RF3000 Просмотр технического описания (PDF) - RF Micro Devices

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RF3000

SPREAD-SPECTRUM BASEBAND MODEM

RF Micro Devices 

RF3000

SPI Control Port

The control port is used by the Media Access Controller (MAC) to set up and modify the multiple operation modes of the

RF3000. The port is set to SPI mode, with the RF3000 acting as Slave. Note that if no setup information is programmed

into the RF3000's registers, it will default to a BPSK 1Mbps IEEE802.11b DSSS mode. If an IEEE802.11b mode is

selected in Register 1, other waveform registers are ignored and the appropriate, standards compliant features are

enabled (e.g., PN code, preamble/header, etc.). TX length is required for all IEEE802.11b modes.

All Registers, as defined in the Register Definition section of this datasheet, can be read in real time through this control

port. Selected registers, as indicated in the Register section are read-only.

The control port of the RF3000 contains a mode to automatically increment the register pointer, allowing reading or writ-

ing of adjacent bytes without the need to stop and restart control port access.

SPI Mode Description

SPI mode pin definitions.

Pin Name

CS

C CLK

CD IN

CD OUT

Description

Serial port chip select. A value of '0' is port enabled.

Control port-bit clock input from serial port master.

Serial data input to the RF3000. Data is clocked in on the rising edge of C CLK.

Serial data output from the RF3000. Data is clocked out on the falling edge of C CLK.

SPI Method of Operation

Write:

To Write into a register of the RF3000, the accessing SPI master needs to simply bring CS low, then Address the

RF3000 (01000002) and provide a '0' for the Read/Write-bit. The user should note that all data transfers to/from the

RF3000 are msb first. This should be followed by the Auto-increment-bit and the Memory address pointer (MAP), this is

an 7-bit value to indicate the initial address for the write process. Register data is to immediately follow the MAP. If the

Auto-Increment-bit is set RF3000 will continue to write data 1 byte at a time into the address pointed to by the MAP, and

increment the MAP after each byte. When the SPI Master is finished filling registers, it must raise CS to indicate the cycle

end.

Read:

Reading the contents of the RF3000 internal registers, the procedure is actually a write process followed by the read.

The SPI Master must bring CS low, to prepare the RF3000 to look for its address. The SPI Master now addresses the

RF3000, by placing the RF3000 base address (01000002) on the data bus and append a '0' for the Read/Write-bit. The

SPI Master must now set the Auto-increment-bit and initialize the 7-bit MAP to the value of the register to be read. The

user should raise CS, to end the write portion of the cycle. To complete the Write/Read cycle the SPI Master now needs

to lower CS again, and readdress the RF3000 providing a '1' for the Read/Write-bit. Once this is completed the RF3000

will begin outputting the register contents. As long as the CS remains low, and the auto-increment bit is set, the RF3000

will auto-increment the MAP. When the RF3000 reaches Address 31, the MAP will be reset to Register 0 and the process

continues.

Rev A4 031216

11-329

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