tmp19a43fd TOSHIBA Semiconductor CORPORATION, tmp19a43fd Datasheet - Page 103

• Manufacturer Part Number: tmp19a43fd
• Description: 32-bit Risc Microprocessor
• Manufacturer: TOSHIBA Semiconductor CORPORATION

AD0~AD15
ALE
A0~A23,
BUSRQ
BUSAK
RD , WR
R
CS0 ~ CS3 ,
/
5.17
W
Note 1: If the current bus cycle has not terminated due to wait-state insertion, the
Note 2: This broken line indicates that output buffers are disabled, not that the signals
, HWR
Bus Request and Bus Acknowledge Signals
TMP19A43FDXBG does not respond to
are at indeterminate states. The pin holds the last logic value present at that pin
before the bus is relinquished. This is dynamically accomplished through external
load capacitances. The equipment manufacturer may maintain the bus at a
predefined state by means of off-chip restores, but he or she should design,
considering the time (determined by the CR constant) it takes for a signal to
reach a desired state. The on-chip, integrated programmable pullup/pulldown
resistors remain active, depending on internal signal states.
Bus float to
Bus float after
Parameter
BUSAK
BUSAK
asserted
negated
(Note1)
t
ABA
Symbol
t
t
ABA
BAA
TMP19A43 5-32
BUSRQ
Min
0
0
Equation
until the wait state ends.
Max
80
80
(Note2)
(Note2)
Min
0
0
40 MHz
Max
80
80
TMP19A43
t
BAA
Unit
ns
ns