ARM ARM926EJ-S Technical Reference Manual page 115

5.2.2 Instruction TCM signals
5.2.3 Differences between DTCM and ITCM
ARM DDI0198D
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].
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.
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Tightly-Coupled Memory Interface
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