XRT86VL34 datasheet(37/156 Pages) EXAR

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XRT86VL34

REV. V1.2.0

QUAD T1/E1/J1 FRAMER/LIU COMBO - T1 REGISTER DESCRIPTION

TABLE 17: TRANSMIT DATA LINK BYTE COUNT REGISTER (TDLBCR1)

HEX ADDRESS: 0Xn114

BIT

FUNCTION

TYPE

DEFAULT

DESCRIPTION-OPERATION

TxHDLC1 BUFAvail/

BUFSel

R/W

Transmit HDLC1 Buffer Available/Buffer Select

This bit has different functions, depending upon whether the user is

writing to or reading from this register, as depicted below.

If the user is writing data into this register bit:

0 - Configures the Transmit HDLC1 Controller to read out and trans-

mit the data, residing within “Transmit HDLC1 Buffer # 0", via the

Data Link channel to the remote terminal equipment.

1 - Configures the Transmit HDLC1 Controller to read out and trans-

mit the data, residing within the “Transmit HDLC1 Buffer #1”, via the

Data Link channel to the remote terminal equipment.

If the user is reading data from this register bit:

0 - Indicates that “Transmit HDLC1 Buffer # 0" is the next available

buffer. In this case, if the user wishes to write in the contents of a

new “outbound” Data Link Message into the Transmit HDLC1 Mes-

sage Buffer, he/she should proceed to write this message into

“Transmit HDLC1 Buffer # 0" - Address location: 0xn600.

1 - Indicates that “Transmit HDLC1 Buffer # 1" is the next available

buffer. In this case, if the user wishes to write in the contents of a

new “outbound” Data Link Message into the Transmit HDLC1 Mes-

sage Buffer, he/she should proceed to write this message into

“Transmit HDLC1 Buffer # 1" - Address location: 0xn700.

NOTE: If one of these Transmit HDLC1 buffers contain a message

which has yet to be completely read-in and processed for

transmission by the Transmit HDLC1 controller, then this bit

will automatically reflect the value corresponding to the next

available buffer when it is read. Changing this bit to the in-

use buffer is not permitted.

6-0

TDLBC[6:0]

R/W

0000000

Transmit HDLC1 Message - Byte Count

The exact function of these bits depends on whether the Transmit

HDLC 1 Controller is configured to transmit MOS or BOS messages

to the Remote Terminal Equipment.

In BOS MODE:

These bit fields contain the number of repetitions the BOS message

must be transmitted before the Transmit HDLC1 controller gener-

ates the Transmit End of Transfer (TxEOT) interrupt and halts trans-

mission. If these fields are set to 00000000, then the BOS message

will be transmitted for an indefinite number of times.

In MOS MODE:

These bit fields contain the length, in number of octets, of the mes-

sage to be transmitted. The length of MOS message specified in

these bits include header bytes such as the SAPI, TEI, Control field,

however, it does not include the FCS bytes.

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