TI380C30 Datasheet, PDF (37/78 Pages) Texas Instruments – INTEGRATED TOKEN-RING COMMPROCESSOR AND PHYSICAL-LAYER INTERFACE

TI380C30
INTEGRATED TOKEN-RING
COMMPROCESSOR AND PHYSICAL-LAYER INTERFACE
SPWS016A – NOVEMBER 1994 – REVISED JULY 1995
memory-bus timing: local-memory clocks, MAL, MROMEN, MBIAEN, NMI, MRESET, and ADDRESS
t_M is the cycle time of one-eighth of a local-memory cycle (31.25 ns minimum for a 4-MHz local bus or
20.83 ns minimum for a 6-MHz local bus).
NO.
MIN
MAX UNIT
1 Period of MBCLK1 and MBCLK2
4tM
ns
2 Pulse duration, clock high
2tM – 9
ns
3 Pulse duration, clock low
2tM – 9
ns
4 Hold time, MBCLK2 low after MBCLK1 high
tM – 9
ns
5 Hold time, MBCLK1 high after MBCLK2 high
tM – 9
ns
6 Hold time, MBCLK2 high after MBCLK1 low
tM – 9
ns
7 Hold time, MBCLK1 low after MBCLK2 low
tM – 9
ns
8 Setup time, address / enable on MAX0, MAX2, and MROMEN before MBCLK1 no longer high
tM – 9
ns
9 Setup time, row address on MADL0 – MADL7, MAXPH, and MAXPL before MBCLK1 no longer high
tM – 14
ns
10 Setup time, address on MADH0 – MADH7 before MBCLK1 no longer high
tM – 14
ns
11 Setup time, MAL high before MBCLK1 no longer high
13
ns
12 Setup time, address on MAX0, MAX2, and MROMEN before MBCLK1 no longer low
0.5tM – 9
ns
13
Setup time, column address on MADL0 – MADL7, MAXPH, and MAXPL before MBCLK1 no
longer low
0.5tM – 9
ns
14 Setup time, status on MADH0 – MADH7 before MBCLK1 no longer low
120 Setup time, NMI valid before MBCLK1 low
0.5tM – 9
ns
30
ns
121 Hold time, NMI valid after MBCLK1 low
0
ns
126 Delay time, MBCLK1 no longer low to MRESET valid
0
20 ns
129 Hold time, column address / status after MBCLK1 no longer low
tM – 7
ns
Reference
4 Periods
8 Periods
12 Periods
16 Periods
20 Periods
OSCIN
(when CLKDIV = 1)
OSCIN
(when CLKDIV = 0)
OSCOUT
MBCLK1 ^†
MBCLK2 ^†
† _{MBCLK1 and MBCLK2 have no timing relationship to OSCOUT. MBCLK1 and MBCLK2 can start on any OSCIN rising edge, depending on when}
the memory cycle starts execution.
Figure 10. Clock Waveforms After Clock Stabilization
• POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443
37