PXD20RM Datasheet, PDF (1535/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

TCON_LUTx registers so that the LUT performs different operations (e.g. change the priority order of the
Set/Reset/Toggle enable/Data signals).
The index[3:0] input of the LUT is generated by the logic operation units. Each bit of it is a logic operation
of X, Y, 0 or 1. The logic operations performed are selected by TCON_SMXx.INDEX0-3_SEL (see
Section 46.3.3.7, TCON_SMX0 - TCON_SMX13).
Table 46-23. Default TCON LUT Truth Table
index3
1
0
0
0
0
0
1 _{Don’t care}
index2
x¹
1
0
0
0
0
index1
x
x
1
1
0
0
index0
x
x
x
x
1
0
SMXx(n-1)
x
x
0
1
x
x
SMXx(n)
1
0
1
0
1
0
46.4.2.5 Output Crossbar Mux
The output crossbar mux is used to select 12 from the generated 20 timing signals as the 12 TCON timing
signal outputs. The 20 timing signals include: 6 pulses, 4 toggle generator outputs (vtgl[0:3]), constant “0”
and “1,” and 8 of the 14 SMXs output (SMX6~13). TCON_OMUX_HIGH (see Section 46.3.3.8,
TCON_OMUX_LOW) and TCON_OMUX_LOW (see Section 46.3.3.9, TCON_OMUX_HIGH)
determines which 12 timing signals are selected as the output.
46.4.3 Data inversion control
The data inversion control is adopted to minimize data transition on the data bus, in order to reduce EMI
on board level. The idea is to invert the data output when more than half of the data bits changed compare
to the previous data output, and use a signal (tcon_out[11]) to indicate to the external gray scale reference
circuit that the data is inverted.
The user can enable the data inverse control by setting TCON_CTRL1.data_inv_en to “1” (see
Section 46.3.3.1, Control Register 1 (TCON_CTRL1)), in that case, tcon_out[11] will indicate the data
inversion so it can’t be used as timing signal output. But it can if the data inversion control is disabled.
46.4.4 Bit Mapping Control (BMC)
The Bit Mapping Control (BMC) module is adopted to remap the color component order, color bit order
and output clock position for both RSDS and TTL mode. Figure 46-14 shows the diagram of the bit
mapping control module.
Freescale Semiconductor
PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
46-27