EM77950 datasheet(68/102 Pages) EMC

68 / 102 page

EM77950

BB Controller

•

Product Specification (V1.0) 10.09.2007

(This specification is subject to change without further notice)

Bits 4-5:

SIZE_LOC [0:2]

These bits determine the location of the Packet Size parameter in the header

(the location is specified in bytes excluding the Preamble). The location should

be fixed for all the different kinds of packets transferred by the system.

Location

SIZE LOC 2

SIZE LOC 1

SIZE LOC 0

Default Value:

0x00

8.3.12

Node Identity Register (BIR)

This is a read and a write register.

When the Receiver State Machine builds the incoming packet, it compares the value in

the BIR register to the received data at the location specified in LCR.

If received NODE_ID and the expected NODE_ID are not equal, the packet is

discarded.

Four multicast NODE_ID addresses are implemented “111111XX”. All packets whose

6 MSBs are “1” are not discarded.

Default Value:

0x00

8.3.13

Net Identity Register (NIR)

This is a read and a write register.

When the Receiver State Machine builds the incoming packet, it compares the value in

the NIR to the received data at the location specified in LCR.

If received NET_ID and the expected NET_ID are not equal, the packet is discarded.

Default Value:

0x00

EM77950 Datasheet(PDF) 68 Page - ELAN Microelectronics Corp