MC68322 데이터 시트보기 (PDF) - Motorola => Freescale

부품명

상세내역

제조사

MC68322

Integrated Printer Processor

Motorola => Freescale 

Freescale Semiconductor, Inc.

render a page or band image. When the end of the display list is reached, the RGP generates an interrupt

and waits for another display list address. The RSR is double buffered so a second display list address can

be loaded while the RGP is working on the first display list. Upon completion of the first display list, an

interrupt is generated and the second display list begins executing immediately.

The RGP can render an entire page from a display list or multiple bands from a single banded display list. A

banded display list contains band information near the beginning of the display list. This band information

includes the address and size of the band as well as the band number that is to be processed. The RGP

uses this information to determine which orders from the display list to process and where in memory to

create the bit map image for this specific band. The write back logic of the RGP automatically updates any

graphic orders that cross band boundaries in order to prepare them for execution during rendering of the

following band. This is done without any intervention from software running on the EC000 Core. After one

band is fully rendered and the RGP generates an interrupt, software simply adjusts the display list to reflect

the next band information and then restarts the RGP.

PRINT ENGINE VIDEO CONTROLLER (PVC)

The PVC is started by loading a set of registers, known as the printer control block (PCB) with the

dimensions and location of the print image. When the last register is loaded, the PVC fetches the first page

band image data from memory and waits for the print engine to signal start-of-page via frame synchronize

(FSYNC). When FSYNC is detected, the PVC generates a band begin interrupt and transmits the page

image video data to the print engine. When the entire page band image is transmitted, a page end interrupt

is generated allowing software to reclaim the image memory space.

The MC68322 contains a generic non-impact printer video interface, suitable for virtually all printers currently

on the market. The video interface supports most laser printer and various inkjet interfaces. The PVC moves

rasterized data from DRAM to the video port automatically. A digital phase locked loop is provided for those

printers that do not supply a video clock source. The generic video interface consists of the I/O signals

defined in Table 4.

Signal

PRINT

FSYNC

LSYNC

VIDEO

VCLK

Table 4. MC68322 PVC I/O Signals

I/O

Description

O Print Request requests a page to be printed.

I Frame Sync indicates the top of the page in response to a print request.

I Line Sync indicates the left edge of the page.

O Video is the digital serial video image.

I Video Clock is used to shift the video image (either from the printer, or an 8x

clock used for the digital phase locked loop).

PRINTER COMMUNICATION INTERFACE

The MC68322 provides signals for printer communications interfacing to 8-bit synchronous full duplex

interface printers. Interrupts, if enabled, indicate when a serial command has been sent or a serial status

has been received. For synchronous operation, the signals are defined in Table 5.

8

MC68322 PRODUCT INFORMATION

MOTOROLA

For More Information On This Product,

Go to: www.freescale.com

Share Link: