TDA2PXEVM: TDA2Px ISS (imaging subsystem) Performance Calculation

Part Number:TDA2PXEVM

Hi,

I found some ISS performance data of TDA2Px at http://www.ti.com/lit/an/sprace3/sprace3.pdf

If ISP and LDC in SIMCOP are processed at the same time, how the total performance can be calculated. Which one of Case 1) and 2) is right?

Case 1) ISP and LDC are processed concurrently
             : total eff. = minimum (88%, 44%) = 44%

Case 2) ISP and LDC are processed sequentially
             : total eff. = (88% x 44%) / (88% + 44%) = 29%

* Conditions: ISP wtih system traffic(eff. 88%) and LDC Bi-Linear Interpolation (eff. 44%) @532MHz

Thanks~