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DR- UA124X
-
2, DR- UA124X-3
DR - UA124X
-
5
• WD25C32
{ IC855 : MOTHER BOARD ASSY)
·ATAPIHOSTINTERFACE
•
Pin
Arrangement
(Top view)
r::
r::
:c
8
8
I
~
Ii!
>-
.....
<n
~
:g :g
C';
8
8
~
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8
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C>
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:z
:z
:z
:z
>
:z
:z
:z
:z
0
0)
"'
.....
CD
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..
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o;
0
0)
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.....
CD
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0
0)
0)
0)
0)
0)
0)
0)
0)
0)
"' "'
"'
"'
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1
0
VDD
O
UT
DO
DI
02
03
04
8
05
9
06
10
07
11
VSS OUT
12
VSS COR
E
13
V
DD COR
E
14
RAMT
15
PDiAG
16
DASP
17
VSS
OUT
18
IOCHRDY
19
VDD
OUT
20
HOO
21
HDl
22
23
VSS
OUT
24
25
CD
.....
"'
0)
0
;;;
N
"'
..
"'
CD
.....
"'
0)
0
:;;;
N
N
N
N
"'
"'
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"'
"'
"'
"'
"'
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~
>-
M
>-
C';
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8
>-
§
-'
>-
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8
C>
a
C>
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C>
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:c
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8
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8
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8 8
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>
>
>
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>
• Block Diagram
HOST
INTERFACE
INTERNAL BUFFER CONTROL
HOST
CDROM
HD0
-
15
DATA
DATA
LATCH
LATCH
HOST
(2
BYTES)
(2
BYTES)
INTERFACE
ATAPI
TASK
FILE
STATIC
BLOCK
RAM
LENGTH
ADDRESS
COUNTERS
GENERATOR
STATIC
5
12
BYTES
DATA
RAM
STATIC
CONTROL
RAM
INTERFACE
ARBITER
(CMD/ DATA)
C DRO
M DRIVE NATIVE
INTERFAC
E(S)
CONTROL
DATA
CONTROL
INTERFACE
INTERFACE
INTERFACE
88-90,
92,
94-96.
98
N
D0-
7
34
(
I
I
>-
r::
a
a
I~
0
~
' j
~
IB
151
Ii
~
>
CJ
>
:z
..
"'
N
;;;
0
0)
"'
.....
CD
"' "' "'
"'
..... .....
..... .....
75
74
73
RS
72
ilRSf
7
1
HIOll
70
HIOR
69
i5iiCK
68
vss
oun
67
HCSf
66
ilCSO
65
HA2
64
HAl
63
HAO
62
VDD
CORE
61
VSS CORE
60
OREO
59
HINTRQ
58
VSS
OUT
57
V
DD OUT
56
~
55
H
D 15
(
54
H
D
14
53
VSS
OUT
52
VDD OUT
5
1
N
"'
..
"'
CD
.....
"'
0)
0
.. ..
..
..
..
..
.. ..
"'
8
>-
0
>-
N
M
§
a
C>
C>
a
0
0
"'
:c
"'
"'
"'
~
8
~
>
>
>
SCANSEL TESTH
RAMT
(
MISC.
CLK,
TEST
LOGIC
UP
INTERFACE
UP
CONTROL
INTERFACE
UP
DATA
REGISTERS
UP
(
STATUS
&
INTERRUPTS
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