In the Youtube video found on the Event-Based Concepts, it is mentioned that all pixels from the same rows are read simultaneously and their corresponding events will share the same timestamp.

I have an EVK4 (IMX636) and the datasheet says the sensor size is 1280 (H) x 720 (V).

Am I right in assuming the rows are along the horizontal (H) dimension? Meaning for any given row index (between 0 and 719), all the 1280 pixels are read together. In other words, IMX636 has 720 rows and 1280 columns.