Cypress CY62158EV30 Manual do Utilizador descarregar pdf (Página 56)

56 September 5, 2010

System Control Register

The System Control register provides access to configuration bits for the video capture and

display system. It is implemented as a read-modify-write register and includes LCD and capture

modes.

Bit Name Description

VCEN Video capture DMA enable. Enables video capture to memory. Disabling this bit

captures the remainder of the current frame, and then stops.

LVDEN LCD Video DMA enable. Enables DMA from the video memory region to the LCD.

LGDEN LCD Graphics DMA enable. Enables DMA from the graphics memory region to

the LCD.

CMKEN Chroma key enable.

VSCALE Video scale control. Scales the video during output to the LCD. If set, the LCD

DMA engine skips every other pixel and every other row during LCD video DMA

output (Graphics DMA is not affected). As a result, the video object displays at ¼

its normal size.

MPRI Memory port row increment. If set to 0, any read or write to the memory port auto

increments the MPC register at the end of the transfer by 1. If MPC is at the last

column (MPNR-1), then it sets to 0 and the MPR increments by 1. If the end of the

row is reached, then it increments by columns. If set to 1, any read or write

increments by rows.

VCQVGA Video Capture is QVGA/VGA. If set to 0, the video capture controller assumes

that the camera is configured for VGA capture. If set to 1, it assumes that the

camera is configured for QVGA. This only affects video capture; the camera’s I

and LCD settings must be reconfigured manually.

VCTEST Video Capture Test. When set to 1, the incoming pixel stream is ignored and

replaced with a test pattern.

PCBrA PCB is Revision A. An early internal revision of the PCB had a different pin

configuration for the camera data port. Setting this bit to 1 provides backwards

compatibility.

Table F-3. System Control Register

SYSCTRL: 0xA000.0002

15 14 13 12 11 10 9 8

0000000PCBrA

R R R R R R R R/W

76543210

VCTES

VCQV

MPRI

VSCAL

CMKE

LGDEN LVDEN VCEN

R/W R/W R/W R/W R/W R/W R/W R/W

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 80 81

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