60
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Video Scaler v4.0 User Guide
UG805 March 1, 2011
Chapter 8:
Coefficients
Coefficient Readback
For coefficient verification purposes, a feature of the video scaler allows the user to read
back coefficients in the active coefficient memory.
Dedicated connections are included to facilitate this feature:
•
coef_set_bank_rd_addr(11:8)
: Coefficient set read-address
•
coef_set_bank_rd_addr(1:0)
: Coefficient bank read-address. 00=HY, 01=HC, 10=VY,
11=VC
•
coef_mem_rd_addr(13:8)
: Coefficient phase read-address
•
coef_mem_rd_addr(3:0)
: Coefficient tap read-address
•
coef_mem_output(15:0)
: Coefficient readback output
•
intr_coef_mem_rdbk_rdy
: Output flag indicating that the specified coefficient bank is
ready for reading
Before changing the set and bank read address, the user must set bit 3 of the control register
to 0. Using the
coef_set_bank_rd_addr
, the user provides a set number and bank
number for the coefficients he wants to read back. The user must then activate the new
bank of coefficients by setting bit 3 of the control register to 1. A FIFO is then populated
with that bank of coefficients. Once the
intr_coef_mem_rdbk_rdy
interrupt has gone
high, using
coef_mem_rd_addr
the user must also provide the phase and tap number of
the coefficient he wants to read from that bank. The coefficient will appear at
coef_mem_output
three clk cycles later.
Reading back coefficients does not cause image distortion, and may be executed during
normal operation.
1 (V)
3
1
32
14099,
1 (V)
3
2
33
-544,
1 (V)
-
-
34
0;
Padding value
-
-
-
35
“”
Table 8-12:
.coe File Example 3
Summary of Contents for LogiCORE IP
Page 1: ...LogiCORE IP Video Scaler v4 0 User Guide UG805 March 1 2011...
Page 6: ...Video Scaler v4 0 User Guide www xilinx com UG805 March 1 2011...
Page 14: ...14 www xilinx com Video Scaler v4 0 User Guide UG805 March 1 2011 Preface About This Guide...
Page 18: ...18 www xilinx com Video Scaler v4 0 User Guide UG805 March 1 2011 Chapter 1 Introduction...
Page 20: ...20 www xilinx com Video Scaler v4 0 User Guide UG805 March 1 2011 Chapter 2 Overview...
Page 70: ...70 www xilinx com Video Scaler v4 0 User Guide UG805 March 1 2011 Chapter 9 Performance...
Page 74: ...74 www xilinx com Video Scaler v4 0 User Guide UG805 March 1 2011 Appendix A Use Cases...
Page 92: ...92 www xilinx com Video Scaler v4 0 User Guide UG805 March 1 2011 Appendix B Programmer Guide...
