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Epson Research and Development Page 31
Vancouver Design Center
Hardware Functional Specification S1D13705
Issue Date: 02/02/01 X27A-A-001-10
7.1.4 Motorola MC68K #2 Interface Timing
Figure 7-4: MC68K #2 Timing (MC68030)
Note
CLK may be turned off (held low) between accesses - see Section 13.5, “Turning Off
BCLK Between Accesses” on page 84
Table 7-4: MC68K #2 Timing (MC68030)
Symbol Parameter Min Max Units
f
CLK
Bus Clock frequency 33 MHz
T
CLK
Bus Clock period 1/f
CLK
t1 A[16:0], CS#, SIZ0, SIZ1 valid before AS# falling edge 0 ns
t2 A[16:0], CS#, SIZ0, SIZ1 hold from AS#, DS# rising edge 0 ns
t3 AS# low to DSACK1# driven high 22 ns
t4 CLK to DSACK1# low 18 ns
t5 CLK to AS#, DS# high 1T
CLK
ns
t6 AS# high to DSACK1# high 20 ns
t7 AS# high to DSACK1# high impedance T
CLK
t8 DS# falling edge to D[31:16] valid (write cycle) T
CLK
/2
t9 AS#, DS# rising edge to D[31:16] invalid (write cycle) 0 ns
t10 D[31:16] valid to DSACK1# low (read cycle) 0 ns
t11 AS#, DS# rising edge to D[31:16] high impedance 20 ns
A[16:0]
AS#
DS#
VALID
t1
t9
t2
t8
R/W#
Hi-Z
CS#
SIZ0, SIZ1
CLK
t6
t3
t4
DSACK1#
Hi-Z
Hi-Z
t7
T
CLK
t10
VALID
Hi-Z
Hi-Z
D[31:16]
D[31:16]
VALID
Hi-Z
t11
(write)
(read)
t5