Datasheet

DS21354/DS21554 3.3V/5V E1 Single-Chip Transceivers
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ADDRESS TYPE REGISTER NAME
B5 R/W Interleave Bus Operation Register IBO
B6 R/W Transmit HDLC Information Register THIR
B7 R/W Transmit HDLC FIFO Register THFR
B8 R/W Receive HDLC DS0 Control Register 1 RDC1
B9 R/W Receive HDLC DS0 Control Register 2 RDC2
BA R/W Transmit HDLC DS0 Control Register 1 TDC1
BB R/W Transmit HDLC DS0 Control Register 2 TDC2
BC — Not used (set to 00h)
BD — Not used (set to 00h)
BE — Not used (set to 00h)
BF — Not used (set to 00h)
Note 1:
Test Registers are used only by the factory. These registers must be cleared (set to all zeros) on power-up initialization to ensure
proper operation.
Note 2:
Register banks Cxh, Dxh, Exh, and Fxh are not accessible.