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7-40 Intel® PXA255 Processor Developer’s Manual
LCD Controller
Table 7-12. LCSR Bit Definitions (Sheet 1 of 2)
Physical Address
0x4400_0038
LCD Controller Status Register 1 LCD Controller
Bit
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
reserved
SINT
BS
EOF
QD
OU
IUU
IUL
ABC
BER
SOF
LDD
Reset X X X X X X X X X X X X X X X X X X X X X 0 0 0 0 0 0 0 0 0 0 0
Bits Name Description
31:11 — reserved
10 SINT
Subsequent Interrupt status, maskable interrupt:
0 = A second unmasked branch, start of frame, end of frame, or bus error interrupt has
NOT occurred before a previous interrupt has completed.
1 = A second unmasked branch, start of frame, end of frame, or bus error interrupt has
occurred before the previous interrupt has been cleared. The value in the Interrupt
Frame ID Register is not replaced with the value from the second interrupt.
9BS
Branch Status, maskable interrupt:
0 = The DMA has not loaded a branched-to descriptor, or the DMA has loaded a
branched-to descriptor, but the branch interrupt (BINT) bit is not set in the Frame
Branch Register.
1 = The DMA has loaded a branched-to descriptor, and the BINT bit is set.
8EOF
End Of Frame status, maskable interrupt:
0 = A new frame with the EOFINT bit set in its descriptor has not been processed.
1 = The DMA has finished fetching a frame with the EOFINT bit set in its descriptor.
7QD
LCD Quick Disable status, maskable interrupt:
0 = LCD has not been quickly disabled by clearing LCCCR0[ENB].
1 = LCD has been quickly disabled.
6OU
Output FIFO Underrun status, maskable interrupt:
0 = Output FIFOs have not underrun.
1 = LCD dither logic is not supplying data to output FIFOs for the panel at a sufficient rate.
The output FIFOs have completely emptied.
5IUU
Input FIFO Underrun Upper panel status, maskable interrupt:
0 = The input FIFO for the upper (dual-panel mode) or whole panel (single-panel mode)
display has not underrun.
1 = DMA is not supplying data to the input FIFO for the upper or whole panel at a sufficient
rate. The FIFO has completely emptied, and the pixel unpacking logic has attempted
to take data from the FIFO.
4IUL
Input FIFO Underrun Lower panel status, dual-panel mode only, maskable interrupt:
0 = The input FIFO for the lower panel display has not underrun.
1 = DMA is not supplying data to the input FIFO for the lower panel at a sufficient rate. The
FIFO has completely emptied, and the pixel unpacking logic has attempted to take
data from the FIFO.
3 ABC
AC Bias Count status, nonmaskable interrupt:
0 = The AC bias transition counter has not decremented to zero.
1 = The AC bias transition counter has decremented to zero, indicating that the L_BIAS
pin has toggled the number of times specified by the LCCR3[API] control-bit field. The
counter is reloaded with the value in API but is disabled until the user clears ABC.