TIP: Click on bit fields to see definition.

CFT/CPSA Protocols and Definitions for L1 Transfers

Data Transfer between the DFEA and the CTOC

  27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Frame Control Bits TP Third Byte Second Byte First Byte
HF 1 1 1 TP P/M OCT 0 0 0 0 0 0 0 RAS DATA TYPE L1/L2
F2 0 0 0 TP XPT+LC XPT-LC 0 0 XPT+TC XPT-TC 0 0 XPT+NC XPT-NC 0 0
F3 0 0 0 TP HPT+LC HPT-LC 0 0 HPT+TC HPT-TC 0 0 HPT+NC HPT-NC TPSCL
F4 0 0 0 TP MPT+LC MPT-LC 0 0 MPT+TC MPT-TC 0 0 MPT+NC MPT-NC LPSCL
F5 0 0 0 TP LPT+LC LPT-LC 0 0 LPT+TC LPT-TC 0 0 LPT+NC LPT-NC 0 0
F6 0 0 0 TP SUM ABS[Pt] 0 0 OCCUPANCY S. ISOLATED TRACK
TF 0 0 0 0 VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP

Data Transfer between the CTOC and the CTTT

  27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Frame Control Bits TP Third Byte Second Byte First Byte
HF 1 1 1 TP XPT+LC XPT-LC XPT+TC XPT-TC XPT+NC XPT-NC P/M GI L1/L2
F2 0 0 0 TP HPT+LC HPT-LC HPT+TC HPT-TC HPT+NC HPT-NC OCT OL Reserved
F3 0 0 0 TP MPT+LC MPT-LC MPT+TC MPT-TC MPT+NC MPT-NC 0 0 T1 T2 #PSCL
F4 0 0 0 TP LPT+LC LPT-LC LPT+TC LPT-TC LPT+NC LPT-NC SUM ABS[Pt]
F5 0 0 0 TP OCT ISOLATED TRACK OCT ISOLATED TRACK OCT ISOLATED TRACK
F6 0 0 0 TP OCT RAS HTPTS 0 OCT ISOLATED TRACK OCT ISOLATED TRACK
TF 0 0 0 0 VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP

CFT Protocols and Definitions for L2 Transfers

The number of data frames sent in L2 mode are not fixed as in L1 mode, instead they can vary between 0 to 24. In case of STSX -> L2 STT the number of data frames varies between 0 to 32.

Data Transfer between the DFEA and the CTOC, STOV, STSX

  27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Frame Control Bits TP Third Byte Second Byte First Byte
HF 1 1 1 TP P/M OCT VP #OBJ HP #OBJ MSB of # OBJ LSB of # OBJ Data Type Code L1/L2
HF 0 0 0 TP Turn Number Crossing Number
DATA 0 0 0 TP PSC RA Tk RA T L S Pt Bin Ext. Pt R CFT H-layer RA ISO
… 0 0 0 TP …………
TF 0 0 0 0 VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP

Data Transfer between L2 CTOC and CTQD

  27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Frame Control Bits TP Third Byte Second Byte First Byte
HF 1 1 1 TP P/M OCT VP #OBJ HP #OBJ MSB of # OBJ LSB of # OBJ Data Type Code L1/L2
HF 0 0 0 TP Turn Number Crossing Number
DATA 0 0 0 TP PSC RA Tk RA T L S Pt Bin Ext. Pt R CFT H-layer RA ISO
… 0 0 0 TP …………
TF 0 0 0 0 VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP VP

Data Transfer between CTQD and L2 CFTpp (G-Link)

Only the data format is shown. For the complete record (which includes header and trailer information) please look at "Record Layout for G-Link Transfers" below.

15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Control
Bits		 Second Byte First Byte
DATA 0 0 0 0 S Pt Bin Ext. Pt T L Error Code R PSC RA
0 0 0 0 CFT H-layer RA ISO 0 0 Abs. Sector Address of Track

Data Transfer between STOV and STSX

Due to limited availability of bit positions the "V" bit has to be replaced by the "D" bit in the data frames.

  27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
Frame Control Bits TP Third Byte Second Byte First Byte
HF 1 1 1 TP P/M STOV VP #OBJ HP #OBJ