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8019AS.doc
2001-05-10
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SPECIFICATION
RTL8019AS
38
Item byte
1CH
Compatible ID0-3
41H, D0H, 80H, D6H
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.
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