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14
TS68302
2117A–HIREL–11/02
Notes:
1. For loading capacitance of less than or equal to 50 pF, subtract 4 ns from the value given in the maximum columns.
2. Actual value depends on clock period.
3. When AS and R/W are equally loaded (±20%), subtract 5 ns from the values given in these columns.
4. If the asynchronous input setup (#47) requirement is satisfied for DTACK, the DTACK asserted to data setup time (#31)
requirement can be ignored. The data must only satisfy the data-in to clock low setup time (#27) for the following clock cycle.
5. The TS68302 will negate BG and begin driving the bus if external arbitration logic negates BR before asserting BGACK.
6. The minimum value must be met to guarantee proper operation. If the maximum value is exceeded, BG may be reasserted.
7. If #47 is satisfied for both DTACK and BERR, #48 may be ignored. In the absence of DTACK, BERR is a synchronous input
using the asynchronous input setup time (#47).
8. For power-up, the TS68302 must be held in the reset state for 100 ms to allow stabilization of on-chip circuit. After the sys-
tem is powered up #56 refers to the minimum pulse width required to reset the processor.
9. Occurs on S0 of SDMA read/write access when the SDMA becomes bus master.
10. This specification is valid only when the RMCST bit is set in the SCR register.
44
t
SHVPH
AS, DS negated to AVEC negated
0
50
ns
46
t
GAL
BGACK width low
1.5
clks
47
t
ASI
Asynchronous input setup time
(4)
10
ns
48
t
BELDAL
BERR asserted to DTACK asserted
(2)(7)
10
ns
53
t
CHDOI
Data-out hold from clock high
0
ns
55
t
RLDBD
R/W asserted to data bus impedance change
0
ns
56
t
HRPW
HALT/RESET pulse width
(8)
10
clks
57
t
GASD
BGACK negated to AS, DS, R/W driven
1.5
clks
57A
t
GAFD
BGACK negated to FC
1
clks
58
f
RHSD
BR negated to AS, DS, R/W driven
(5)
1.5
clks
58A
t
RHFD
BR negated to FC
(5)
1
clks
60
t
CHBCL
Clock high to BCLR asserted
30
ns
61
t
CHBCH
Clock high to BCLR negated
(9)
30
ns
62
t
CLRML
Clock low (S0 falling edge during read) to RMC asserted
30
ns
63
t
CHRMH
Clock high (S7 rising edge during write) to RMC negated
30
ns
64
t
RMHGL
RMC negated to BG asserted
(10)
30
ns
Table 8.
AC Electrical Specifications
IMP Bus Master Cycles (see Figure 7, Figure 8 and Figure 9) f = 16.67 MHz (Continued)
Num.
Symbol
Parameter
Min
Max
Unit