CMOS CLOCKED FIFO WITH
BUS-MATCHING AND
BYTE SWAPPING 64 x 36
FEATURES
•
IDT723613
•
•
•
•
•
•
•
•
•
•
•
Free-running CLKA and CLKB may be asynchronous or
coincident (permits simultaneous reading and writing of data on
a single clock edge)
64 x 36 storage capacity FIFO buffering data from Port A to
Port B
Mailbox bypass registers in each direction
Dynamic Port B bus sizing of 36 bits (long word), 18-bits (word),
and 9 bits (byte)
Selection of Big- or Little-Endian format for word and byte bus
sizes
Three modes of byte-order swapping on Port B
Programmable Almost-Full and Almost-Empty flags
Microprocessor interface control logic
FF, AF
flags synchronized by CLKA
EF, AE
flags synchronized by CLKB
Passive parity checking on each Port
Parity Generation can be selected for each Port
•
•
•
•
•
Supports clock frequencies up to 67 MHz
Fast access times of 10 ns
Available in 132-pin quad flatpack (PQFP) or space-saving
120-pin thin quad flatpack (TQFP)
Industrial temperature range (–40°C to +85°C) is available
°
°
Green parts available, see orderng information
DESCRIPTION
The IDT723613 is a monolithic, high-speed, low-power, CMOS synchro-
nous (clocked) FIFO memory which supports clock frequencies up to 67 MHz
and has read-access times as fast as 10 ns. The 64 x 36 dual-port SRAM FIFO
buffers data from port A to port B. The FIFO has flags to indicate empty and full
conditions, and two programmable flags, Almost-Full (AF) and Almost-Empty
(AE), to indicate when a selected number of words is stored in memory. FIFO
data on port B can be output in 36-bit, 18-bit, and 9-bit formats with a choice of
big- or Little-Endian configurations. Three modes of byte-order swapping are
possible with any bus-size selection. Communication between each port can
bypass the FIFO via two 36-bit mailbox registers. Each mailbox register has
FUNCTIONAL BLOCK DIAGRAM
CLKA
CSA
W/RA
ENA
MBA
Port-A
Control
Logic
Parity
Gen/Check
MBF1
PEFB
PGB
Bus-Matching and
Output
Byte Swapping
Register
RST
ODD/
EVEN
Mail 1
Register
Parity
Generation
Input
Register
RAM ARRAY
64 x 36
Output
Register
Device
Control
36
64 x 36
36
Write
Pointer
FF
AF
FIFO
Read
Pointer
B
0
- B
35
Status Flag
Logic
Programmable
Flag Offset
Registers
FS
0
FS
1
A
0
- A
35
PGA
PEFA
MBF2
Port-B
Port-B
Control
Control
Logic
Logic
Parity
Gen/Check
Mail 2
Register
3145 drw01
EF
AE
CLKB
CSB
W/RB
ENB
BE
SIZ0
SIZ1
SW0
SW1
IDT and the IDT logo are registered trademarks of Integrated Device Technology Inc. SyncFIFO is a trademark of Integrated Device Technology, Inc.
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
1
JUNE 2005
DSC-3145/2
© 2005 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice.
IDT723613 CMOS CLOCKED FIFO WITH
BUS-MATCHING AND BYTE SWAPPING 64 x 36
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
DESCRIPTION (CONTINUED)
a flag to signal when new mail has been stored. Parity is checked passively
on each port and may be ignored if not desired. Parity generation can be
selected for data read from each port. Two or more devices may be used in
parallel to create wider data paths.
The IDT723613 is a synchronous (clocked) FIFO, meaning each port
employs a synchronous interface. All data transfers through a port are gated
to the LOW-to-HIGH transition of a continuous (free-running) port clock by
enable signals. The continuous clocks for each port are independent of one
another and can be asynchronous or coincident. The enables for each port are
arranged to provide a simple interface between microprocessors and/or buses
with synchronous interfaces.
The Full Flag (FF) and Almost-Full (AF) flag of the FIFO are two-stage
synchronized to the port clock (CLKA) that writes data into its array. The Empty
Flag (EF) and Almost-Empty (AE) flag of the FIFO are two-stage synchronized
to the port clock (CLKB) that reads data from its array.
