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ARM9TDMI Coprocessor Interface
4-8
If a coprocessor is not attached to the ARM9TDMI, the handshake signals must be
driven with "10" ABSENT, otherwise the ARM9TDMI processor will hang if a
coprocessor enters the pipeline.
If multiple coprocessors are to be attached to the interface, the handshaking signals can
be combined by ANDing bit 1, and ORing bit 0. In the case of two coprocessors which
have handshaking signals CHSD1, CHSE1 and CHSD2, CHSE2 respectively:
CHSD[1]<= CHSD1[1] AND CHSD2[1]
CHSD[0]<= CHSD1[0] OR CHSD2[0]
CHSE[1]<= CHSE1[1] AND CHSE2[1]
CHSE[0]<= CHSE1[0] OR CHSE2[0]
Copyright © 1998, 1999 ARM Limited. All rights reserved.
ARM DDI0145B
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