Tightly-Coupled Memory Interface
ARM DDI0198D
Copyright © 2001-2003 ARM Limited. All rights reserved.
5-7
5.2.2
Instruction TCM signals
The instruction side TCM signals are almost identical to the DTCM signals. All the
signals on the DTCM have an equivalent on the instruction side.
•
Control signals
—
IRCS
—
IRWAIT
—
IRIDLE
•
Address and attribute signals
—
IRSEQ
—
IRADDR[17:0]
—
IRWBL[3:0]
—
IRnRW
•
Data signals
—
IRRD[31:0]
—
IRWD[31:0]
•
DMA signals
—
IRDMAEN
—
IRDMACS
—
IRDMAADDR[17:0]
.
5.2.3
Differences between DTCM and ITCM
There are three differences between the DTCM and ITCM interfaces:
•
DMA to ITCM should not occur be performed unless
IRIDLE
is asserted
•
Only back-to-back transfers on the DTCM can be marked as sequential. On the
ITCM idle cycles may occur before requests marked as sequential.
•
Sequential write transfers will not occur on the ITCM.
Содержание ARM926EJ-S
Страница 6: ...Contents vi Copyright 2001 2003 ARM Limited All rights reserved ARM DDI0198D ...
Страница 10: ...List of Tables x Copyright 2001 2003 ARM Limited All rights reserved ARM DDI0198D ...
Страница 14: ...List of Figures xiv Copyright 2001 2003 ARM Limited All rights reserved ARM DDI0198D ...
Страница 22: ...Preface xxii Copyright 2001 2003 ARM Limited All rights reserved ARM DDI0198D ...
Страница 28: ...Introduction 1 6 Copyright 2001 2003 ARM Limited All rights reserved ARM DDI0198D ...
Страница 96: ...Memory Management Unit 3 32 Copyright 2001 2003 ARM Limited All rights reserved ARM DDI0198D ...
Страница 108: ...Caches and Write Buffer 4 12 Copyright 2001 2003 ARM Limited All rights reserved ARM DDI0198D ...
Страница 152: ...Bus Interface Unit 6 12 Copyright 2001 2003 ARM Limited All rights reserved ARM DDI0198D ...
Страница 156: ...Noncachable Instruction Fetches 7 4 Copyright 2001 2003 ARM Limited All rights reserved ARM DDI0198D ...
Страница 176: ...Instruction Memory Barrier 9 6 Copyright 2001 2003 ARM Limited All rights reserved ARM DDI0198D ...
Страница 180: ...Embedded Trace Macrocell Support 10 4 Copyright 2001 2003 ARM Limited All rights reserved ARM DDI0198D ...
Страница 206: ...Signal Descriptions A 18 Copyright 2001 2003 ARM Limited All rights reserved ARM DDI0198D ...
Страница 224: ...CP15 Test and Debug Registers B 18 Copyright 2001 2003 ARM Limited All rights reserved ARM DDI0198D ...