User`s manual
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ISA_MEM2.SCH
Am486 MICROPROCESSOR
PCI CUSTOMER DEVELOPMENT PLATFORM
1MByte ISA Flash Memory
Configured as 512Kx16bit (29F800T device in "word" mode)
Access at even ISA Memory addresses between 15MB and 16MB-1
Use CSR 12h bit 3 to access 0f00000-0ffffffh as ISA Memory (instead of DRAM, if installed)
Flash chip A0 pin tied to ISA Address Bit 1; mulitply desired
Flash chip address by 2h to find correct ISA address for access
(ex: Flash chip address 555h is accessed at ISA address AAAh)
ISA BUS FLASH MEMORY
2.1
(C) Advanced Micro Devices, Inc. (800) 222-9323
5204 E. Ben White Blvd.
Austin, TX 78741
AMD Proprietary/All Rights Reserved
23 26
Friday, December 04, 1998
Title
Size Document Number Rev
Date: Sheet of
RSTDRV#
WORD
ISAA17
ISAA15
ISAA8
ISAA4
ISAA14
ISAA9
ISAA13
ISAA11
ISAA18
ISAA12
ISAA6
ISAA7
ISAA2
ISAA19
ISAA3
ISAA5
ISAA1
ISAA16
ISAA10
ROMCE#
ROMOE#
ROMWE#
ISAD1
ISAD0
ISAD7
ISAD6
ISAD2
ISAD3
ISAD4
ISAD5
ISAD12
ISAD15
ISAD9
ISAD10
ISAD8
ISAD14
ISAD11
ISAD13
RSTDRV#
ISAA[1..21]
ISAD[0..15]
ROMCE#
ROMOE#
ROMWE#
VCC
VCC
R131
10K
U56
29F800-55 TSOP48
15
12
26
28
44
11
37
46
27
29
25
24
23
22
21
20
19
18
8
7
6
42
40
38
5
4
3
35
2
1
48
17
16
30
32
34
36
33
39
41
43
45
47
31
RY/BY#
RESET#
CE#
OE#
DQ7
WE#
VCC
GND
GND
DQ0
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
DQ6
DQ5
DQ4
A11
A12
A13
DQ3
A14
A15
A16
A17
A18
DQ8
DQ9
DQ10
DQ11
DQ2
DQ12
DQ13
DQ14
DQ15/A-1
BYTE#
DQ1
C115
0.1uF
C114
0.1uF