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D–24 PALcode Restrictions and Guidelines
21264/EV68A Hardware Reference Manual
Restriction 48: MB Bracketing of Dcache Writes to Force Bad Data ECC and Force
D.44 Restriction 48: MB Bracketing of Dcache Writes to Force Bad
Data ECC and Force Bad Tag Parity
Writes to DC_CTL[F_BAD_DECC] and DC_CTL[DCDAT_ERR_EN] must be brack-
eted by MB instructions to quiesce the memory system. The Istream must also be qui-
esced before and during the sequence, as described in Section D.26.