tmp19a44fda TOSHIBA Semiconductor CORPORATION, tmp19a44fda Datasheet - Page 668

• Manufacturer Part Number: tmp19a44fda
• Description: 32bit Tx System Risc
• Manufacturer: TOSHIBA Semiconductor CORPORATION

AD0~AD15
ALE
Electrical Characteristics
A0~A23,
BUSRQ
BUSAK
RD , WR
CS0 ~ CS3 ,
R
/
27.16 Bus Request and Bus Acknowledge Signals
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
TMP19A44 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
TMP19A44 (rev1.3) 27-28
Symbol
t
t
ABA
BAA
BUSRQ
Min
until the wait state ends.
0
0
Equation
Max
80
80
(Note2)
(Note2)
Min
0
0
80 MHz
Max
80
80
TMP19A44
t
BAA
Unit
ns
ns
2010-04-01