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DS21Q55

HDLC CONTROLLER REGISTERS Table 24-1

NAME

FUNCTION

CONTROL/CONFIGURATION

H1TC, HDLC #1 Transmit Control Register

General control over the transmit HDLC controllers

H2TC, HDLC #2 Transmit Control Register

 

H1RC, HDLC #1 Receive Control Register

General control over the receive HDLC controllers

H2RC, HDLC #2 Receive Control Register

 

H1FC, HDLC #1 FIFO Control Register

Sets high watermark for receiver and low watermark for

H2FC, HDLC #2 FIFO Control Register

transmitter

STATUS/INFORMATION

SR6, HDLC #1 Status Register

Key status information for both transmit and receive directions

SR7, HDLC #2 Status Register

 

IMR6, HDLC #1 Interrupt Mask Register

Selects which bits in Status Registers (SR7 and SR8) will cause

IMR7, HDLC #2 Interrupt Mask Register

interrupts

INFO4, HDLC #1 & #2 Information Register

Information on HDLC controller

INFO5, HDLC #1 Information Register

 

INFO6, HDLC #2 Information Register

 

H1RPBA, HDLC #1 Receive Packet Bytes Available

Indicates the number of bytes that can be read from the receive

Register

FIFO

H2RPBA, HDLC #2 Receive Packet Bytes Available

 

Register

 

H1TFBA, HDLC #1 Transmit FIFO Buffer Available

Indicates the number of bytes that can be written to the transmit

Register

FIFO

H2TFBA, HDLC #2 Transmit FIFO Buffer Available

 

Register

 

MAPPING

 

H1RCS1, H1RCS2, H1RCS3, H1RCS4, HDLC #1

Selects which channels will be mapped to the receive HDLC

Receive Channel Select Registers

controller

H2RCS1, H2RCS2, H2RCS3, H2RCS4, HDLC #2

 

Receive Channel Select Registers

 

H1RTSBS, HDLC #1 Receive TS/Sa Bit Select

Selects which bits in a channel will be used or which Sa bits will

Register

be used by the receive HDLC controller

H2RTSBS, HDLC #2 Receive TS/Sa Bit Select

 

Register

 

H1TCS1, H1TCS2, H1TCS3, H1TCS4, HDLC #1

Selects which channels will be mapped to the transmit HDLC

Transmit Channel Select Registers

controller

H2TCS1, H2TCS2, H2TCS3, H2TCS4, HDLC #2

 

Transmit Channel Select Registers

 

H1TTSBS, HDLC # 1 Transmit TS/Sa Bit Select

Selects which bits in a channel will be used or which Sa bits will

Register

be used by the transmit HDLC controller

H2TTSBS, HDLC # 2 Transmit TS/Sa Bit Select

 

Register

 

FIFOs

 

H1RF, HDLC #1 Receive FIFO Register

Access to 128-byte receive FIFO

H2RF, HDLC #2 Receive FIFO Register

 

H1TF, HDLC #1 Transmit FIFO Register

Access to 128-byte transmit FIFO

H2TF, HDLC #2 Transmit FIFO Register

 

 

 

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Maxim DS21Q55 specifications Hdlc Controller Registers Table