MB87P2020 Datasheet, PDF (184/356 Pages) Fujitsu Component Limited. – Colour LCD/CRT/TV Controller

MB87J2120, MB87P2020-A Hardware Manual
3.14 GPU Signal to GDC Pin Assignment
3.14.1 Multi-Purpose Digital Signals
Some GDC pins are shared by GPU signals, since pins are a limited package resource. This sharing depends
on the physical display connected to GDC. Table 3-14 shows the assignments.
Table 3-14: GPU multi-purpose digital signal to GDC pin assignment. Pixel data designates actual colors
or gray scales as well as the blanking clamp value.
GDC pin
GPU signal usage
a) Display with scan mode SglScan
DIS_D[23:19] Digital pixel data [23:19] when bit stream format is either S24, or AN and twin dis-
play mode active (digital display is secondary), otherwise delay adjusted outputs of
Sync Mixer 7…3
DIS_D[18:0] Digital pixel data
b) Display with scan mode DualScan
DIS_D[23:19] Delay adjusted outputs of Sync Mixer 7…3
DIS_D[18:16] Constant zero
DIS_D[15:8] Lower display segment digital pixel data
DIS_D[7:0] Upper display segment digital pixel data
c) Display with scan mode ZzagScan
DIS_D[23:19] Delay adjusted outputs of Sync Mixer 7…3
DIS_D[18:8] Constant zero
DIS_D[7:0] Digital pixel data
Note 1: For cases with DIS_D[23:19] being not connected to the delay adjusted outputs of Sync Mixers
3 to 7 these signals are not available at GDC pins.
Note 2: Independent of the GPU signals being connected to the pins their output is further controlled by
the respective output enable settings.
DIS_PIXCLK When used as output the pin carries the pixel clock as formed due to gating and
divider settings (cf. 3.11)
3.14.2 Analog Pixel Data
If scan mode is set to SglScan and bit stream format is AN (analog display is primary) or twin display
mode (Jasmine only) is active and bit stream format is S9…S24 (analog display is secondary), pins A_RED,
A_GREEN, and A_BLUE carry analog pixel data, i.e. colors or gray scales as well as the blanking clamp
value, otherwise they are high-Z. They are high-Z as well when the DAC output enable bit is reset.
3.14.3 Dedicated Sync Signals
Three pins for dedicated sync signals are available. Table 3-15 gives the assignment.
Table 3-15: GPU sync signal to GDC pin assignment.
GDC pin
GPU signal usage
DIS_HSYNC This pin is always connected to the delay adjusted output of Sync Mixer 0.
Page 184