74hct7403 NXP Semiconductors, 74hct7403 Datasheet - Page 26

• Manufacturer Part Number: 74hct7403
• Description: 4-bit X 64-word Fifo Register; 3-state
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Notes to Fig.22
1. FIFO
2. Unload one word from FIFO
3. DIR
4. DOR
5. DOR
6. DIR
September 1993
handbook, full pagewidth
4-Bit x 64-word FIFO register; 3-state
data is shifted out of FIFO
bubble-up of empty location
B
A
A
A
A
and SO
goes HIGH; (bubble-up delay after SO
and SI
and SI
and FIFO
A
B
B
go HIGH; flag indicates valid data is again available at FIFO
pulse HIGH; (bubble-up delay after SO
go LOW; flag indicates the output stage of FIFO
B
initially full, SI
DOR B
Fig.22 FIFO to FIFO communication; output timing under full condition.
SO B
DIR B
DOR A SI B
DIR A
Q nA
D
SO A
nB
A
B
; SO pulse applied, results in DOR pulse
1
B
held HIGH in anticipation of shifting in new data as an empty location bubbles-up
V M
(1)
V M
(1)
A
LOW) an empty location is present at input stage of FIFO
2
bubble - up
delay
B
26
LOW) data is loaded into FIFO
V M
4
(1)
A
V M
3
is busy, shift-in to FIFO
(1)
bubble - up
A
delay
output stage, SI
5
V M
MGA667
B
(1)
6
as a result of the DIR pulse,
B
74HC/HCT7403
is complete
B
is held HIGH, awaiting
Product specification
A
.