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MPC850 Integrated Communications Microprocessor Users Manual
MOTOROLA
CONTENTS
Paragraph
Number
Title
Page
Number
19.2.7.2.2
19.2.8
19.2.8.1
19.2.8.2
19.2.9
19.2.9.1
19.2.9.2
19.2.9.3
19.2.9.4
19.2.10
19.2.11
Edge-Sensitive Requests......................................................................19-15
IDMA TransfersDual-Address and Single-Address.................................19-15
Dual-Address (Dual-Cycle) Transfer.......................................................19-15
Single-Address (Single-Cycle) Transfer (Fly-By)...................................19-16
Single-Buffer Mode on IDMA1A Special Case.......................................19-18
IDMA1 Channel Mode Register (DCMR) (Single-Buffer Mode)...........19-19
IDMA1 Status Register (IDSR1) (Single-Buffer Mode) .........................19-20
IDMA1 Mask Register (IDMR1) (Single-Buffer Mode).........................19-20
Burst Timing (Single-Buffer Mode).........................................................19-20
External Recognition of an IDMA Transfer.................................................19-21
Interrupts During an IDMA Bus Transfer....................................................19-22
Chapter 20
Serial Interface
20.1
20.2
20.2.1
20.2.2
20.2.3
20.2.3.1
20.2.3.2
20.2.3.3
20.2.3.4
20.2.3.5
20.2.3.6
20.2.4
20.2.4.1
20.2.4.2
20.2.4.3
20.2.4.4
20.2.4.5
20.2.4.6
20.2.5
20.2.5.1
20.2.5.2
20.2.6
20.2.6.1
20.2.6.2
20.2.6.2.1
20.2.6.2.2
20.2.6.3
SI Features..........................................................................................................20-3
The Time-Slot Assigner (TSA)..........................................................................20-3
TSA Signals....................................................................................................20-7
Enabling Connections to the TSA..................................................................20-7
SI RAM ..........................................................................................................20-8
Disabling and Reenabling the TSA............................................................20-8
TDMa Channel with Static Frames............................................................20-8
SI RAM Dynamic Changes........................................................................20-8
TDMa Channel with Dynamic Frames ....................................................20-10
Programming the SI RAM .......................................................................20-11
SI RAM Programming Example..............................................................20-13
The SI Registers ...........................................................................................20-14
SI Global Mode Register (SIGMR)..........................................................20-14
SI Mode Register (SIMODE)...................................................................20-15
SI Clock Route Register (SICR) ..............................................................20-20
SI Command Register (SICMR) ..............................................................20-22
SI Status Register (SISTR).......................................................................20-22
SI RAM Pointer Register (SIRP) .............................................................20-23
IDL Bus Implementation..............................................................................20-24
ISDN Terminal Adaptor Application.......................................................20-25
Programming the IDL Interface...............................................................20-28
GCI Bus Implementation..............................................................................20-29
GCI Activation/Deactivation....................................................................20-31
Programming the GCI Interface...............................................................20-31
Normal Mode .......................................................................................20-31
SCIT Mode...........................................................................................20-31
GCI Interface (SCIT Mode) Programming Example...............................20-32