Author:

Jan Pazdera

TSU_ADD component resides on add_on card provides transmition of time stamps (TS) from PTM card for the add on card design. There are three modes the TS can be transmitted by: INIT, SHORT and FAST mode. See below for more information. Pictures not supported anymore.
TSU_ADD Architecture Pictures not supported anymore.
TSU_ADD FSM scheme

TSU_ADD transmition modes description

TSU_ADD can work in 3 modes: INIT, SHORT and FAST:

• INIT mode: TSU_ADD requests TSU_PTM to send the whole TS in sequence of 8 octets (64 bits). When those octets are beeing sent by TS_PTM port, TS_DV signal is set. All PPFTS pulses (see interface) during this phase are counted by TSU_ADD and in the end they are added to the recieved TS. So TS value in TSU_ADD unit should be very close to that one in TSU_PTM.
• SHORT mode: TSU_ADD requests TSU_PTM to send the last octet of TS (7 downto 0). When this octet is beeing set on TS_PTM port, TS_DV signal is set. This mode differs from the FAST mode. The last octet is sent via handshake.
• FAST mode: This mode is set as default, when neither INIT nor SHORT is set. During this mode TSU_PTM is sending the last octet of TS simultanously without acknoledgement. Higher octets of TS are beeing incremented by 1 when PPFTS pulse is noticed. So TS in TSU_ADD unit should be very close to that one in TSU_PTM.