MC68HC912BD32 Datasheet, PDF (178/292 Pages) Freescale Semiconductor, Inc – Advance Information

Freescale Semiconductor, Inc.
Byteflight™ Module
Byteflight™ Timing
Parameters
Table 34 Parameter of the Byteflight™ System
Symbol
t_bit
t_cyc
t_cyc_min
t_cyc_max
t_max
t_tolerance
t_idle_min
t_syn_a
t_syn_a_min
t_syn_a_max
t_syn_n
t_syn_n_min
t_syn_n_max
t_w0
ID
ID_x-1
Characteristic
Description
Typ
bit time
cycle time (note 2)
time for the transmission of one bit, defined by the
physical limitations of the system
time distance between the end of the SYNC pulses
100 ns
250 µs⁽¹⁾
min cycle time
min time distance between the end of the SYNC
pulses
249.725µs
max cycle time
max time distance between the end of the SYNC
pulses
250.275µs
maximum run time of a
signal in the bus system
max run time of a signal between a transmit module tbd,
and the recognition by a receive module
ca 400ns
tolerance of the run time of
a signal in the bus system
is the sum of all tolerances
tbd,
ca 300ns
min bus idle time
Sync pulse ALARM
min bus idle time between two messages or the
SYNC pulse and a message
duration of the Sync pulse in the case of ALARM
11 * t_bit
2 µs⁽²⁾
Sync pulse ALARM, min
pulse width
min duration of the Sync pulse in the case of ALARM 1.85 µs
Sync pulse ALARM, max
pulse width
Sync pulse NORMAL
max duration of the Sync pulse in the case of
ALARM
duration of the Sync pulse in the normal case
2.15 µs
3 µs⁽³⁾
Sync pulse NORMAL, min
pulse width
min duration of the Sync pulse in the normal case
2.85 µs
Sync pulse NORMAL, max
pulse width
max duration of the Sync pulse in the normal case
3.15 µs
Sync pulse wait time
minimum time between end of a message and end
of SYNC pulse, t_w0 >= t_idle_min + t_syn_n_max
< 6000ns
Identifier
allowed values between 1 .. 255
previous Identifier
Identifier of the previously received or transmitted
message. When the Sync pulse was the last activity
on the bus, then IDx-1 = 0
MC68HC912BD32 Rev 1.0
Byteflight™ Module
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8-sibus