National CP3BT26 User Manual
263
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CP3
BT26
30.16
EXTERNAL BUS TIMING
Table 93
External Bus Signals
Symbol Figure
Description
Reference
Min (ns)
Max (ns)
External Bus Input Signals
t
1
Input Setup Time
D[15:0]
D[15:0]
Before Rising Edge (RE)
on CLK
on CLK
8
t
2
Output Hold Time
D[15:0]
D[15:0]
After RE on CLK
0
External Bus Output Signals
t
3
Output Valid Time
D[15:0]
D[15:0]
After RE on CLK
8
t
4
Output Valid Time
A[22:0]
A[22:0]
After RE on CLK
8
t
5
Output Active/Inactive Time
RD
SEL[1:0]
SELIO
RD
SEL[1:0]
SELIO
After RE on CLK
8
t
6
Output Active/Inactive Time
WR[1:0]
WR[1:0]
After RE on CLK
0.5 Tclk + 8
t
7
Minimum Inactive Time
RD
RD
At 2.0V
Tclk - 4
t
8
Output Float Time
D[15:0]
D[15:0]
After RE on CLK
8
t
9
Minimum Delay Time
From RD Trailing Edge
(TE) to D[15:0] driven
(TE) to D[15:0] driven
Tclk - 4
t
10
Minimum Delay Time
From RD TE to SELn
Leading Edge (LE)
Leading Edge (LE)
0
t
11
Minimum Delay Time
From SELx TE to SELy LE
0
t
12
Output Hold Time
A[22:0]
D[15:0]
RD
SEL[2:0]
SELIO
A[22:0]
D[15:0]
RD
SEL[2:0]
SELIO
After RE on CLK
0
t
13
Output Hold Time
WR[1:0]
WR[1:0]
After RE on CLK
0.5 Tclk - 3