Intel 80312 I/O Companion Chip - ECEE

Intel ® 80312 I/O Companion ChipClocking, Reset, and InitializationTable 15-5. Internal Bus Reset Summary (Sheet 2 of 2)Unit Preparation for Reset Reset StatusDMA0/1/2CIUAAThe internal bus reset unit notifies the DMAs via a sidebandsignal that a internal bus reset is coming. Upon detecting thissignal, the DMAs:PCI and internal bus Interface:• When the DMAs have already asserted its PCI requestsignal, and not yet started a transaction, the DMAsdeassert the requests.• When the DMAs is in the middle of a transaction, theDMAs complete it normally. This means that thetransaction ends on the PCI bus due to naturalcompletion (BC=0, Queue Full, Queue Empty, GntRemoved and MLT expired, etc.).• When the DMAs is retried from the PCI bus, the DMAsno longer request the PCI bus.• When the DMAs has not yet requested the PCI bus, theDMAs never assert its request for the PCI bus.Upon meeting both the outbound and inbound transactionrequirements, the DMAs assert the sideband signal to thereset unit notifying ready-for-reset.No special requirements. CIU can be reset at any time.No special requirements. AA can be reset at any time.Clear all interrupts and IRQs. AllDMA MMRs reset to the defaultvalue.Clear all interrupts and IRQs. TheCIUbehavesastheIntel ® 80200processor after reset. Meaning, theRST_MODE# reset strapdetermines when the Intel ® 80200processoristobeheldinreset.AllCIU mmrs reset to the defaultvalue.Clear all interrupts and IRQs. AllAA MMRs reset to the defaultvalue.PMONIB-ARBI 2 CMCUNo special requirements. PMON can be reset at any time.No special requirements. IB-ARB can be reset at any time.No special requirements. I2C can be reset at any time.Whenthe I2C is in the middle of a transmission, the protocol maybe violated when the I2C unit resets.No special requirements. MCU can be reset at any time.Clear all interrupts and IRQs. AllPMON MMRs reset to the defaultvalue.Clear all interrupts and IRQs. AllIB-ARB MMRs reset to the defaultvalue.Clear all interrupts and IRQs. AllI2C MMRs reset to the defaultvalue.Clear all interrupts and IRQs. AllMCU MMRs reset to the defaultvalue.Sec-ARB Not affected by IB Reset. Not affected by IB Reset.PrimaryPCISelectorNot affected by IB Reset.Not affected by IB Reset.Bridge Not affected by IB Reset. Not affected by IB Reset.15-12 Developer’s Manual