PCMCIA SRAM Memory Card
SRA Series
Card Signal Description
Symbol
A0 - A25
Type
INPUT
Name and Function
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)
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.
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.
DQ0 - DQ15
CE1#, CE2#
INPUT/OUT
PUT
INPUT
OE#
WE#
INPUT
INPUT
OUTPUT ENABLE: Active low signal enabling read data from the
memory card.
WRITE ENABLE: Active low signal gating write data to the memory
card.
RDY/BSY#
CD1#, CD2#
OUTPUT
OUTPUT
READY/BUSY OUTPUT: Not used for SRAM cards
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
N.C.
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.
PROGRAM/ERASE POWER SUPPLY: Not used for SRAM
cards.
VPP1, VPP2
VCC
GND
CARD POWER SUPPLY: 5.0V for all internal circuitry.
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
N.C.
RESERVED FOR FUTURE USE
NO INTERNAL CONNECTION TO CARD: pin may be driven
or left floating
FUNCTIONAL TRUTH TABLE
Common Memory
Attribute Memory
/REG D15-D8 D7-D0
High-Z
READ function
Function Mode
Standby Mode
Byte Access (8 bits)
/CE2 /CE1 A0
/OE /WE
/REG D15-D8
D7-D0
High-Z
H
H
H
L
H
L
L
X
L
H
X
X
X
L
L
L
L
X
H
H
H
H
X
H
H
H
H
High-Z
X
L
L
L
L
High-Z
High-Z Even-Byte
High-Z Odd-Byte
Odd-Byte Even-Byte
Odd-Byte High-Z
High-Z Even-Byte
High-Z Not Valid
Not Valid Even-Byte
Word Access (16 bits)
Odd-Byte Only Access
WRITE function
L
L
H
Not Valid
High-Z
Standby Mode
Byte Access (8 bits)
H
H
H
L
H
L
L
L
H
X
L
H
X
X
X
H
H
H
H
X
L
L
L
L
X
H
H
H
H
X
X
X
X
X
L
L
L
L
X
X
X
X
X
X
Even-Byte
Odd-Byte
Even-Byte
X
Even-Byte
X
Word Access (16 bits)
Odd-Byte Only Access
Odd-Byte Even-Byte
Odd-Byte
L
X
4
February 2002 Rev. 6
PC Card Products
5秒后页面跳转
MAX6675资料手册参数详解、引脚配置说明
LM258引脚图及功能介绍、主要参数分析
CD4052资料手册参数详解、引脚配置说明
一文带你了解TPS5430资料手册分析：参数介绍、引脚配置说明
微信公众号
抖音公众号
浙公网安备 33010502006866号 浙ICP备10014259号-119
营业执照ICP证
数据手册
如果您发现信息不准确，
