CY7C026A-15AC(2000) データシートの表示（PDF） - Cypress Semiconductor
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CY7C026A-15AC Datasheet PDF : 17 Pages
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CY7C026A
CY7C036A
Functional Description
The CY7C026A and CY7C036A are low-power CMOS 16K x
16/18 dual-port static RAMs. Various arbitration schemes are
included on the devices to handle situations when multiple pro-
cessors access the same piece of data. Two ports are provid-
ed, permitting independent, asynchronous access for reads
and writes to any location in memory. The devices can be uti-
lized as standalone 16/18-bit dual-port static RAMs or multiple
devices can be combined in order to function as a 32/36-bit or
wider master/slave dual-port static RAM. An M/S pin is provid-
ed for implementing 32/36-bit or wider memory applications
without the need for separate master and slave devices or ad-
ditional discrete logic. Application areas include interproces-
sor/multiprocessor designs, communications status buffering,
and dual-port video/graphics memory.
Each port has independent control pins: Chip Enable (CE),
Read or Write Enable (R/W), and Output Enable (OE). Two
flags are provided on each port (BUSY and INT). BUSY sig-
nals that the port is trying to access the same location currently
being accessed by the other port. The Interrupt flag (INT) per-
mits communication between ports or systems by means of a
mail box. The semaphores are used to pass a flag, or token,
from one port to the other to indicate that a shared resource is
in use. The semaphore logic is comprised of eight shared
latches. Only one side can control the latch (semaphore) at
any time. Control of a semaphore indicates that a shared re-
source is in use. An automatic power-down feature is con-
trolled independently on each port by the chip enable pin.
The CY7C026A and CY7C036A are available in 100-pin Thin
Quad Plastic Flatpack (TQFP) packages.
Pin Configurations
100-Pin TQFP (Top View)
NC
NC
NC
NC
I/O10L
I/O11L
I/O12L
I/O13L
GND
I/O14L
I/O15L
VCC
GND
I/O0R
I/O1R
I/O2R
VCC
I/O3R
I/O4R
I/O5R
I/O6R
NC
NC
NC
NC
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
1
75
2
74
3
73
4
72
5
71
6
70
7
69
8
68
9
67
10
66
11
65
12
64
13
CY7C026A (16K x 16)
63
14
62
15
61
16
60
17
59
18
58
19
57
20
56
21
55
22
54
23
53
24
52
25
51
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
NC
NC
NC
A6L
A5L
A4L
A3L
A2L
A1L
A0L
INTL
BUSYL
GND
M/S
BUSYR
INTR
A0R
A1R
A2R
A3R
A4R
A5R
NC
NC
NC
2
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