Coefficient Readback - Xilinx LogiCORE IP User Manual

Chapter 8: Coefficients
Table 8-12: .coe File Example 3
1 (V) 3 1
1 (V) 3 2
1 (V) - -
- - -

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:
•
•
•
•
•
•
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.
60
32 14099,
33 -544,
34 0;
35 ""
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
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Padding value
Video Scaler v4.0 User Guide
UG805 March 1, 2011