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COM20019IP датащи(PDF) 58 Page - SMSC Corporation

номер детали COM20019IP
подробное описание детали  Low Cost ARCNET (ANSI 878.1) Controller with 2K x 8 On-Board RAM
PDF  81 Pages
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производитель  SMSC [SMSC Corporation]
домашняя страница  http://www.smsc.com
Logo SMSC - SMSC Corporation

COM20019IP датащи(HTML) 58 Page - SMSC Corporation

Back Button COM20019IP Datasheet HTML 54Page - SMSC Corporation COM20019IP Datasheet HTML 55Page - SMSC Corporation COM20019IP Datasheet HTML 56Page - SMSC Corporation COM20019IP Datasheet HTML 57Page - SMSC Corporation COM20019IP Datasheet HTML 58Page - SMSC Corporation COM20019IP Datasheet HTML 59Page - SMSC Corporation COM20019IP Datasheet HTML 60Page - SMSC Corporation COM20019IP Datasheet HTML 61Page - SMSC Corporation COM20019IP Datasheet HTML 62Page - SMSC Corporation Next Button
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58
DISCONTINUED DATASHEET
AD0-AD2,
VALID
VALID DATA
nCS
t1
t3
t8
ALE
t2,
t6
t5
t4
t7
D3-D7
DIR
t9
t10
Note 2
t8**
t12
t11
nDS
t13
t14
Parameter
min
max
units
t1
t2
t3
t4
t5
t6
t7
t8
t9
t10
t11
t12
t13
t14
20
10
10
10
15
10
4TARB
*
10
10
20
20
20
20
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
Address Setup to ALE Low
Address Hold from ALE Low
nCS Setup to ALE Low
nCS Hold from ALE Low
ALE Low to nDS Low
Valid Data Setup to nDS High
Data Hold from nDS High
DIR Setup to nDS Active
DIR Hold from nDS Inactive
30
ALE High Width
ALE Low Width
nDS Low Width
nDS High Width
Cycle Time (nDS
to Next
)**
The Microcontroller typically accesses the COM20019 on every other cycle.
Therefore, the cycle time specified in the microcontroller's datasheet
should be doubled when considering back-to-back COM20019 cycles.
Note 1:
Any cycle occurring after a write to Address Pointer Low Register requires a
minimum of 4TARB from the trailing edge of nDS to the leading edge of the
next nDS.
Note 2:
**
TARB is the Arbitration Clock Period
TARB is identical to Topr if SLOW ARB = 0
*
TARB is twice Topr if SLOW ARB = 1
Topr is the period of operation clock. Same as the XTAL1 period.
Write cycle for Address Pointer Low Register occurring after an access to
Data Register requires a minimum of 5TARB from the trailing edge of nDS to
the leading edge of the next nDS.



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