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COM20020 датащи(PDF) 53 Page - SMSC Corporation

номер детали COM20020
подробное описание детали  COM20020 3.3V ULANC Universal Local Area Network Controller with 2K x 8 On-Board RAM
PDF  72 Pages
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производитель  SMSC [SMSC Corporation]
домашняя страница  http://www.smsc.com
Logo SMSC - SMSC Corporation

COM20020 датащи(HTML) 53 Page - SMSC Corporation

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53
FIGURE 12 - MULTIPLEXED BUS, 80XX-LIKE CONTROL SIGNALS; READ CYCLE
AD0-AD2,
VALID
nCS
t1
t3
t8
ALE
VALID DATA
t2,
t6
t5
t4
t7
D3-D7
nRD
t9
t10
nWR
t13
t11
t12
"#
"$
ALE High Width
ALE Low Width
nRD Low Width
nRD High Width
nWR
to nRD Low
Parameter
min
max
units
t1
t2
t3
t4
t5
t6
t7
t8
t9
t10
t11
t12
t13
Address Setup to ALE Low
Address Hold from ALE Low
nCS Setup to ALE Low
nCS Hold from ALE Low
ALE Low to nRD Low
nRD Low to Valid Data
nRD High to Data High Impedance
Cycle Time (nRD Low to Next Time Low)
20
10
10
10
15
0
4TARB
*
40
20
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
MUST BE: RBUSTMG bit = 0
20
20
60
20
20
The Microcontroller typically accesses the COM20020 on every other cycle.
Therefore, the cycle time specified in the microcontroller's datasheet
should be doubled when considering back-to-back COM20020 cycles.
Note 1:
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. It depends on CKUP1 and CKUP0 bits
Note 2:
         
      
 !
Note 3:
        
      %
!



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