tmp19a43fzxbg TOSHIBA Semiconductor CORPORATION, tmp19a43fzxbg Datasheet - Page 375

• Manufacturer Part Number: tmp19a43fzxbg
• Description: 32bit Tx System Risc
• Manufacturer: TOSHIBA Semiconductor CORPORATION

4.15
AD0~AD15
ALE
A0~A23,
BUSRQ
BUSAK
RD , WR
CS0 ~ CS3 ,
R
/
W
Note 1: If the current bus cycle has not terminated due to wait-state insertion, the TMP1941AF
Note 2: This broken lines indicate that output buffers are disabled, not that the signals are at
Bus Request and Bus Acknowledge Signals
, HWR
Bus float to BUSAK asserted
Bus float after BUSAK negated
does not respond to
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
resistors, 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.
Parameter
BUSRQ
(Note1)
Symbol
TMP1942CY/CZ-374
t
t
ABA
BAA
t
ABA
until the wait state ends.
Min
0
0
Equation
Max
80
80
(Note2)
(Note2)
Min
0
0
32 MHz
TMP1942CY/CZ
Max
80
80
Unit
ns
ns
t
BAA