MSM7712 Просмотр технического описания (PDF) - Oki Electric Industry

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MSM7712

Wireless LAN Baseband Controller

Oki Electric Industry 

–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––– s MSM7712 s

General Signals

General Signal Descriptions

Pin Name

SCK

VCSS, VPSS

VCDD

VPDD

Direction

Input

Power

Power

Power

Description

The system clock to the MSM7712 is provided by this pin. The clock must always be active (i.e. when reset is

asserted). The WLAN card operates synchronously to this clock.

The MSM7712 and radio operate at SCK/2. The internal modem operates at SCK (32 MHz).

The processor operates from a division of SCK (divide by 1 to divide by 8) depending on a register

(GLOB_CTL, see Programmers Reference) in the MSM7712. This signal is output as PCK.

These pins serve as ground for the core logic and I/O pads.

This pin serves as power to the core at 3-V nominal.

These pins serve as power to I/O pads and can either be 3-V or 5-V nominal.

Test

TEST mode is activated when HRST and PST2 are both active low (an illegal state) in normal operation.

The MSM7712 operates normally when TEST is not asserted. When asserted, the following test modes

are selected using processor data pins PD[1:0].

Test Select Options

PD[1] PD[0]

0

0

0

1

1

0

1

1

Test

Scan

Hi-Z

PinConn

Reserved

Description

Internal manufacturing scan test providing greater than 95% fault coverage. The scan select pin is PST0.

All output pins are set to high impedance. This test allows external tester to drive MSM7712GS-K pins.

All bidirectional, 3-state (except processor) and output pins are set to output and input pins determine state

of output pins. This test ensures connectivity of the MSM7712G-K to the PCB

MODEM SPECIFICATION

The following two subsections describe modulator and demodulator specifications.

Modulator

The MSM7712 features an internal digital 24 MHz IF CP-FSK modulator. There are two modes of modu-

lator operation:

• 1 Mbit/s, 2-ary CP-FSK

• 2 Mbit/s, 4-ary CP-FSK

Deviations can be set independently for both modes. Modes switch phase continuously in a single clock

cycle.

• 1 Mbit deviation: 1MDEV = N x 326 /4096 Hz

• 2 Mbit deviation: 2MDEV = N x 3 x 326/4096 Hz

where N=0.63.

Digital on/off ramping from 0 ~ 24 µs of the modulator output power may be added under register con-

trol

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