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(6) HDC Data Set
A7
Address
X
D7
Data
X
AO
X
X
0
0
DO
When this command is executed
,
data on 8-bit bidirec-
tional data bus DO-D7 are set to Output Data Esuffer.
(7) Status 0 Set
A7
AO
Address
X
X
X
X
0
D7
DO
Data
When this command is executed
,
status on 8-bit bi
-
directional data bus DO-D7 is set to Status 0 Register.
(8) Abort
A7
AO
Address
X
X
X
X
0
0
0
When this command is executed, the following
Flip-
Flops are reset
:
*Channel 0 Execution
* HDC Data Request Enable
*Host Data Request Enable
*
HDC DMA Mode
*
Host DMA Mode
*
Host DMA End
*Command Interrupt
7-4. NDC847
1) GENERAL
1 )-1. Basic Concept
NDC847 is a hybrid IC of an analog PLL
circuit.
1)-2. Features
( 1) functions as data separator by being combined with
NDC10-5 (MB1 13T1 19) or NDC842.
(2) has an internal linear circuit and receives a digital signal.
(3) compact and requires fewer parts in order to build
circuit in comparison with a
circ
uit using discrete parts
.
(4) non-adjustable and reliable.
(5) functions as data transfer VCO of ST506,
5MBit/sec.
(6) 16-pin single-line IC and mountable as a regular IC
.
(7) power supply: DC ±5V
.
-
25
-
1 )-3 Pin assignment
NO
.
SYMBOL
1
I
N
3
2
VEE
3
I
N
4
4
I
N
1
5
vue
6
I
N
2
7
GND
8
TP
NO.
9
10
11
12
13
14
15
16
-
M Z-5600A
SYMBOL
KC
O
KOI
L2
A
-B
CMP
L 1
OUT
[.....
NDC847
J
~~~~~~~~~~~~~~~~
Pin
1
NO
.
-+
2 3 4 5 6
7 8 9 10 11 12 13 14 15 16
Single- 16pin
,
2 .54mm pitch
1 )-4. Block Diagram
1)-4-1.
CllAAGE I'UWJ'
oU
P
£>--+--
·
UP£>--+--
oOW
(>-f---
- ow'
D-f---
INIIUIIT CAT£
I
1. Basic Structure Diagram of NCL-type PLL Circuit
1 )-4-2.
IN
IIIIIIT
GATE
2. Structure of the connections of NDC847
2) OPERATIONS
N DC84 7 acts as a data separator for the ST506 Hard Disk
Drive Interface by being combined with an NCL VFO data
encoder/decoder
.
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