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SA-1100 Developer’s Manual 11-49
Peripheral Control Module
2BERBus error status.
0 – DMA has not attempted an access to reserved/nonexistent memory space.
1 – DMA has attempted an access to a reserved/nonexistent location in external
memory. The errant DMA read returns zeros.
3ABC
AC bias count status.
0 – AC bias transition counter has not decremented to zero, or API is programmed to all
zeros.
1 – AC bias transition counter has decremented to zero, indicating that the L_BIAS pin
has transitioned the number of times specified by the API control bit field. Counter is
reloaded with the value in API but is disabled until the user clears ABC.
4 IOL
Input FIFO overrun lower panel status.
0 – Input FIFO for the lower panel display has not overrun.
1 – DMA attempted to place data into the input FIFO for the lower panel after it has been
filled.
5IUL
Input FIFO underrun lower panel status.
0 – Input FIFO for the lower panel display has not underrun.
1 – DMA not supplying data to input FIFO for the lower panel at a sufficient rate. FIFO
has completely emptied; pixel unpacking logic has attempted to take added data from
the FIFO.
6 IOU
Input FIFO overrun upper panel status.
0 - Input FIFO for the upper or whole panel display has not overrun.
1 - DMA attempted to place data into the input FIFO for the upper or whole panel after it
has been filled.
7IUU
Input FIFO underrun upper panel status.
0 – Input FIFO for the upper or whole panel display has not underrun.
1 – DMA not supplying data to input FIFO for the upper or whole panel at a sufficient
rate. FIFO has completely emptied; pixel unpacking logic has attempted to take added
data from the FIFO.
8 OOL
Output FIFO overrun lower panel status.
0 – Output FIFO for the lower panel display has not overrun.
1 – Dither logic attempted to place data into the output FIFO for the lower panel after it
had been filled.
9OUL
Output FIFO underrun lower panel status.
0 – Output FIFO for the lower panel display has not underrun.
1 – LCD dither logic not supplying data to output FIFO for the lower panel at a sufficient
rate. FIFO has completely emptied and data pin driver logic has attempted to take
added data from the FIFO.
10 OOU
Output FIFO overrun upper panel status.
0 – Output FIFO for the upper or whole panel display has not overrun.
1 – Dither logic attempted to place data into the output FIFO for the upper or whole
panel after it had been filled.
11 OUU
Output FIFO underrun upper panel status.
0 – Output FIFO for the upper or whole panel display has not underrun.
1 – LCD dither logic not supplying data to output FIFO for the upper or whole panel at a
sufficient rate. FIFO has completely emptied and data pin driver logic has attempted to
take added data from the FIFO.
31..12 — Reserved.
Bit Name Description