32579B

Video Processor Module - Video Processor Registers - Function 4

Table 7-9. F4BAR0+Memory Offset: Video Processor Configuration Registers (Continued)

Bit

Description

Offset 44h-47h

CRC Signature Register (R/W)

Reset Value: xxxxx100h

Signature values stored in this register can be read by the host. This register is used for test purposes.

31:8

SIG_VALUE (Signature Value). (Read Only) A 24-bit signature value is stored in this bit field and can be read at any time.

 

The signature is produced from the RGB data output of the mixer. This bit field is used for test purpose only.

 

See SIGN_EN (bit 0) description for more information.

 

 

7:3

Reserved.

2SIGN_FREE (Signature Free Run).

0:Disable. (Default) If this bit was previously set to 1, the signature process stops at the end of the current frame (i.e., at the next falling edge of VSYNC).

1:Enable. If SIGN_EN (bit 0) = 1, the signature register captures data continuously across multiple frames.

1Reserved.

0SIGN_EN (Signature Enable).

0:Disable. (Default) The SIG_VALUE (bits [31:8]) is reset to 000001h and held (no capture).

1:Enable. The next falling edge of VSYNC is counted as the start of the frame to be used for CRC checking with each pixel clock beginning with the next VSYNC.

If SIGN_FREE (bit 2) = 1, the signature register captures the pixel data signature continuously across multiple frames.

If SIGN_FREE (bit 2) = 0, a signature is captured for one frame at a time, starting from the next falling VSYNC.

After a signature capture, the SIG_VALUE can be read to determine the CRC check status. SIGN_EN can then be reset to initialize the SIG_VALUE as an essential preparation for the next round of CRC check.

Offset 48h-4Bh

Device and Revision Identification (RO)

Reset Value: 0000xxxxh

 

 

 

31:16

Reserved.

 

 

 

15:8

REV_ID (Revision ID). See the AMD Geode™ SC1200/SC1201 Processor Specification Update document for value.

 

 

7:0

DEV_ID (Device ID). See AMD Geode™ SC1200/SC1201 Processor Specification Update document for value.

 

 

 

 

Offset 4Ch-4Fh

Video De-Interlacing and Alpha Control Register (R/W)

Reset Value: 00060000h

 

 

 

31:22

Reserved.

 

 

 

21:20

ALPHA3_WIN_PRIORITY (Alpha Window 3 Priority). Determines the priority of Alpha Window 3. A higher number indi-

 

cates a higher priority. Priority is used to determine display order for overlapping alpha windows.

 

00: Lowest priority. (Default)

 

 

01: Medium priority.

 

 

10: Highest priority.

 

 

11: Illegal.

 

 

Note:

Priority of enabled alpha windows must be different.

 

 

 

19:18

ALPHA2_WIN_PRIORITY (Alpha Window 2 Priority). Determines the priority of Alpha Window 2. A higher number indi-

 

cates a higher priority. Priority is used to determine display order for overlapping alpha windows.

 

00: Lowest priority. (Default)

 

 

01: Medium priority.

 

 

10: Highest priority.

 

 

11: Illegal.

 

 

Note:

Priority of enabled alpha windows must be different.

 

 

 

17:16

ALPHA1_WIN_PRIORITY (Alpha Window 1 Priority). Determines the priority of Alpha Window 1. A higher number indi-

 

cates a higher priority. Priority is used to determine display order for overlapping alpha windows.

 

00: Lowest priority. (Default)

 

 

01: Medium priority.

 

 

10: Highest priority.

 

 

11: Illegal.

 

 

Note:

Priority of enabled alpha windows must be different.

 

 

 

 

15:14

Reserved.

 

 

 

 

 

344

AMD Geode™ SC1200/SC1201 Processor Data Book

Page 344
Image 344
AMD SC1200 Bit Description Offset 44h-47h CRC Signature Register R/W, Signfree Signature Free Run, Reset Value 0000xxxxh