Data General NOVA 4/S Manual page 125

Data General Corporation (DGC) has prepared this manual for use by DGC personnel and customers as a guide to the proper installation, operation, and
maintenance of DGC equipment and software. The drawings and specifications contained herein are the property of DGC and shall neither be reproduced in whole
or in part without DGC's prior written approval nor be implied to grant any license to make, use, or sell equipment manufactured in accordance herewith.
Data General Corporation (DGC) has prepared this manual for use by DGC personnel and customers as a guide to the proper installation, operation, and
maintenance of DGC equipment and software. The drawings and specifications contained herein are the property of DGC and shall neither be reproduced in whole
or in part without DGC's prior written approval nor be implied to grant any license to make, use, or sell equipment manufactured in accordance herewith.
-200 -100 0
A t e r e r p o c c c s o
J
L
|
|
Double Precision Data Transfer From Memory To FPU
100 200 300 400 500
ADDRESS 1 ADORESS 4
\ l
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Le
4
4 4
t
Lo LS
|
t i t t e d p e e
1
— +
— —
L
' i
600 700
MEMSTART
|
|
ond
|
t
P p } pf
LJ (
4.
+
J
|
i
|
FPINST fers
— SELD
FPCPLU —————wy_ FPU
SELECT I
| | | B-REGISTER } MANTISSA WORKING
|
| A-REGISTER EXPONENT PROCESSOR s
|
; 2-PORT A-EXPONENT
B-REGISTER SELECT EXPONENT EXPONENT | EXPONENT
'
EXPONENT TO CPU
TO MEMORY (
= A =
Fig ure 13.1. FLOATING POINT UNIT BLOCK DIAGRAM
113
e m e e e e e e e e
)
|
|
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'
jo
L
1
1
T E L E — — t — + ) / — + 4 - / - - + 4 + - ~ ~ t e
— _ — ~ { i - b { 4 - L d -
Oo
-%
t L } o e
- - 4 4
RH
4 - - H - h T -
4.
T
— — + — +
Ul
P a r
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T
1
¥
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—+ |
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1
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ees
Er
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1. For single precision data transfers only two words are transferred.
2. MEMCLK may be held low in 100 ns increments by MEMSORRY.
3. All times are in nanoseconds.
—+
_|
~L+
4S
seb
a es
—t
|
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— + —
Figure 13.2. TIMING DIAGRAM FOR DATA TRANSFER BETWEEN MEMORY AND THE FPU OR CPU