TI380C30 Datasheet, PDF (54/78 Pages) Texas Instruments – INTEGRATED TOKEN-RING COMMPROCESSOR AND PHYSICAL-LAYER INTERFACE

SIF Inputs:
SBCLK
SBBSY,
SHLDA
SIF Outputs:
SHRQ
User Master
( T4)
230
Bus Exchange
I1
I2
208a
208b
SIF Master
TX
T1
241
SRD, SWR
SBHE
241a
212
SADH0 – SADH7,
SADL0 – SADL7,
SPH, SPL
SDDIR
SOWN ^†
224c
224a
212
Address Valid
Write
Read
† _{While the system interface DMA controls are active (i.e., SOWN is asserted), the SCS input is disabled.}
Figure 23. 80x8x-Mode Bus-Arbitration Timing, SIF Takes Control