MSM7712 データシートの表示（PDF） - Oki Electric Industry
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MSM7712 Datasheet PDF : 20 Pages
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E2PROM Interface
E2PROM support is provided to allow for non-volatile storage of the host interface configuration (e.g.
PCMCIA CIS table) and wireless LAN parameters (e.g. local IEEE address, radio parameters). The design
supports a 64, 128 or 256 byte E2PROM (e.g. 93C46,93C56, or 93C66 types).
MSM7712
EECS
SYNCLK/EESK
SYNDAT/EEDIO
V
CS
V
SK 93c46
DI 93c58
DO 94s66 V
Figure 3. E2PROM Connections to MSM7712GS-K
The local processor can access the E2PROM for reads, writes and control functions. This is used to initial-
ize the E2PROM and provide card parameter storage.
Following a reset by the host processor, the 64 or 128 bytes of E2PROM contents are automatically read to
shared RAM to provide the configuration information for the host interface.
E2PROM Interface Signal Descriptions
Pin Name
EEDIO
EECS
EESK
Direction
Bidirectional
Output
Output
Description
This is a bidirectional data signal for the E2PROM. It is connected directly to DI of the E2PROM, and to DO via
a resistor (see E2PROM application notes and Figure 3).
This signal is connected to CS of the E2PROM to provide the chip select.
This signal is connected to SK of the E2PROM to provide the clock. The clock rate is RCK divided by 64 (250
kHz with RCK at 16 MHz).
Host Interface (Between Adapter Card and Computer or Laptop)
The 16-bit PCMCIA interface is fully supported by the MSM7712 with no additional logic. Access to
attribute memory (the CIS configuration data) and I/O memory (host registers) are provided.
In normal operation, access to the baseband controller registers and shared buffer memory is via a small
number of I/O addresses. This requires minimum support in memory and input/output from the host
computer.
The signals are defined in the PCMCIA standard. Note that the PCMCIA bus timing is independent of
the system clock timing.
PCMCIA Interface
MSM7712GS-K
H_CONF
HA[8:0]
HD[15:0]
HWEN
HOEN
HIORDN
Pin Type
Input
Bidirectional
Input
Input
Input
PCMCIA
0
A[8:0]
D[15:0]
WEN
OEN
IORDN
8
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