HT82K75REW datasheet(48/103 Pages) HOLTEK

48 / 103 page

HT82M75REW/HT82K75REW

Rev. 1.00

June 11, 2010

RF Transceiver Low MAC Block

The RF Transceiver MAC provides plenty of hard-

ware-assisted features to relieve the host MCU power

requirement. Besides providing reliable wireless packet

transactions between two nodes, it also handles data

and command transfer between the network and the

physical layers PHY.

MAC Frame Format

· Data Frame

The address field contains the broadcast address

(0xFFFF-FFFFH) or destination address. The bit 0 of

frame control (FC) field is used for Ack-Request which

specifies whether an acknowledgement is required

from the recipient device. If the bit is

²1², the recipient

device shall send an acknowledgement frame back

after determining that the received frame is valid. The

bit 1 of FC field is

²0² for data frame. The length of

payload field is variable from 0 to 56 bytes. The frame

check sequence (FCS) is calculated over the address

field, FC field and the payload. The polynomial is de-

gree 16:

· Acknowledgement Frame

The length of acknowledgement frame is always 5

bytes. Bit 1 of FC field is 1 for ACK frame. The payload

field, containing user information of acknowledge-

ment frame, can be configured by SREG0x03 and

SREG0x04. The FCS is calculated over the FCS of

the received packet, FC field and the payload field.

The polynomial is degree 16:

Data Frame

Acknowledgement Frame

( x ) = x

+ x

+ x + 1

1 6

1 2

( x ) = x

+ x

+ x + 1

1 6

1 2

P H Y

L o w e r M A C

R X M A C

T X M A C

M e m o r y

I n t e r f a c i n g

Lower MAC Block Diagram

HT82K75REW Datasheet(PDF) 48 Page - Holtek Semiconductor Inc

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