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CYDMX128B16 Datasheet(PDF) 6 Page - Cypress Semiconductor

Part # CYDMX128B16
Description  16 K/8 K/4 K x 16 MoBL ADM 16 K/8 K/4 K x 16 MoBL ADM High speed access
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Manufacturer  CYPRESS [Cypress Semiconductor]
Direct Link  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

CYDMX128B16 Datasheet(HTML) 6 Page - Cypress Semiconductor

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CYDMX256A16, CYDMX256B16
CYDMX128A16, CYDMX128B16
CYDMX064A16, CYDMX064B16
Document #: 001-08090 Rev. *G
Page 6 of 25
Architecture
The
CYDMX256A16,
CYDMX128A16,
CYDMX064A16,
CYDMX256B16, CYDMX128B16, and CYDMX064B16 consist
of an array of 16K, 8K, and 4K words of 16 dual-ported SRAM
cells, IO, address lines, and control signals (CS#, ADV#, OE#,
and WE#). Between the two access ports, one is a dedicated
time multiplexed address and data interface; the other is a pin
selectable port to either standard SRAM or time multiplexed
address and data interface. Independent control signals for each
port permit simultaneous access to any location in memory. To
handle the situation of writing and reading to the same location,
a BUSY# pin is provided on each port. For port to port
communication, an Interrupt (INT#) pin is also available on each
port.
Table 1. ADM Interface Read/Write with Byte Select Operations
ADV#
CS#
WE#
OE#
UB#
LB#
IO0 - IO15
Mode
X
H
X
X
X
X
High Z
Deselected or power down
X
X
X
H
X
X
High Z
Output disable
XXXX
H
H
High Z
Upper and lower byte
deselected
Pulse
L
H
L
L
L
Data Out (IO0-IO15)
Read upper and lower bytes
Pulse
L
H
L
H
L
Data Out (IO0-IO7)
High Z (IO8-IO15)
Read lower byte only
Pulse
L
H
L
L
H
High Z (IO0-IO7)
Data Out (IO8-IO15)
Read upper byte only
Pulse
L
L
X
L
L
Data In (IO0-IO15)
Write upper and lower bytes
Pulse
L
L
X
H
L
Data In (IO0-IO7)
High Z (IO8-IO15)
Write lower byte only
Pulse
L
L
X
L
H
High Z (IO0-IO7)
Data In (IO8-IO15)
Write upper byte only
Table 2. Standard SRAM Interface Read/Write with Byte Select Operations
CS#
WE#
OE#
UB#
LB#
IO0-IO15
Mode
H
X
X
X
X
High Z
Deselected or power down
X
X
H
X
X
High Z
Output disable
X
X
X
H
H
High Z
Upper and lower byte deselected
L
H
L
L
L
Data Out (IO0-IO15)
Read upper and lower bytes
L
H
L
H
L
Data Out (IO0-IO7)
High Z (IO8-IO15)
Read lower byte only
L
H
L
L
H
High Z (IO0-IO7)
Data Out (IO8-IO15)
Read upper byte only
L
L
X
L
L
Data In (IO0-IO15)
Write upper and lower bytes
L
L
X
H
L
Data In (IO0-IO7)
High Z (IO8-IO15)
Write lower byte only
L
L
X
L
H
High Z (IO0-IO7)
Data In (IO8-IO15)
Write upper byte only
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