Network Router User Manual

TMS380C26 NETWORK COMMPROCESSOR SPWS010A–APRIL 1992–REVISED MARCH 1993
88
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
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PARAMETER MEASUREMENT INFORMATION
UserBus ExchangeSIF Master
T1I2I1T4T3T2
SOWN
SDDIR
SADH0–SADH7,
SADL0–SADL7,
SPH, SPL
SRNW
SAS
, SUDS,
SLDS
SBRQ
(see Note A)
SIF Outputs:
SDTACK
SBGR
SBCLK
SIF Inputs:
230
220
224b
240
220
224d
HI-Z
HI-Z
READ
WRITE
SIF
WRITE
READ
240
223b
NOTE A: In 80x8x mode, the system interface deasserts SHRQ on the rising edge of SBCLK following the T4 state of the last system bus transfer it controls. In 68xxx mode, the system
interface deasserts SBRQ
on the rising edge of SBCLK in state T2 of the first system bus transfer it controls.
Figure 43. 68xxx Mode Bus Arbitration Timing, SIF Returns Control