The IDT723613 is characterized for operation from 0°C to 70°C.
PIN CONFIGURATIONS
A
24
A
25
A
26
V
CC
A
27
A
28
A
29
GND
A
30
A
31
A
32
A
33
A
34
A
35
GND
B
35
B
34
B
33
B
32
B
31
B
30
GND
B
29
B
28
B
27
V
CC
B
26
B
25
B
24
B
23
A
23
A
22
A
21
GND
A
20
A
19
A
18
A
17
A
16
A
15
A
14
A
13
A
12
A
11
A
10
GND
A
9
A
8
A
7
V
CC
A
6
A
5
A
4
A
3
GND
A
2
A
1
A
0
NC
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
120
119
118
117
116
115
114
113
112
111
110
109
108
107
106
105
104
103
102
101
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
B
22
B
21
GND
B
20
B
19
B
18
B
17
B
16
B
15
B
14
B
13
B
12
B
11
B
10
GND
B
9
B
8
B
7
V
CC
B
6
B
5
B
4
B
3
GND
B
2
B
1
B
0
EF
AE
NC
AF
FF
CSA
ENA
CLKA
W/RA
V
CC
PGA
PEFA
MBF2
MBA
FS
1
FS
0
ODD/EVEN
RST
GND
BE
SW1
SW0
SIZ1
SIZ0
MBF1
PEFB
PGB
V
CC
W/RB
CLKB
ENB
CSB
NC
TQFP (PN120-1, ORDER CODE: PF)
TOP VIEW
2
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
NOTES:
1. Pin 1 identifier in corner.
2. NC = No internal connection.
3145 drw02
TEMPERATURE RANGES
JUNE 14, 2005
IDT723613 CMOS CLOCKED FIFO WITH
BUS-MATCHING AND BYTE SWAPPING 64 x 36
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
PIN CONFIGURATIONS (CONTINUED)
AF
FF
CSA
ENA
CLKA
W/RA
V
CC
PGA
PEFA
GND
MBF2
MBA
FS
1
FS
0
ODD/EVEN
RST
GND
BE
SW1
SW0
SIZ1
SIZ0
MBF1
GND
PEFB
PGB
V
CC
W/RB
CLKB
ENB
CSB
NC
NC
GND
NC
NC
A
0
A
1
A
2
GND
A
3
A
4
A
5
A
6
V
CC
A
7
A
8
A
9
GND
A
10
A
11
V
CC
A
12
A
13
A
14
GND
A
15
A
16
A
17
A
18
A
19
A
20
GND
A
21
A
22
A
23
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
132
131
130
129
128
127
126
125
124
123
122
121
120
119
118
117
V
CC
A
24
A
25
A
26
GND
A
27
A
28
A
29
V
CC
A
30
A
31
A
32
GND
A
33
A
34
A
35
GND
B
35
B
34
B
33
GND
B
32
B
31
B
30
V
CC
B
29
B
28
B
27
GND
B
26
B
25
B
24
V
CC
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
116
115
114
113
112
111
110
109
108
107
106
105
104
103
102
101
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
GND
AE
EF
B
0
B
1
B
2
GND
B
3
B
4
B
5
B
6
V
CC
B
7
B
8
B
9
GND
B
10
B
11
V
CC
B
12
B
13
B
14
GND
B
15
B
16
B
17
B
18
B
19
B
20
GND
B
21
B
22
B
23
3145 drw03
NOTES:
1. Electrical pin 1 in center of beveled edge.
2. NC = No internal connection.
3. Uses Yamaichi socket IC51-1324-828.
PQFP
(3)
(PQ132-1, ORDER CODE: PQF)
TOP VIEW
3
JUNE 14, 2005
IDT723613 CMOS CLOCKED FIFO WITH
BUS-MATCHING AND BYTE SWAPPING 64 x 36
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
PIN DESCRIPTION
Symbol
A
0
-A
35
AE
AF
B
0
-B
35
BE
CLKA
CLKB
Name
Port A Data
Almost-Empty Flag
Almost-Full Flag
Port B Data
Big-Endian Select
Port A Clock
Port B Clock
I/O
I/O
O
Port B
O
Port A
I/O
I
I
I
36-bit bidirectional data port for side A.
