DS2155 datasheet(133/262 Pages) DALLAS

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DS2156

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Table 22-A. HDLC Controller Registers

FUNCTION

CONTROL AND CONFIGURATION

H1TC, HDLC #1 Transmit Control Register

H2TC, HDLC #2 Transmit Control Register

General control over the transmit HDLC

controllers

H1RC, HDLC #1 Receive Control Register

H2RC, HDLC #2 Receive Control Register

General control over the receive HDLC

controllers

H1FC, HDLC #1 FIFO Control Register

H2FC, HDLC #2 FIFO Control Register

Sets high watermark for receiver and low

watermark for transmitter

STATUS AND INFORMATION

SR6, HDLC #1 Status Register

SR7, HDLC #2 Status Register

Key status information for both transmit and

receive directions

IMR6, HDLC #1 Interrupt Mask Register

IMR7, HDLC #2 Interrupt Mask Register

Selects which bits in the status registers (SR7

and SR8) cause interrupts

INFO4, HDLC #1 and #2 Information Register

INFO5, HDLC #1 Information Register

INFO6, HDLC #2 Information Register

Information about HDLC controller

H1RPBA, HDLC #1 Receive Packet Bytes

Available Register

H2RPBA, HDLC #2 Receive Packet Bytes

Available Register

Indicates the number of bytes that can be read

from the receive FIFO

H1TFBA, HDLC #1 Transmit FIFO Buffer

Available Register

H2TFBA, HDLC #2 Transmit FIFO Buffer

Available Register

Indicates the number of bytes that can be

written to the transmit FIFO

MAPPING

H1RCS1, H1RCS2, H1RCS3, H1RCS4, HDLC

#1 Receive Channel Select Registers

H2RCS1, H2RCS2, H2RCS3, H2RCS4, HDLC

#2 Receive Channel Select Registers

Selects which channels are mapped to the

receive HDLC controller

H1RTSBS, HDLC #1 Receive TS/Sa Bit Select

H2RTSBS, HDLC #2 Receive TS/Sa Bit Select

Selects which bits in a channel are used or

which Sa bits are used by the receive HDLC

controller

H1TCS1, H1TCS2, H1TCS3, H1TCS4, HDLC

#1 Transmit Channel Select Registers

H2TCS1, H2TCS2, H2TCS3, H2TCS4, HDLC

#2 Transmit Channel Select Registers

Selects which channels are mapped to the

transmit HDLC controller

H1TTSBS, HDLC # 1 Transmit TS/Sa Bit Select

H2TTSBS, HDLC # 2 Transmit TS/Sa Bit Select

Selects which bits in a channel are used or

which Sa bits are used by the transmit HDLC

controller

FIFOs

H1RF, HDLC #1 Receive FIFO Register

H2RF, HDLC #1 Receive FIFO Register

Access to 128-byte receive FIFO

H1TF, HDLC #1 Transmit FIFO Register

H2TF, HDLC #2 Transmit FIFO Register

Access to 128-byte transmit FIFO

DS2155 Datasheet(PDF) 133 Page - Dallas Semiconductor

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