EM77950 datasheet(70/102 Pages) EMC

70 / 102 page

EM77950

BB Controller

•

Product Specification (V1.0) 10.09.2007

(This specification is subject to change without further notice)

Bit 4:

LOCK

This signals whether a Preamble was identified or is still searching.

When the flag is “0”, the receiver is searching for Preamble.

When the flag is “1” a Preamble was identified. If a packet was discarded for

any reason, the LOCK flag goes to 1.

Bit 5:

BIT_ERROR

This flag indicate that there was some error in the received package. The

packet was not received according the expected timing specifications.

The packet can still pass CRC verification.

Bit 6:

TX_UF

This flag is set whenever the MCU reads a byte from an empty TX_FIFO.

This flag indicates abnormal end of packet transmission. The MCU

transmitter’s state machine has expected to find a valid byte in the TX_FIFO

according to the packet size, but it found an empty TX_FIFO. When this event

occurs, the TX_EMPTY interrupt is invoked and TX_UF (underflow) flag is set

to ‘1’.

This flag is set by hardware and cleaned by MCU. It is cleaned whenever the

MCU read the SSR register.

Default Value:

0x04.

8.3.15

Packet Size Register (PSR)

This is a read and a write register.

It contains the Packet Size in byte units. When working in fixed size packets (see

Control Bit-1), the size will be fixed for all types of packets.

The size in PSR excludes 2 bytes of Preamble and 2, 1 or 0 bytes of CRC.

Default Value:

0x00.

8.3.16

Carrier Sense Register (CSR)

This is both a read and a write register.

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

CSR

ZERO

CNT.3

ZERO

CNT.2

ZERO

CNT.1

ZERO

CNT.0

ONE

CNT.3

ONE

CNT.2

ONE

CNT.1

ONE

CNT.0

Bits 0-3:

ONE_CNT [0:3]

The number of successive “1” bits that set the carrier sense high.

Bits 4-7:

ZERO_CNT [0:3]

The number of successive “0” bits that reset the carrier sense (CS=’0’).

Default Value:

0x44

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