Programmable Almost-Empty flag synchronized to CLKB. It is LOW when Port B the number of 36-bit
words in the FIFO is less than or equal to the value in the offset register, X.
Programmable Almost-Full flag synchronized to CLKA. It is LOW when the number of 36-bit empty location
in the FIFO is less than or equal to the value in the offset register, X.
36-bit bidirectional data port for side B
Selects the bytes on port B used during byte or word FIFO reads. A LOW on
BE
selects the most significant
bytes on B
0
-B
35
for use, and a HIGH selects the least significant bytes.
CLKA is a continuous clock that synchronizes all data transfers through port A and can be asynchronous or
coincident to CLKB.
FF
and
AF
are synchronized to the LOW-to-HIGH transition of CLKA.
CLKB is a continuous clock that synchronizes all data transfers through port B and can be asynchronous or
coincident to CLKA. Port-B byte swapping and data port sizing operations are also synchronous to the
LOW-to-HIGH transition of CLKB.
EF
and
AE
are synchronized to the LOW-to-HIGH transition of CLKB.
CSA
must be LOW to enable a LOW-to-HIGH transition of CLKA to read or write data on port A. The
A
0
-A
35
outputs are in the high-impedance state when
CSA
is HIGH.
CSB
must be LOW to enable a LOW-to-HIGH transition of CLKB to read or write data on port B. The
B
0
-B
35
outputs are in the high-impedance state when
CSB
is HIGH.
EF
is synchronized to the LOW-to-HIGH transition of CLKB. When
EF
is LOW, the FIFO is empty, and
reads from its memory are disabled. Data can be read from the FIFO to its output register when
EF
is
HIGH.
EF
is forced LOW when the device is reset and is set HIGH by the second LOW-to-HIGH transition
of CLKB after data is loaded into empty FIFO memory.
ENA must be HIGH to enable a LOW-to-HIGH transition of CLKA to read or write data on port A.
ENB must be HIGH to enable a LOW-to-HIGH transition of CLKB to read or write data on port B.
FF
is synchronized to the LOW-to-HIGH transition of CLKA. When
FF
is LOW, the FIFO is full, and writes
to its memory are disabled.
FF
is forced LOW when the device is reset and is set HIGH by the second
LOW-to-HIGH transition of CLKA after reset.
The LOW-to-HIGH transition of
RST
latches the values of FS
0
and FS
1
, which loads one of four preset
values into the Almost-Full flag and Almost-Empty flag offsets.
A high level on MBA chooses a mailbox register for a port A read or write operation. When the A0-A35
outputs are active, mail2 register data is output.
MBF1
is set LOW by a LOW-to-HIGH transition of CLKA that writes data to the mail1 register. Writes to the
mail1 register are inhibited while
MBF1
is set LOW.
MBF1
is set HIGH by a LOW-to-HIGH transition of
CLKB when a port B read is selected and both SIZ1 and SIZ0 are HIGH.
MBF1
is set HIGH when the
device is reset.
MBF2
is set LOW by a LOW-to-HIGH transition of CLKB that writes data to the mail2 register. Writes to
the mail2 register are inhibited while
MBF2
is set LOW.
MBF2
is set HIGH by a LOW-to-HIGH transition
of CLKA when a port A read is selected and MBA is HIGH.
MBF2
is set HIGH when the device is reset.
Odd parity is checked on each port when ODD/EVEN is HIGH, and even parity is checked when ODD
EVEN
is LOW. ODD/EVEN also selects the type of parity generated for each port if parity generation is
enabled for a read operation.
