here is the datasheet for the device http://www.datasheetcatalog.com/datasheets_pdf/T/S/L/1/TSL1401R.shtml
it suggests that a microcontroller should control the clock line.
send a high pulse to the clock, then a high pulse to s1.
bring them both low again.
send the clock high and low 128 times.
for each pulse on the clock line, the a0 pin will output an analog voltage for the next sensor inline until youve read all 128 sensors.
rinse and repeat