE COREU1LL |
| COREU1PHY-AR | IP MODULE COREU1PHY |
| CORR-8BIT-XM-UT2 | SITE LICENSE IP CORRELATOR XP |
| CP2-GSA-L | CONN SHIELD LOWER TYPE A 22 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| COREFIR-UR | 制造商:ACTEL 制造商全称:Actel Corporation 功能描述:CoreFIR Finite Impulse Response (FIR) Filter Generator |
| COREFIR-XX | 制造商:ACTEL 制造商全称:Actel Corporation 功能描述:CoreFIR Finite Impulse Response (FIR) Filter Generator |
| COREMP7 | 制造商:ACTEL 制造商全称:Actel Corporation 功能描述:CoreMP7 |
| COREPCI-AN | 制造商:ACTEL 制造商全称:Actel Corporation 功能描述:CorePCI v5.41 |
| COREPCI-AR | 制造商:ACTEL 制造商全称:Actel Corporation 功能描述:CorePCI v5.41 |
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