Slaves operating in Multiblock Mode use both Daisy-Chains (DA, DB) to exchange control signals Transfer Strobe (TS) and Transfer Acknowledge (TK). Possession of the token, TS, causes a Multiblock Slave become active and participate in ensuing data transfers.
Multiblock Capable Slaves shall terminate DRA and DLB in 50 to -2.0V, or equivalent, and drive DLA and DRB with ECL levels according to the the FASTBUS Specification Section A.1.1. Multiblock configured Slaves shall use the Daisy-Chain signals for token transfer as shown in Table 32. An inactive Primary Link shall assert TSO=0 and TKO=0. An inactive Middle Link shall assert TSO=0 and TKO=TKI. An inactive End Link shall assert TSO=0 and TKO=1. When not configured as a member of a Multiblock Group Multiblock Capable Slaves shall pass DRA to DLA and DLB to DRB.
During a Multiblock Operation TSO=1 is asserted by an empty Multiblock Primary or Middle Link to indicate to the next Multiblock Slave that it should prepare to respond to data transfer operations on the segment. When the Multiblock Slave that has received TSI=1 is ready to continue data transfer operations it acknowledges by asserting TKO=0.
A Multiblock configured End Link always produces TKO=1 when inactive and Middle Links assert TKO=TKI when inactive. Thus when the Multiblock Group is correctly configured and inactive the Primary Link should receive TKI=1.