98561-66519
Processor
Board
General
Description
The
98561-66519 processor board has the following features:
• MC6840 Systeln Timer.
• 16.6 MHz MC68020 microprocessor.
• Optional l\fC68881 Floating-Point Coprocessor
• Boot ROM.
• Eight Self-Test LEDs
• 32-bit wide Virtual Cache Memory
• 32-bit wide Memory Management Unit
•
Miscellaneous other components needed by HP Operating Systems (HP-UX, Pascal, BA-
SIC).
Figure 3-11
is
a block diagram
of
the 98561-66519 processor. Refer to this diagram
for
functional
descriptions.
~--
---
-",'''''' -
-[~
--------
U29
COP
TA(22:2)
--
PA(23:1)
----
>-------
r-PO(31
:0)
CACHE
TLB
-
MMU
PROCESSOR
,-
PROC
CONTROL
8PO(31
:0)
U42
~~
10(15:0)
PROC_CONTROL
010
INT
~~:O)
-
1 I
WALKEN'"
~~U
CONTROL
~OEN'"
TWR'"
TOE'"
~---
PROC_CONTROL
f-~
--
~~E~~
PAl
Cl
~
--~>--
PROC
.f~
PA3
102
I"
BLA(23:21).BLA13
1015
-----------
CONTROL
L,.
010
CONTROL
--
S
PINO~
OSKO'"
TEST
SLKUP'"
aSK1'"
I--
--
Figure 3-11. 98561-66519 Processor Board Block Diagram
Functional Description
57
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