Peripheral Control Module

Bit

Name

Description

 

 

 

7

PAS

Passive/active display select.

 

 

0 – Passive or STN display operation enabled. Dither logic is enabled.

 

 

1 – Active or TFT display operation enable. Dither logic bypassed, pin timing changes to

 

 

support continuous pixel clock, output enable, VSYNC, HSYNC signals.

 

 

 

8

BLE

Big/little endian select.

 

 

0 – Little endian operation is selected, half-word palette buffer data is packed into

 

 

individual words of memory starting with the least significant half-word, and frame buffer

 

 

pixel data is packed into individual words of memory starting with the least significant

 

 

nibble, byte, or half-word.

 

 

1 – Big endian operation is selected, half-word palette buffer data is packed into

 

 

individual words of memory starting with the most significant half-word, and frame buffer

 

 

pixel data is packed into individual words of memory starting with the most significant

 

 

nibble, byte, or half-word.

 

 

 

9

DPD

Double-pixel data pin mode.

 

 

0 – In single-panel monochrome operation, four pixels are presented to LDD<3:0> each

 

 

pixel clock.

 

 

1 – In single-panel monochrome operation, eight pixels are presented to LDD<7:0>

 

 

each pixel clock.

 

 

Note: This bit is ignored in all other modes of operation except for single-panel

 

 

monochrome.

 

 

 

11..10

Reserved.

 

 

 

19..12

PDD

Palette DMA request delay.

 

 

Value (from 0 to 255) used to specify the number of memory controller clocks (half the

 

 

speed of the CPU clock). The on-chip palette DMA request should be disabled after

 

 

each DMA transfer to the palette. The clock count starts after the last write of each burst

 

 

cycle. While the counter is decrementing, all DMA requests from the palette are masked.

 

 

When the counter reaches zero, any pending or subsequent DMA requests are allowed

 

 

to generate a 4-word burst. Programming PDD=8h’00 disables this function.

 

 

 

31..20

Reserved.

 

 

 

SA-1100 Developer’s Manual

11-33

Page 183
Image 183
Intel SA-1100 manual Pas, Ble, Dpd, Pdd