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參數(shù)資料
| 型號(hào)： | 8P002SRA0205I15 |
| 廠商： | WHITE ELECTRONIC DESIGNS CORP |
| 元件分類： | SRAM |
| 英文描述： | 1M X 16 MULTI DEVICE SRAM CARD, 150 ns, XMA68 |
| 封裝： | CARD2-68 |
| 文件頁數(shù)： | 5/10頁 |
| 文件大?。?/td> | 111K |
| 代理商： | 8P002SRA0205I15 |
February 2002 Rev. 6
4
PCMCIA SRAM Memory Card
SRA Series
PC Card Products
Symbol
Type
Name and Function
A0 - A25
INPUT
ADDRESS INPUTS: A0 through A25 enable direct addressing of up
to 64MB of memory on the card. Signal A0 is not used in word access
mode. A25 is the most significant bit. (address pins used are based on
card density,see pinout for highest used address pin)
DQ0 - DQ15
INPUT/OUT
PUT
DATA INPUT/OUTPUT: DQ0 THROUGH DQ15 constitute the
bi-directional databus. DQ0 - DQ7 constitute the lower (even) byte and
DQ8 - DQ15 the upper (odd) byte. DQ15 is the MSB.
CE1#, CE2#
INPUT
CARD ENABLE 1 AND 2: CE1# enables even byte accesses, CE2#
enables odd byte accesses. Multiplexing A0, CE1# and CE2# allows 8-
bit hosts to access all data on DQ0 - DQ7.
OE#
INPUT
OUTPUT ENABLE: Active low signal enabling read data from the
memory card.
WE#
INPUT
WRITE ENABLE: Active low signal gating write data to the memory
card.
RDY/BSY#
OUTPUT
READY/BUSY OUTPUT: Not used for SRAM cards
CD1#, CD2#
OUTPUT
CARD DETECT 1 and 2: Provide card insertion detection. These
signals are connected to ground internally on the memory card. The
host socket interface circuitry shall supply 10K-ohm or larger pull-up
resistors on these signal pins.
WP
OUTPUT
WRITE PROTECT: Follows hardware Write Protect Switch. When
Switch is placed in on position, signal is pulled high (10K ohm). When
switch is off signal is pulled low.
VPP1, VPP2
N.C.
PROGRAM/ERASE POWER SUPPLY: Not used for SRAM
cards.
VCC
CARD POWER SUPPLY: 5.0V for all internal circuitry.
GND
GROUND: for all internal circuitry.
REG#
INPUT
ATTRIBUTE MEMORY SELECT : only used with cards built with
optional attribute memory.
RST
INPUT
RESET: Not used for SRAM cards
WAIT#
OUTPUT
WAIT: This signal is pulled high internally for compatibility. No wait
states are generated.
BVD1, BVD2
OUTPUT
BATTERY VOLTAGE DETECT: Provides status of Battery
voltage.
BVD2 = BVD1 = Voh (battery voltage is guaranteed to retain data)
BVD2 = Vol, BVD1 = Voh (data is valid, battery recharge required)
BVD2 = BVD1 = Vol (data may no longer be valid, battery requires
extended recharge)
VS1, VS2
OUTPUT
VOLTAGE SENSE: Notifies the host socket of the card's VCC
requirements. VS1 and VS2 are open to indicate a 5V, 16 bit card has
been inserted.
RFU
RESERVED FOR FUTURE USE
N.C.
NO INTERNAL CONNECTION TO CARD: pin may be driven
or left floating
Card Signal Description
FUNCTIONAL TRUTH TABLE
READ function
Common Memory
Attribute Memory
Function Mode
/CE2 /CE1
A0
/OE
/WE
/REG
D15-D8
D7-D0
/REG
D15-D8
D7-D0
Standby Mode
H
X
High-Z
X
High-Z
Byte Access (8 bits)
H
L
H
High-Z
Even-Byte
L
High-Z
Even-Byte
H
L
H
L
H
High-Z
Odd-Byte
L
High-Z
Not Valid
Word Access (16 bits)
L
X
L
H
Odd-Byte Even-Byte
L
Not Valid Even-Byte
Odd-Byte Only Access
L
H
X
L
H
Odd-Byte
High-Z
L
Not Valid
High-Z
WRITE function
Standby Mode
H
X
Byte Access (8 bits)
H
L
H
L
H
X
Even-Byte
L
X
Even-Byte
H
L
H
L
H
X
Odd-Byte
L
X
Word Access (16 bits)
L
X
H
L
H
Odd-Byte Even-Byte
L
X
Even-Byte
Odd-Byte Only Access
L
H
X
H
L
H
Odd-Byte
X
L
X
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