1. The offline raw data format (version 3) Header Data of one FADC Tail A data set of one FADC. i.e. data of one FADC 32 bits = 1 word 2 words 1536 words (max) 1 word The header includes start marker, data length, data format identifier, FADC id, event id. The tail consists of check sum and delimiter. 3072 strip data Total size of the header and the tail is 3 words × 36 = 108words = 432Bytes= 0.432kByte In case of 5% occupancy on average, the data flow rate is about 11MB/sec at a trigger rate of 1kHz. Pedestal/noise data (1word) and DQM data(12words)

2. Header format (version 3) 0xAA55 (start marker) Data Format Version (4bit) Data length (12bit) FADC crate (1bit), module(7bit) Event number (8bit) Tag for data format specification (8bit) Tag for data format specification DpxU csCP Each character corresponds to 1bit P: Pedestal subtraction if 1 C: CM subtraction if 1 s: data suppression if 1 c: data compress if 1 U: Pedestal and CMS noise update x : reserved Error flag (8bit) p : if1, pedestal and noise data exits for one strip D : if1, DQM data exits Error flag contains the following flags: data invalid, parity error, chip # error, event # error, start bit err, abnormal start bit position, stop bit error, abnormal stop bit position (in total 8bits)

3. Tail (version 3) Check sum 0xA5A5 (stop marker) Pedestal and noise data of one strip Strip # ( 0 ~ 3071) (12bit) 0xC (4bit) Noise (8bit)Pedestal (8bit) This data is added every 10 events. The noise value is multiplied by 4 and the pedestal value is divided by 4.

4. DQM data Chip noise (chip 0) (8bit) CM (chip0) (8bit) Chip noise (chip 1) (8bit) CM (chip1) (8bit) In total 12 words (24chip data) are added in every 1000 events. Both chip noise and CM values are multiplied by 4. In case that this DQM data exist, the additional data size is 48bytes x 36FADC = 1728bytes