EM77950 datasheet(64/102 Pages) EMC

64 / 102 page

EM77950

BB Controller

•

Product Specification (V1.0) 10.09.2007

(This specification is subject to change without further notice)

Bit 1:

SEARCH_EN

Preamble search enable bit.

When 1

: Enables the search for Preamble in receive mode.

When 0

: Disables the search for Preamble in receive mode, (used when user

configures the system while in default receive mode).

This bit’s default value is ‘0’. It must be set to ‘1’ in order to start receiving a

packet.

Bit 2:

RX_FIFO_RESET

This bit resets the RX_FIFO address pointers when set to Logic 1. This bit is

set by MCU and is cleared automatically by BB.

Bit 3:

TX_FIFO_RESET

This bit resets the TX_FIFO address pointers when set to Logic 1. This bit is

set by MCU and is cleared automatically by BB.

Bit 4:

STOP_RX

This bit stops receiving the current command, resets the RX_FIFO counters

and start new searches for preamble. This bit is set by MCU and is cleared

automatically by BB.

Bits 5-7:

PRE_MASK [0:2]

These bits determine the mask on PRE-H in preamble correlation. Meaning, it

determines the size of the Preamble in the receiver.

The PRE-L is always used in the Preamble correlation.

BB cuts off bit from PRE-H register, starting from the MSB.

PRE

MASK 0

PRE

MASK 1

PRE

MASK 2

Preamble Size

Default Value:

0x60

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