Integration
13.2.2 LCD Controller Clock and Reset Management
The LCDC module uses the following functional and OCP interface clocks. The L4 Slave interface runs at
half the frequency of the L3 Master interface but uses the same clock. The clock is divided within the
LCDC through the l4_clkdiv input using the pd_per_lcd_l4s_gclk_ien signal from the PRCM. The
functional clock comes from the Display PLL. When the Display PLL is in bypass mode, its output is
sourced by either CORE_CLKOUTM6 or PER_CLKOUTM2.
Table 13-2. LCD Controller Clock Signals
Clock Signal
Max Freq
Reference / Source
Comments
l3_clk
200 MHz
CORE_CLKOUTM4
pd_per_lcd_l3_gclk
Master Interface Clock
From PRCM
l4_clk
100 MHz
CORE_CLKOUTM4
pd_per_lcd_l3_gclk
Slave Interface Clock
(divided within LCDC)
From PRCM
lcd_clk
200 MHz
Display PLL CLKOUT
pd_per_lcd_gclk
Functional Clock
From PRCM
13.2.3 LCD Controller Pin List
The LCD Controller external interface signals are shown in
Table 13-3. LCD Controller Pin List
Pin
Type
Description
lcd_cp
O
Pixel Clock in Raster model Read Strobe
or Read/Write Strobe in LIDD mode
lcd_pixel_i[15:0]
I
LCD Data Bus input (for LIDD mode only)
lcd_pixel_o[23:0]
O
LCD Data Bus output
lcd_lp
O
Line Clock or HSYNC in Raster mode;
Write Strobe or Direction bit in LIDD mode
lcd_fp
O
Frame Clock or VSYNC in Raster mode;
Address Latch Enable in LIDD mode
lcd_ac
O
AC bias or Latch Enable in Raster mode;
Primary Chip Select/Primary Enable in
LIDD MPU/Hitachi mode
lcd_mclk
O
N/A in Raster mode; Memory
Clock/Secondary chip Select/Secondary
Enable in LIDD Synchronous/Async
MPU/Hitachi mode
1101
SPRUH73H – October 2011 – Revised April 2013
LCD Controller
Copyright © 2011–2013, Texas Instruments Incorporated