Description
CSA
CSB
EF
Port A Chip Select
Port B Chip Select
Empty Flag
I
I
O
Port B
ENA
ENB
FF
Port A Enable
Port B Enable
Full Flag
I
I
O
Port A
I
I
O
FS
1
, FS
0
MBA
MBF1
Flag Offset Selects
Port A Mailbox Select
Mail1 Register Flag
MBF2
Mail2 Register Flag
O
ODD/
EVEN
PEFA
Odd/Even Parity Select
I
Port A Parity Error Flag
O
When any byte applied to terminals A
0
-A
35
fails parity,
PEFA
is LOW. Bytes are organized as A
0
-A
8
, A
9
-A
17
,
(Port A) A
18
-A
26
, and A
27
-A
35
, with the most significant bit of each byte serving as the parity bit. The type of parity
checked is determined by the state of the ODD/EVEN input. The parity trees used to check the A
0
-A
35
inputs are shared by the mail2 register to generate parity if parity generation is selected by PGA. Therefore,
if a mail2 read with parity generation is set up by having
CSA
LOW, ENA HIGH, W/RA LOW, MBA HIGH
and PGA HIGH, the
PEFA
flag is forced HIGH regardless of the state of the A
0
-A
35
inputs.
O
(PortB)
When any valid byte applied to terminals B
0
-B
35
fails parity,
PEFB
is LOW. Bytes are organized as B
0
-B
8
,
B
9
-B
17
, B18-B26, and B
27
-B
35
, with the most significant bit of each byte serving as the parity bit. A byte is
valid when it is used by the bus size selected for port B. The type of parity checked is determined by the
state of the ODD/EVEN input. The parity trees used to check the B
0
-B
35
inputs are shared by the mail1
register to generate parity if parity generation is selected by PGB. Therefore, if a mail1 read with parity
generation is set up by having
CSB
LOW, ENB HIGH, W/RB LOW, SIZ1 and SIZ0 HIGH and PGB
TEMPERATURE RANGES
HIGH, the
PEFB
flag is forced HIGH regardless of the state of the B
0
-B
35
inputs.
PEFB
Port B Parity Error Flag
4
JUNE 14, 2005
IDT723613 CMOS CLOCKED FIFO WITH
BUS-MATCHING AND BYTE SWAPPING 64 x 36
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
PIN DESCRIPTION (CONTINUED)
Symbol
PGA
Name
Port A Parity Generation
I/O
I
Description
Parity is generated for data reads from the mail2 register when PGA is HIGH. The type of parity
generated is selected by the state of the ODD/EVEN input. Bytes are organized at A
0
-A
8
, A
9
-A
17
,
A
18
-A
26
, and A
27
-A
35
. The generated parity bits are output in the most significant bit of each byte.
Parity is generated for data reads from port B when PGB is HIGH. The type of parity generated is
selected by the state of the ODD/EVEN input. Bytes are organized as B
0
-B
8
, B
9
-B
17
, B
18
-B
26
, and
B
27
-B
35
. The generated parity bits are output in the most significant bit of each byte.
To reset the device, four LOW-to-HIGH transitions of CLKA and four LOW-to-HIGH transitions of CLKB
must occur while
RST
is LOW. This sets the
AF, MBF1,
and
MBF2
flags HIGH and the
EF, AE,
and
FF
flags LOW. The LOW-to-HIGH transition of
RST
latches the status of the FS
1
and FS
0
inputs to select
Almost-Full flag and Almost-Empty flag offset.
A LOW-to-HIGH transition of CLKB latches the states of SIZ0, SIZ1, and
BE,
and the following LOW-to
HIGH transition of CLKB implements the latched states as a port B bus size. Port B bus sizes can be
long word, word, or byte. A HIGH on both SIZ0 and SIZ1 accesses the mailbox registers for a port B 36-bit
write or read.
At the beginning of each long word FIFO read, one of four modes of byte-order swapping is selected by
SW0 and SW1. The four modes are no swap, byte swap, word swap, and byte-word swap. Byte order
swapping is possible with any bus-size selection.
A HIGH selects a write operation and a LOW selects a read operation on port A for a LOW-to-HIGH
transition of CLKA. The A
0
-A
35
outputs are in the high-impedance state when W/RA is HIGH.
A HIGH selects a write operation and a LOW selects a read operation on port B for a LOW-to-HIGH
transition of CLKB. The B
0
-B
35
outputs are in the high-impedance state when W/RB is HIGH.
PGB
Port B Parity
I
RST
Reset
I
SIZ0,
SIZ1
Port B Bus Size Selects
I
(Port B)
SW0,
SW1
W/RA
W/RB
Port B Byte Swap Selects
I
(Port B)
I
I
Port A Write/Read Select
Select
Port B Write/Read Select
5
JUNE 14, 2005
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