RTL8019AS datasheet(38/51 Pages) REALTEK

38 / 51 page

RTL8019AS

Datasheet

2005-08-26

TAG

I/O Format

Length: fixed

8 bytes

Item byte

47H

I/O information

00H

Min. I/O base bits 7-0

20H

Min. I/O base bits 15-8

02H

Max. I/O base bits 7-0

80H

Max. I/O base bits 15-8

03H

Base alignment

20H

Range length

20H

TAG

IRQ Format

Length: fixed

4 bytes

Item byte

23H

IRQ mask bits 7-0

38H

IRQ mask bits 15-8

9EH

IRQ information

01H

TAG

Memory Format (optional)

Length: fixed

12 bytes

Item byte

81H

This example uses 16k-byte BROM.

Length bits 7-0

09H

Length bits 15-8

00H

Memory information

40H

Min. base bits 15-8

00H

Min. base bits 23-16

0CH

Max. base bits 15-8

C0H

Max. base bits 23-16

0DH

Base alignment bits 7-0

00H

Base alignment bits 15-8 40H

Range length bits 15-8

40H

Range length bits 23-16

00H

TAG

END Tag

Length: fixed

2 bytes

Item byte

79H

Checksum

2's complement of the sum of all the above resource data

i.e. 2's complement of (0AH+10H+10H+.......+79H)

6.4. Boot ROM

Whether a EPROM or flash memory is used as the BROM, RTL8019AS's BROM read operation is still the

same as RTL8019's. The supported BROM size is the same, too.

The write operation of a flash memory is much like the read except that a SMEMWB command is issued

instead of SMEMRB. The block diagram below shows the application when an 128k*8bit flash memory

(e.g. 29F010) is used as the BROM.

RTL8019AS Datasheet(PDF) 38 Page - Realtek Semiconductor Corp.

RTL8019AS Datasheet(HTML) 38 Page - Realtek Semiconductor Corp.

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