3.8. VME Dataway Display
Fig. 40: Dataway Display layout
The V2718 is provided with a 88 LED Dataway Display; such LEDs report the VME Bus
status (address, data and control lines) related to the latest cycle.
ADDR[31:0], AM[5:0], IACK, WRITE and LWORD: These LEDs are frozen on the AS
leading edge and remain stable until the next cycle.
DATA[31:0]: These LEDs are frozen either on the DS leading edge during the write
cycles, or on the DTACK (or BERR) leading edge during the read cycles. The datum
remains stable until the next cycle. In case of BLT cycles, the last read datum remains
visible.
DS0 and DS1: These LEDs turn on as the signal is active during the cycle just executed;
they remain stable until the next cycle.
AS: This LED flashes on the AS leading edge; it is used for signalling a cycle execution.
BGR: This LED flashes as any Bus Grant line (BG[3:0]) is active.
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