COM20022V-HT View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
Manufacturer
COM20022V-HT Datasheet PDF : 88 Pages
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AD0-AD2,
D3-D15
nCS
ALE
nRD
VALID
t1
t2,
t4
t3
t9
t6
t5
VALID DATA
t10
t7
nWR
nIOCS16
Previous Value
t13 '*
t15
t14
Invalid
t8
t11
Valid Value
t12
'
MUST BE: BUSTMG pin = HIGH and RBUSTMG bit = 0
Parameter
min
max units
t1 Address Setup to ALE Low
t2 Address Hold from ALE Low
t3 nCS Setup to ALE Low
t4 nCS Hold from ALE Low
t5 ALE Low to nRD Low
t6 nRD Low to Valid Data
t7 nRD High to Data High Impedance
t8 Cycle Time (nRD Low to Next Time Low)
t9 ALE High Width
t10 ALE Low Width
t11 nRD Low Width
t12 nRD High Width
t13 nWR to nRD Low
t14 nIOCS16 Hold Delay from ALE Low
t15 nIOCS16 Output Delay from ALE Low
20
nS
10
nS
10
nS
10
nS
15
nS
40
nS
0
20
nS
4TARB*
nS
20
nS
20
nS
60
nS
20
nS
20
nS
0
nS
40
nS
* 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 1: The Microcontroller typically accesses the COM20022 on every other cycle.
Therefore, the cycle time specified in the microcontroller's datasheet
Note 2:
should be doubled when considering back-to-back COM20022 cycles.
!"#
% &
Note 3:
!"# +
&
' *(( ) &
FIGURE 17 - MULTIPLEXED BUS, 80XX-LIKE CONTROL SIGNALS; READ CYCLE
63
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