MT9072AB datasheet(148/275 Pages) ZARLINK

148 / 275 page

MT9072

Data Sheet

148

Zarlink Semiconductor Inc.

Bit

Name

Functional Description

15-9

ADM26

ADM20

(0000000)

Address Mask 26 to Address Mask 20. A seven bit mask used to interrogate the second

byte of the received address. Adr26 is the MSB. This mask is ignored (as well as first byte

mask) if all call address (1111111) is received.

8A2EN

(0)

Address 2 Enable. When this bit is high, this seven bit mask is used in address

comparison of the second address byte. If address recognition is enabled, any packet

failing the address comparison will not be stored in the RX FIFO. A2en must be high for

All-call address recognition. When this bit is low, this bit mask is ignored in address

comparison

7 - 2

ADRM16

ADRM11

(000000)

Address Mask 16 to Address Mask 11.A six bit mask used to interrogate the first byte of

the received address. AdrM16 is MSB.

ADRM10

(0)

Address 10 Mask.This bit is used in address comparison if a seven bit address is being

checked for (YF2 bit ’Seven’ is set).

0A1EN

(0)

Address 1 Enable.When this bit is high, this six (or seven) bit mask is used in address

comparison of the first address byte.

If address recognition is enabled, any packet failing the address comparison will not be

stored in the RX FIFO. A1en must be high for All-call (1111111) address recognition for

single byte address. When this bit is low, this bit mask is ignored in address comparison.

Table 115 - Address Recognition Register(YF4) (T1)

Bit

Name

Functional Description

15-8

not used.

7 - 0

BIT7-0

(00000000)

This eight bit word is tagged with the two status bits from control register 1 (EOP and FA),

and the resulting 10 bit word is written to the TX FIFO. The FIFO status is not changed

immediately after a write or read occurs. It is updated after the data has settled and the

transfer to the last available position has finished. Note that when the HDLC is connected

to a T1 channel, the least significant bit in the FIFO

is sent first.

Table 116 - TX Fifo Write Register(YF5) (T1)

Bit

Name

Functional Description

15-8

not used.

7-0

CNT7-0

(00000000)

The Transmit Byte Count Register indicating the length of the data portion of the packet

about to be transmitted. This is the size of the data and not the address, flags or FCS. The

Transmit Byte Counter position Y1C determines the number of bytes that have been sent

from the Transmit FIFO.

Table 117 - TX Byte Count Register(YF6) (T1)

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