Owner's manual
DS21455/DS21458 Quad T1/E1/J1 Transceivers
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6. PARALLEL PORT
The transceiver is controlled via either a nonmultiplexed (MUX = 0) or a multiplexed (MUX = 1) bus by
an external microcontroller or microprocessor. The transceiver can operate with either Intel or Motorola
bus timing configurations. If the BTS pin is tied low, Intel timing will be selected; if tied high, Motorola
timing will be selected. All Motorola bus signals are listed in parentheses (). See the timing diagrams in
the AC Electrical Characteristics for more details.
6.1 Register Map
Table 6-1. REGISTER MAP SORTED BY ADDRESS
ADDRESS REGISTER NAME
REGISTER
ABBREVIATION
PAGE
00 Master Mode Register MSTRREG 49
01 I/O Configuration Register 1 IOCR1 78
02 I/O Configuration Register 2 IOCR2 79
03 T1 Receive Control Register 1 T1RCR1 53
04 T1 Receive Control Register 2 T1RCR2 53
05 T1 Transmit Control Register 1 T1TCR1 55
06 T1 Transmit Control Register 2 T1TCR2 56
07 T1 Common Control Register 1 T1CCR1 57
08 Software Signaling Insertion Enable 1 SSIE1 104
09 Software Signaling Insertion Enable 2 SSIE2 104
0A Software Signaling Insertion Enable 3 SSIE3 105
0B Software Signaling Insertion Enable 4 SSIE4 105
0C T1 Receive Digital Milliwatt Enable Register 1 T1RDMR1 61
0D T1 Receive Digital Milliwatt Enable Register 2 T1RDMR2 61
0E T1 Receive Digital Milliwatt Enable Register 3 T1RDMR3 61
0F Device Identification Register IDR 72
10 Information Register 1 INFO1 62
11 Information Register 2 INFO2 170
12 Information Register 3 INFO3 69
13 — — —
14 Interrupt Information Register 1 IIR1 51
15 Interrupt Information Register 2 IIR2 51
16 Status Register 1 SR1 171
17 Interrupt Mask Register 1 IMR1 172
18 Status Register 2 SR2 72
19 Interrupt Mask Register 2 IMR2 73
1A Status Register 3 SR3 74
1B Interrupt Mask Register 3 IMR3 75
1C Status Register 4 SR4 76
1D Interrupt Mask Register 4 IMR4 77
1E Status Register 5 SR5 118
1F Interrupt Mask Register 5 IMR5 118
20 Status Register 6 SR6 150
21 Interrupt Mask Register 6 IMR6 151
22 Status Register 7 SR7 150
23 Interrupt Mask Register 7 IMR7 151
24 Status Register 8 SR8 125
25 Interrupt Mask Register 8 IMR8 126
26 Status Register 9 SR9 190
27 Interrupt Mask Register 9 IMR9 191
28 Per-Channel Pointer Register PCPR 46
29 Per-Channel Data Register 1 PCDR1 47