PRIN.TXT - byte offsets ------------------------------------------------- |15 14 13 12|11 10 9 8| 7 6 5 4| 3 2 1 0| PC bit numbering ------------|-----------|-----------|-----------| | 0 1 2 3| 4 5 6 7| 8 9 10 11|12 13 14 15| UUT bit numbering ------------------------------------------------- NORMAL MESSAGES byte 1 RTtoBC 2 BCtoRT 3 RTtoRT 4 MCw/o 5 MCxmt 6 MCrec ---- --------- --------- --------- --------- --------- --------- 00 | LBW | | DW1 | | TCW | | LBW | | LBW | | DW1 | --------- --------- --------- --------- --------- --------- 02 | MSW | | DW2 | | LBW | | MSW | | MSW | | LBW | --------- --------- --------- --------- --------- --------- 04 | DW1 | | DW3 | | MSW | | DW1 | | MSW | --------- --------- --------- --------- --------- 06 | DW2 | | DW4 | | DW1 | where: --------- --------- --------- : : : : : : TCW = transmit command word --------- --------- --------- RCW = receive command word 2n-2 | DWn-2 | | DWn | | DWn-3 | TMC = tramsmit mode code --------- --------- --------- RCW = receive mode code 2n | DWn-1 | | LBW | | DWn-2 | RBC = receive broadcast --------- --------- --------- TBM = transmit broadcast mode 2n+2 | DWN | | MSW | | DWn-1 | RBM = receive broadcast mode --------- --------- --------- MSW = mux sataus word 2n-4 | DWn | DW = data word --------- LBW = loop back word 2n+6 | MSW | --------- BROADCAST MESSAGES byte 7 BCtoRTs 8 RTtoRTs 9 MCw/o 10 MCrec ---- --------- --------- --------- --------- 00 | DW1 | | TCW | | LBW | | DW1 | --------- --------- --------- --------- 02 | DW2 | | LBW | | LBW | --------- --------- --------- 04 | DW3 | | MSW | Note: --------- --------- 06 | DW4 | | DW1 | The 1553 interface card deposits 16 --------- --------- bit data into memory in the correct : : : : PC order, lsbs 1st (even byte). --------- --------- 2n-2 | DWn | | DWn-3 | UUT 32 bit data is deposited MSH then --------- --------- LSH, which is PC word backward. The 2n | LBW | | DWn-2 | data reduction routines swap the --------- --------- 2 words for items > 16 bits. 2n+2 | DWn-1 | --------- 2n+4 | DWn | ---------