MOTOROLA
Illustrations
xxxv
ILLUSTRATIONS
Figure
Number
Title
Page
Number
9-3
System Clock Control Register (SCCR).................................................................... 9-8
9-4
System Clock Mode Register (SCMR)...................................................................... 9-9
9-5
Relationships of SCMR Parameters ........................................................................ 9-10
10-1
Dual-Bus Architecture ............................................................................................. 10-3
10-2
Memory Controller Machine Selection ................................................................... 10-6
10-3
Simple System Configuration.................................................................................. 10-7
10-4
Basic Memory Controller Operation ....................................................................... 10-8
10-5
Partial Data Valid for 32-Bit Port Size Memory, Double-Word Transfer ............ 10-13
10-6
Base Registers (BRx) ............................................................................................ 10-14
10-7
Option Registers (ORx)ÑSDRAM Mode ............................................................ 10-16
10-8
ORx ÑGPCM Mode ............................................................................................. 10-18
10-9
ORxÑUPM Mode................................................................................................. 10-20
10-10
60x/Local SDRAM Mode Register (PSDMR/LSDMR) ....................................... 10-21
10-11
Machine x Mode Registers (MxMR)..................................................................... 10-26
10-12
Memory Data Register (MDR) .............................................................................. 10-29
10-13
Memory Address Register (MAR) ........................................................................ 10-29
10-14
60x Bus-Assigned UPM Refresh Timer (PURT) .................................................. 10-30
10-15
Local Bus-Assigned UPM Refresh Timer (LURT)............................................... 10-30
10-16
60x Bus-Assigned SDRAM Refresh Timer (PSRT) ............................................. 10-31
10-17
Local Bus-Assigned SDRAM Refresh Timer (LSRT) .......................................... 10-32
10-18
Memory Refresh Timer Prescaler Register (MPTPR)........................................... 10-32
10-19
128-Mbyte SDRAM (Eight-Bank Configuration, Banks 1 and 8 Shown) ............ 10-34
10-20
PRETOACT = 2 (2 Clock Cycles) ........................................................................ 10-39
10-21
ACTTORW = 2 (2 Clock Cycles) ......................................................................... 10-39
10-22
CL = 2 (2 Clock Cycles)........................................................................................ 10-40
10-23
LDOTOPRE = 2 (-2 Clock Cycles)....................................................................... 10-40
10-24
WRC = 2 (2 Clock Cycles).................................................................................... 10-41
10-25
RFRC = 4 (6 Clock Cycles)................................................................................... 10-41
10-26
EAMUX = 1 .......................................................................................................... 10-42
10-27
BUFCMD = 1 ........................................................................................................ 10-42
10-28
SDRAM Single-Beat Read, Page Closed, CL = 3................................................. 10-43
10-29
SDRAM Single-Beat Read, Page Hit, CL = 3....................................................... 10-43
10-30
SDRAM Two-Beat Burst Read, Page Closed, CL = 3 .......................................... 10-43
10-31
SDRAM Four-Beat Burst Read, Page Miss, CL = 3 ............................................. 10-44
10-32
SDRAM Single-Beat Write, Page Hit ................................................................... 10-44
10-33
SDRAM Three-Beat Burst Write, Page Closed .................................................... 10-44
10-34
SDRAM Read-after-Read Pipeline, Page Hit, CL = 3 .......................................... 10-45
10-35
SDRAM Write-after-Write Pipelined, Page Hit .................................................... 10-45
10-36
SDRAM Read-after-Write Pipelined, Page Hit..................................................... 10-45
10-37
SDRAM Mode-Set Command Timing .................................................................. 10-46
10-38
Mode Data Bit Settings.......................................................................................... 10-47
10-39
SDRAM Bank-Staggered CBR Refresh Timing ................................................... 10-48
10-40
GPCM-to-SRAM ConÞguration............................................................................ 10-52