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TMDS570LS31HDK: VIM RAM parity fault means ISR in FBPARERR is continually re-entered.

Part Number: TMDS570LS31HDK

The VIM RAM is initialised with parity and both the ISR and the parity parts are set up ok.

When FBPARERR is given an ISR address and a parity error created in VIM RAM parity 0xFFF82400 , the ISR is continually re-entered despite it rewriting VIM RAM with parity enabled and clearing the PARFLG.

On re-entry the PARFLG is clear.

Parity is enabled throughout. The esm High Level Interrupt is not entered.