Video Processor Module

 

 

 

 

32579B

 

 

 

 

 

 

7.2.1

Video Input Port (VIP)

 

 

 

data processed by the CCIR-656 decoder. For Direct

The VIP block is designed to interface the SC1200/SC1201

Video/VBI modes, there are two FIFOs that buffer the

CCIR-656 decoder’s data. A 2048-byte FIFO buffers Video

processor

with

external video

processors

(e.g., Philips

data and a 128-byte FIFO buffers VBI data. The FIFOs are

PNX1300

or Sigma Designs

EM8400) or

external TV

also used to provide clock domain changes. The VIP inter-

decoders

(e.g.,

Philips SAA7114). It inputs CCIR-656

face clock (nominally 27 MHz) is the input clock domain for

Video and

raw

VBI data sourced

by

those devices,

all three FIFOs. For the Capture Video/VBI FIFO, the data

decodes the

data, and delivers the

data

directly to the

is clocked out using the FPCI clock (33 or 66 MHz). For the

Video Formatter (Direct Video/VBI modes) or to the GX1

Direct Video FIFO, the Video data is clocked out using the

module’s Video Frame Buffer (Capture Video/VBI modes).

GX1’s Video port clock (75, 116, or 133 MHz GX1 core

Figure 7-4shows a diagram of the VIP block.

 

 

clock divided by 2 or 4) and for the Direct VBI FIFO the

From the VIP block’s perspective, Direct Video/VBI modes

data is clocked out with the GX1’s pixel port clock (approxi-

are always on. There are no registers that enable/disable

mately 27 MHz only because VBI out is only supported for

Direct Video/VBI modes. The data source selected at the

TVs).

video mux (F4BAR0+Memory Offset 400h[1:0]) and VBI

Since the VIP block treats Video data and VBI data inde-

mux (F4BAR0+Memory Offset 400h[2]) determine if the

pendently, this means that they can operate in Capture

data from the VIP interface is moved directly or must be

Video/VBI or Direct Video/VBI modes independent of each

captured.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

other, with some restrictions. Table 7-1 on page 316 shows

Three FIFOs in the VIP block support the efficient move-

the supported Direct/Capture configurations.

ment of

Video

and VBI data. For

Capture Video/VBI

 

modes, a 128-byte FIFO buffers both Video and raw VBI

 

CRT_VSYNC

 

Stop DCLK

 

 

 

VIP_VSYNC

GenLock

 

 

 

 

 

 

 

Control

 

 

 

 

 

 

 

 

 

 

 

Fast

 

 

 

 

Capture Video/VBI

X-Bus

Fast-PCI

 

 

Controller and

to

 

GX1

 

 

Bus Master

Fast-PCI

 

Module

 

 

 

Bridge

 

 

 

 

 

Fast-PCI Clock

 

 

 

 

Capture Video/VBI

Video or VBI Data

VIP

 

FIFO

Capture Video/VBI Data

 

 

 

 

 

 

 

 

 

 

 

Data

CCIR-656

 

GX1 Video Clock

 

to Video

 

Decoder

Direct Video

Direct Video Data

Video

Formatter

 

 

FIFO

Mux

 

 

 

 

 

VIP

 

 

TV Clock

 

to TVOUT

 

Direct VBI

Direct VBI Data

VBI

Clock

 

FIFO

Mux

 

 

 

 

 

 

F4BAR2

Direct Video/VBI

VIP

 

 

 

Control

 

 

 

Registers

Controller

 

 

 

Figure 7-4. VIP Block Diagram

AMD Geode™ SC1200/SC1201 Processor Data Book

315

Page 315
Image 315
AMD SC1201, SC1200 manual Video Input Port VIP