DS2151 Dallas Semiconducotr, DS2151 Datasheet - Page 7

• Manufacturer Part Number: DS2151
• Description: T1 Single-Chip Transceiver
• Manufacturer: Dallas Semiconducotr

DS2151Q REGISTER MAP (continued)
NOTES:
1. Address 25 also contains Multiframe Out of Sync Count Register 1.
2. The Test Register is used only by the factory; this register must be cleared (set to all 0s) on power-up
2.0
The DS2151Q is controlled via a multiplexed bidirectional address/data bus by an external
microcontroller or microprocessor. The DS2151Q 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 parenthesis (). See the timing diagrams in the A.C.
Electrical Characteristics for more details. The multiplexed bus on the DS2151Q saves pins because the
address information and data information share the same signal paths. The addresses are presented to the
pins in the first portion of the bus cycle and data will be transferred on the pins during second portion of
the bus cycle. Addresses must be valid prior to the falling edge of ALE (AS), at which time the
initialization to insure proper operation.
6C
6D
6A
6B
6E
6F
63
64
65
66
67
68
69
PARALLEL PORT
R/W
R/W
R/W
R/W
R
R
R
R
R
R
R
R
R
Receive Signaling Register 4.
Receive Signaling Register 5.
Receive Signaling Register 6.
Receive Signaling Register 7.
Receive Signaling Register 8.
Receive Signaling Register 9.
Receive Signaling Register 10.
Receive Signaling Register 11.
Receive Signaling Register 12.
Receive Channel Blocking
Register 1.
Receive Channel Blocking
Register 2.
Receive Channel Blocking
Register 3.
Interrupt Mask Register 2.
7 of 51
7C
7D
7A
7B
7E
7F
73
74
75
76
77
78
79
R/W Transmit Signaling Register 4.
R/W Transmit Signaling Register 5.
R/W Transmit Signaling Register 6.
R/W Transmit Signaling Register 7.
R/W Transmit Signaling Register 8.
R/W Transmit Signaling Register 9.
R/W Transmit Signaling Register 10.
R/W Transmit Signaling Register 11.
R/W Transmit Signaling Register 12.
R/W Line Interface Control Register.
R/W Test Register. (2)
R/W Transmit FDL Register.
R/W Interrupt Mask Register 1.
DS2151Q