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Epson Research and Development
Vancouver Design Center
S1D13704
Hardware Functional Specification
X26A-A-001-04
Issue Date: 01/02/08
7.1.3 Motorola M68K #1 Interface Timing
Figure 7-3: M68K #1 Bus Timing (MC68000)
Note
CLK may be turned off (held low) between accesses - see Section 13.5, “Turning Off
BCLK Between Accesses” on page 86
Table 7-3: M68K #1 Bus Timing (MC68000)
Symbol
Parameter
Min
Max
Units
f
CLK
Bus Clock Frequency
0
33
MHz
T
CLK
Bus Clock period
1/f
CLK
t1
A[15:1], CS# valid before AS# falling edge
0
ns
t2
A[15:1], CS# hold from AS# rising edge
0
ns
t3
AS# low to DTACK# driven high
16
ns
t4
CLK to DTACK# low
15
ns
t5
AS# high to DTACK# high
20
ns
t6
AS# high to DTACK# high impedance
T
CLK
t7
UDS#, LDS# falling edge to D[15:0] valid (write cycle)
T
CLK
t8
D[15:0] hold from AS# rising edge (write cycle)
0
ns
t9
UDS#, LDS# falling edge to D[15:0] driven (read cycle)
15
ns
t10
D[15:0] valid to DTACK# falling edge (read cycle)
0
ns
t11
UDS#, LDS# rising edge to D[15:0] high impedance
10
ns
t3
A[15:1]
AS#
UDS#, LDS#
VALID
VALID
t1
t8
t2
t7
R/W#
Hi-Z
Hi-Z
INVALID
t5
t4
DTACK#
Hi-Z
Hi-Z
CLK
t6
T
CLK
CS#
t9
t10
Hi-Z
VALID
Hi-Z
D[15:0]
D[15:0]
t11
(write
(read)
*