UPD77016 Datasheet, PDF (37/56 Pages) NEC – 16 bits, Fixed-point Digital Signal Processor

Bus Arbitration Timing (Bus idle)
CLKOUT
BSTB
HOLDRQ
HOLDAK
X/Y, DA0 - DA15,
MRD, MWR
(Bus busy)
Bus idle
thBS
tdBS
Bus release
tsuHRQ
tdHAK
thHRQ
th(BS-D)
Bus idle
(Bus busy)
tsuHRQ
Hi-Z
thHAK
thHRQ
tv(BS-D)